EP2241644B1 - Alliages d'aluminium L12 traitables thermiquement - Google Patents

Alliages d'aluminium L12 traitables thermiquement Download PDF

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EP2241644B1
EP2241644B1 EP10250673.0A EP10250673A EP2241644B1 EP 2241644 B1 EP2241644 B1 EP 2241644B1 EP 10250673 A EP10250673 A EP 10250673A EP 2241644 B1 EP2241644 B1 EP 2241644B1
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weight percent
aluminum
alloy
alloys
element selected
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EP2241644A1 (fr
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Awadh B. Pandey
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RTX Corp
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United Technologies Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent

Definitions

  • the present invention relates generally to aluminum alloys and more specifically to heat treatable aluminum alloys produced by melt processing and strengthened by L1 2 phase dispersions.
  • aluminum alloys with improved elevated temperature mechanical properties is a continuing process.
  • Some attempts have included aluminum-iron and aluminum-chromium based alloys such as Al-Fe-Ce, Al-Fe-V-Si, Al-Fe-Ce-W, and Al-Cr-Zr-Mn that contain incoherent dispersoids. These alloys, however, also lose strength at elevated temperatures due to particle coarsening. In addition, these alloys exhibit ductility and fracture toughness values lower than other commercially available aluminum alloys.
  • U.S. Patent No. 6,248,453 discloses aluminum alloys strengthened by dispersed Al 3 X L1 2 intermetallic phases where X is selected from the group consisting of Sc, Er, Lu, Yb, Tm, and U.
  • the Al 3 X particles are coherent with the aluminum alloy matrix and are resistant to coarsening at elevated temperatures.
  • the improved mechanical properties of the disclosed dispersion strengthened L1 2 aluminum alloys are stable up to 572°F (300°C).
  • the alloys need to be manufactured by expensive rapid solidification processes with cooling rates in excess of 1.8x10 3 °F/sec (10 3 °C/sec).
  • U.S. Patent Application Publication No. 2006/0269437 discloses an aluminum alloy that contains scandium and other elements. While the alloy is effective at high temperatures, it is not capable of being heat treated using a conventional age hardening mechanism.
  • JP 09104940 discloses an Al-Cu base alloy with various additions including scandium and zirconium.
  • the present invention is heat treatable aluminum alloys that can be cast, wrought, or formed by rapid solidification, and thereafter heat treated.
  • the alloys can achieve high temperature performance and can be used at temperatures up to about 650°F (343°C).
  • These alloys comprise silicon, magnesium, and an Al 3 X L1 2 dispersoid where X is at least one first element selected from erbium, thulium, ytterbium, and lutetium, and at least one second element selected from gadolinium, yttrium, titanium, hafnium, and niobium.
  • the balance is substantially aluminum.
  • the alloys may also have less than 1.0 weight percent total impurities.
  • the present invention provides a heat treatable aluminum alloy consisting of: 0.2 to 3.0 weight percent magnesium; at least one element selected from the group consisting of 0.1 to 2.0 weight percent silicon, and 0.1 to 2.0 weight percent manganese; at least one first element selected from the group consisting of 0.1 to 6.0 weight percent erbium, 0.1 to 10 weight percent thulium, 0.1 to 15.0 weight percent ytterbium, and 0.1 to 12 weight percent lutetium; at least one second element selected from the group consisting of 0.1 to 4.0 weight percent gadolinium, 0.1 to 4.0 weight percent yttrium, 0.05 to 2.0 weight percent titanium, 0.05 to 2.0 weight percent hafnium, and 0.05 to 1.0 weight percent niobium; optionally consisting of at least one of 0.001 to 0.1 weight percent sodium, 0.001 to 0.1 weight percent calcium, 0.001 to 0.1 weight percent strontium, 0.001 to 0.1 weight percent antimony, 0.001 to 0.1 weight percent barium, and 0.001 to
  • the present invention provides a method of forming a heat treatable aluminum alloy, the method comprising: (a) forming a melt consisting of: 0.2 to 3.0 weight percent magnesium; at least one element selected from the group consisting of 0.1 to 2.0 weight percent silicon, and 0.1 to 2.0 weight percent manganese; at least one first element selected from the group consisting of 0.1 to 6.0 weight percent erbium, 0.1 to 10 weight percent thulium, 0.1 to 15.0 weight percent ytterbium, and 0.1 to 12 weight percent lutetium; at least one second element selected from the group consisting of 0.1 to 4.0 weight percent gadolinium, 0.1 to 4.0 weight percent yttrium, 0.05 to 2.0 weight percent titanium, 0.05 to 2.0 weight percent hafnium, and 0.05 to 1.0 weight percent niobium; optionally consisting of at least one of 0.001 to 0.1 weight percent sodium, 0.001 to 0.1 weight percent calcium, 0.001 to 0.1 weight percent strontium, 0.001 to 0.1 to
  • the alloys are formed by a process selected from casting, deformation processing and rapid solidification.
  • the alloys are then heat treated at a temperature of from about 800°F (426°C) to about 1100°F (593°C) for between about 30 minutes and four hours, followed by quenching in water, and thereafter aged at a temperature from about 200°F (93°C) to about 600°F (315°C) for about two to forty eight hours.
  • the alloys of this invention are based on the aluminum-magnesium-silicon system.
  • the aluminum silicon phase diagram is shown in FIG. 1 .
  • the binary system is a simple eutectic alloy system with a eutectic reaction at 12.5 weight percent silicon and 1077°F (577°C). There is little solubility of silicon in aluminum at temperatures up to 930°F (500°C) and none of aluminum in silicon.
  • Hypereutectic alloys with silicon contents greater than the eutectic composition solidify with a microstructure of primary silicon grains in a finely divided aluminum/silicon eutectic matrix phase. Alloys of this invention include alloys with the addition of about 0.1 to about 2.0 weight percent silicon, more preferably about 0.2 to about 1.6 weight percent silicon, and even more preferably about 0.3 to about 1.4 weight percent silicon.
  • the alloys are formed by a process selected from casting, casting plus deformation processing and rapid solidification. Following formation the alloys are heat treated at a temperature from about 800°F (425°C) to about 1100°F (593°C) for between about 30 minutes and four hours, followed by quenching in a liquid, and thereafter aged at a temperature from about 200°F (93°C) to about 600°F (315°C) for about two to about forty-eight hours.
  • the alloys of this invention are based on the aluminum magnesium system.
  • the aluminum magnesium phase diagram is shown in FIG. 2 .
  • the binary system is a eutectic alloy system with a eutectic reaction at 36 weight percent magnesium and 842°F (450°C).
  • Magnesium has maximum solid solubility of 16 weight percent in aluminum at 842°F (450°C).
  • the amount of magnesium in these alloys ranges from about 0.2 to about 3.0 weight percent, more preferably about 0.4 to about 2.0 weight percent, and even more preferably about 0.5 to about 1.6 weight percent.
  • the ratio of magnesium to silicon is about 2.5:1, more preferably about 2:1, and even more preferably about 1.75:1.
  • the aluminum manganese phase diagram is shown in FIG. 3 .
  • the aluminum manganese binary system is a eutectic alloy system with a eutectic reaction at 2.0 weight percent manganese and 1216.4°F (658°C).
  • Manganese has maximum solid solubility of about 2 weight percent in aluminum at 1216.4°F (658°C) which can be extended further by rapid solidification processing.
  • Manganese provides a considerable amount of precipitation strengthening in aluminum by precipitation of fine Al 6 Mn second phases.
  • the present invention is focused on hypoeutectic alloy composition ranges.
  • the amount of manganese in these alloys ranges from about 0.1 to about 2.0 weight percent, more preferably about 0.2 to about 1.5 weight percent, and even more preferably about 0.3 to about 1.0 weight percent.
  • Aluminum-magnesium-silicon alloys can include manganese.
  • Mg 2 Si and Si crystals precipitate in aluminum-magnesium-silicon alloys following a solution heat treatment, quench, and age process.
  • Mg 2 Al 3 ( ⁇ ) phase precipitates as large intermetallic particles in high magnesium containing aluminum alloys which is not desired from a strengthening point of view.
  • the presence of L1 2 phase prevents formation of ⁇ phase in this material which improves ductility and toughness of material.
  • Exemplary aluminum alloys of this invention include, but are not limited to (in weight percent):
  • Examples of other alloys similar to the above are those alloys with the addition of about 0.1 to about 2.0 weight percent Mn, more preferably alloys with the addition of about 0.2 to about 1.5 weight percent Mn, and even more preferably alloys with the addition of about 0.3 to about 1.0 weight percent Mn.
  • erbium, thulium, ytterbium, and lutetium are potent strengtheners that have low diffusivity and low solubility in aluminum. All these elements form equilibrium Al 3 X intermetallic dispersoids where X is at least one of erbium, ytterbium, lutetium, that have an L1 2 structure that is an ordered face centered cubic structure with the X atoms located at the corners and aluminum atoms located on the cube faces of the unit cell.
  • Erbium forms Al 3 Er dispersoids in the aluminum matrix that are fine and coherent with the aluminum matrix.
  • the lattice parameters of aluminum and Al 3 Er are close (0.405 nm and 0.417 nm respectively), indicating there is minimal driving force for causing growth of the Al 3 Er dispersoids.
  • This low interfacial energy makes the Al 3 Er dispersoids thermally stable and resistant to coarsening up to temperatures as high as about 842°F (450°C).
  • Addition of magnesium in solid solution in aluminum increases the lattice parameter of the aluminum matrix, and decreases the lattice parameter mismatch further increasing the resistance of the Al 3 Er to coarsening.
  • these Al 3 Er dispersoids are made stronger and more resistant to coarsening at elevated temperatures by adding suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or combinations thereof that enter Al 3 Er in solution.
  • suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or combinations thereof that enter Al 3 Er in solution.
  • Thulium forms metastable Al 3 Tm dispersoids in the aluminum matrix that are fine and coherent with the aluminum matrix.
  • the lattice parameters of aluminum and Al 3 Tm are close (0.405 nm and 0.420 nm respectively), indicating there is minimal driving force for causing growth of the Al 3 Tm dispersoids.
  • This low interfacial energy makes the Al 3 Tm dispersoids thermally stable and resistant to coarsening up to temperatures as high as about 842°F (450°C).
  • Addition of magnesium in solid solution in aluminum increases the lattice parameter of the aluminum matrix and decreases the lattice parameter mismatch further increasing the resistance to coarsening of the dispersoid.
  • these Al 3 Tm dispersoids are made stronger and more resistant to coarsening at elevated temperatures by adding suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or combinations thereof that enter Al 3 Tm in solution.
  • suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or combinations thereof that enter Al 3 Tm in solution.
  • Ytterbium forms Al 3 Yb dispersoids in the aluminum matrix that are fine and coherent with the aluminum matrix.
  • the lattice parameters of Al and Al 3 Yb are close (0.405 nm and 0.420 nm respectively), indicating there is minimal driving force for causing growth of the Al 3 Yb dispersoids.
  • This low interfacial energy makes the Al 3 Yb dispersoids thermally stable and resistant to coarsening up to temperatures as high as about 842°F (450°C).
  • Addition of magnesium in solid solution in aluminum increases the lattice parameter of the aluminum matrix and decreases the lattice parameter mismatch further increasing the resistance to coarsening of the Al 3 Yb.
  • these Al 3 Yb dispersoids are made stronger and more resistant to coarsening at elevated temperatures by adding suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or combinations thereof that enter Al 3 Yb in solution.
  • Al 3 Lu dispersoids forms Al 3 Lu dispersoids in the aluminum matrix that are fine and coherent with the aluminum matrix.
  • the lattice parameters of Al and Al 3 Lu are close (0.405 nm and 0.419 nm respectively), indicating there is minimal driving force for causing growth of the Al 3 Lu dispersoids.
  • This low interfacial energy makes the Al 3 Lu dispersoids thermally stable and resistant to coarsening up to temperatures as high as about 842°F (450°C).
  • Addition of magnesium in solid solution in aluminum increases the lattice parameter of the aluminum matrix and decreases the lattice parameter mismatch further increasing the resistance to coarsening of Al 3 Lu.
  • these Al 3 Lu dispersoids are made stronger and more resistant to coarsening at elevated temperatures by adding suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or mixtures thereof that enter Al 3 Lu in solution.
  • suitable alloying elements such as gadolinium, yttrium, titanium, hafnium, niobium, or mixtures thereof that enter Al 3 Lu in solution.
  • Gadolinium forms metastable Al 3 Gd dispersoids in the aluminum matrix that have an L1 2 structure in the metastable condition.
  • the Al 3 Gd dispersoids are stable up to temperatures as high as about 842°F (450°C) due to their low diffusivity in aluminum.
  • the Al 3 Gd dispersoids have a D0 19 structure in the equilibrium condition.
  • gadolinium has fairly high solubility in the Al 3 X intermetallic dispersoids (where X is erbium, thulium, ytterbium or lutetium).
  • Gadolinium can substitute for the X atoms in Al 3 X intermetallic, thereby forming an ordered L1 2 phase which results in improved thermal and structural stability.
  • Yttrium forms metastable Al 3 Y dispersoids in the aluminum matrix that have an L1 2 structure in the metastable condition and a D0 19 structure in the equilibrium condition.
  • the metastable Al 3 Y dispersoids have a low diffusion coefficient which makes them thermally stable and highly resistant to coarsening.
  • Yttrium has a high solubility in the Al 3 X intermetallic dispersoids allowing large amounts of yttrium to substitute for X in the Al 3 X L1 2 dispersoids which results in improved thermal and structural stability.
  • Titanium forms Al 3 Ti dispersoids in the aluminum matrix that have an L1 2 structure in the metastable condition and D0 22 structure in the equilibrium condition.
  • the metastable Al 3 Ti dispersoids have a low diffusion coefficient which makes them thermally stable and highly resistant to coarsening.
  • Titanium has a high solubility in the Al 3 X dispersoids allowing large amounts of titanium to substitute for X in the Al 3 X dispersoids, which results in improved thermal and structural stability.
  • Hafnium forms metastable Al 3 Hf dispersoids in the aluminum matrix that have an L1 2 structure in the metastable condition and a D0 23 structure in the equilibrium condition.
  • the Al 3 Hf dispersoids have a low diffusion coefficient, which makes them thermally stable and highly resistant to coarsening.
  • Hafnium has a high solubility in the Al 3 X dispersoids allowing large amounts of hafnium to substitute for erbium, thulium, ytterbium, and lutetium in the above mentioned Al 3 X dispersoids, which results in stronger and more thermally stable dispersoids.
  • Niobium forms metastable Al 3 Nb dispersoids in the aluminum matrix that have an L1 2 structure in the metastable condition and a D0 22 structure in the equilibrium condition.
  • Niobium has a lower solubility in the Al 3 X dispersoids than hafnium or yttrium, allowing relatively lower amounts of niobium than hafnium or yttrium to substitute for X in the Al 3 X dispersoids. Nonetheless, niobium can be very effective in slowing down the coarsening kinetics of the Al 3 X dispersoids because the Al 3 Nb dispersoids are thermally stable. The substitution of niobium for X in the above mentioned Al 3 X dispersoids results in stronger and more thermally stable dispersoids.
  • Al 3 X L1 2 precipitates improve elevated temperature mechanical properties in aluminum alloys for two reasons.
  • the precipitates are ordered intermetallic compounds. As a result, when the particles are sheared by glide dislocations during deformation, the dislocations separate into two partial dislocations separated by an anti-phase boundary on the glide plane. The energy to create the anti-phase boundary is the origin of the strengthening.
  • the cubic L1 2 crystal structure and lattice parameter of the precipitates are closely matched to the aluminum solid solution matrix. This results in a lattice coherency at the precipitate/matrix boundary that resists coarsening. The lack of an interphase boundary results in a low driving force for particle growth and resulting elevated temperature stability. Alloying elements in solid solution in the dispersed strengthening particles and in the aluminum matrix that tend to decrease the lattice mismatch between the matrix and particles will tend to increase the strengthening and elevated temperature stability of the alloy.
  • the amount of erbium present in the alloys of this invention may vary from about 0.1 to about 6.0 weight percent, more preferably from about 0.1 to about 4 weight percent, and even more preferably from about 0.2 to 2 weight percent.
  • the Al-Er phase diagram shown in FIG. 4 indicates a eutectic reaction at about 6 weight percent erbium at about 1211°F (655°C).
  • Aluminum alloys with less than about 6 weight percent erbium can be quenched from the melt to retain erbium in solid solutions that may precipitate as dispersed L1 2 intermetallic Al 3 Er following an aging treatment.
  • Alloys with erbium in excess of the eutectic composition can only retain erbium in solid solution by rapid solidification processing (RSP) where cooling rates are in excess of about 10 3 °C/second. Alloys with erbium in excess of the eutectic composition (hypereutectic alloys) cooled normally will have a microstructure consisting of relatively large Al 3 Er dispersoid in a finely divided aluminum-Al 3 Er eutectic phase matrix.
  • the amount of thulium present in the alloys of this invention may vary from about 0.1 to about 10 weight percent, more preferably from about 0.2 to about 6 weight percent, and even more preferably from about 0.2 to about 4 weight percent.
  • the Al-Tm phase diagram shown in FIG. 5 indicates a eutectic reaction at about 10 weight percent thulium at about 1193°F (645°C).
  • Thulium forms metastable Al 3 Tm dispersoids in the aluminum matrix that have an L1 2 structure in the equilibrium condition.
  • the Al 3 Tm dispersoids have a low diffusion coefficient which makes them thermally stable and highly resistant to coarsening.
  • Aluminum alloys with less than 10 weight percent thulium can be quenched from the melt to retain thulium in solid solution that may precipitate as dispersed metastable L1 2 intermetallic Al 3 Tm following an aging treatment. Alloys with thulium in excess of the eutectic composition can only retain Tm in solid solution by rapid solidification processing (RSP) where cooling rates are in excess of about 10 3 °C/second.
  • RSP rapid solidification processing
  • the amount of ytterbium present in the alloys of this invention may vary from about 0.1 to about 15 weight percent more preferably from about 0.2 to about 8 weight percent, and even more preferably from about 0.2 to about 4 weight percent.
  • the Al-Yb phase diagram shown in FIG. 6 indicates a eutectic reaction at about 21 weight percent ytterbium at about 1157°F (625°C).
  • Aluminum alloys with less than about 21 weight percent ytterbium can be quenched from the melt to retain ytterbium in solid solution that may precipitate as dispersed L1 2 intermetallic Al 3 Yb following an aging treatment. Alloys with ytterbium in excess of the eutectic composition can only retain ytterbium in solid solution by rapid solidification processing (RSP) where cooling rates are in excess of about 10 3 °C/second.
  • RSP rapid solidification processing
  • the amount of lutetium present in the alloys of this invention may vary from about 0.1 to about 12 weight percent, more preferably from 0.2 to about 8 weight percent, and even more preferably from about 0.2 to about 4 weight percent.
  • the Al-Lu phase diagram shown in FIG. 7 indicates a eutectic reaction at about 11.7 weight percent Lu at about 1202°F (650°C).
  • Aluminum alloys with less than about 11.7 weight percent lutetium can be quenched from the melt to retain Lu in solid solution that may precipitate as dispersed L1 2 intermetallic Al 3 Lu following an aging treatment. Alloys with Lu in excess of the eutectic composition can only retain Lu in solid solution by rapid solidification processing (RSP) where cooling rates are in excess of about 10 3 °C/second.
  • RSP rapid solidification processing
  • the amount of gadolinium present in the alloys of this invention may vary from about 0.1 to about 4 weight percent, more preferably from 0.2 to about 2 weight percent, and even more preferably from about 0.5 to about 2 weight percent.
  • the amount of yttrium present in the alloys of this invention may vary from about 0.1 to about 4 weight percent, more preferably from 0.2 to about 2 weight percent, and even more preferably from about 0.5 to about 2 weight percent.
  • the amount of titanium present in the alloys of this invention may vary from about 0.05 to 2 about weight percent, more preferably from 0.1 to about 1 weight percent, and even more preferably from about 0.1 to about 0.5 weight percent.
  • the amount of hafnium present in the alloys of this invention may vary from about 0.05 to about 2 weight percent, more preferably from 0.1 to about 1 weight percent, and even more preferably from about 0.1 to about 0.5 weight percent.
  • the amount of niobium present in the alloys of this invention may vary from about 0.05 to about 1 weight percent, more preferably from 0.1 to about 0.75 weight percent, and even more preferably from about 0.1 to about 0.5 weight percent.
  • inventive alloys include at least one of about 0.001 weight percent to about 0.10 weight percent sodium, about 0.001 weight percent to about 0.10 weight percent calcium, about 0.001 to about 0.10 weight percent strontium, about 0.001 to about 0.10 weight percent antimony, 0.001 to 0.10 weight percent barium and about 0.001 to about 0.10 weight percent phosphorus. These are added to refine the microstructure of the eutectic phase and the primary silicon particle morphology and size.
  • These aluminum alloys may be made by any and all consolidation and fabrication processes known to those in the art such as casting (without further deformation), deformation processing (wrought processing), rapid solidification processing, forging, extrusion, rolling, die forging, powder metallurgy and others.
  • the rapid solidification process should have a cooling rate greater than about 10 3 °C/second including but not limited to powder processing, atomization, melt spinning, splat quenching, spray deposition, cold spray, plasma spray, laser melting and deposition, ball milling and cryomilling.
  • Preferred exemplary aluminum alloys of this invention include, but are not limited to (in weight percent):
  • alloys with the addition of about 0.1 to about 2.0 weight percent Mn more preferably alloys with the addition of about 0.2 to about 1.5 weight percent Mn, and even more preferably alloys with the addition of about 0.3 to about 1.0 weight percent Mn.
  • alloys similar to these are alloys with the addition of about 0.1 to about 2.0 weight percent Mn, more preferably alloys with the addition of about 0.2 to about 1.5 weight percent Mn, and even more preferably alloys with the addition of about 0.3 to about 1.0 weight percent Mn.
  • One aspect of at least the preferred embodiment of the present invention is a heat treatable aluminum alloy comprising about 0.2 to about 3.0 weight percent magnesium, at least one element selected from the group consisting of about 0.1 to about 2.0 weight percent silicon, and about 0.1 to about 2.0 weight percent manganese; an aluminum solid solution matrix containing a plurality of dispersed Al 3 X second phases having L1 2 structures where X comprises at least one of erbium, thulium, ytterbium, lutetium, and at least one of gadolinium, yttrium, titanium, hafnium, niobium.
  • the alloy comprises an aluminum solid solution matrix, precipitates including but not limited to Mg 2 Si, Al 6 Mn, and a plurality of dispersed Al 3 X second phases having L1 2 structures where X comprises at least one of erbium, thulium, ytterbium, lutetium, and at least one of gadolinium, yttrium, titanium, hafnium, niobium.
  • the alloy comprises at least one of about 0.1 to about 6.0 weight percent erbium, about 0.1 to about 10 weight percent thulium, about 0.1 to about 15.0 weight percent ytterbium, about 0.1 to about 12 weight percent lutetium, and about 0.1 to about 4.0 weight percent gadolinium, about 0.1 to about 4.0 weight percent yttrium, about 0.05 to about 1.0 weight percent zirconium, about 0.05 to about 2.0 weight percent titanium, about 0.05 to about 2.0 weight percent hafnium, and about 0.05 to about 1.0 weight percent niobium.

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Claims (11)

  1. Alliage d'aluminium à traitement thermique composé de :
    0,2 à 3,0 pourcent en poids de magnésium ;
    au moins un élément choisi dans un groupe composé de 0,1 à 2,0 pourcent en poids de silicium, et 0,1 à 2,0 pourcent en poids de manganèse ;
    au moins un premier élément choisi dans un groupe composé de 0,1 à 6,0 pourcent en poids d'erbium, 0,1 à 10 pourcent en poids de thulium, 0,1 à 15,0 pourcent en poids d'ytterbium, et 0,1 à 12 pourcent en poids de lutétium ;
    au moins un second élément choisi dans un groupe composé de 0,1 à 4,0 pourcent en poids de gadolinium, 0,1 à 4,0 pourcent en poids d'yttrium, 0,05 à 2,0 pourcent en poids de titane, 0,05 à 2,0 pourcent en poids d'hafnium, et 0,05 à 1,0 pourcent en poids de niobium ;
    éventuellement composé d'au moins un de 0,001 à 0,1 pourcent en poids de sodium, 0,001 à 0,1 pourcent en poids de calcium, 0,001 à 0,1 pourcent en poids de strontium, 0,001 à 0,1 pourcent en poids d'antimoine, 0,001 à 0,1 pourcent en poids de baryum, et 0,001 à 0,1 pourcent en poids de phosphore, composé de pas plus de 1,0 pourcent en poids total d'autres éléments incluant des impuretés, et ;
    éventuellement composé de pas plus de 0,1 pourcent en poids de fer, 0,1 pourcent en poids de chrome, 0,1 pourcent en poids de vanadium, 0,1 pourcent en poids de cobalt, et 0,1 pourcent en poids de nickel ; et
    le reste étant de l'aluminium avec des impuretés inévitables.
  2. Alliage selon la revendication 1, dans lequel l'alliage comprend une matrice de solution solide d'aluminium contenant une pluralité de secondes phases d'Al3X dispersées ayant des structures L12, dans lequel X inclut au moins un premier élément et au moins un second élément.
  3. Alliage selon la revendication 1, dans lequel l'alliage comprend une matrice de solution solide d'aluminium et des précipités incluant mais sans limitation du Mg2Si, et de l'Al6Mn ;
    une pluralité de secondes phases d'Al3X dispersées ayant des structures L12, dans lequel X inclut au moins un premier élément choisi dans un groupe composé de 0,1 à 6,0 pourcent en poids d'erbium, 0,1 à 10 pourcent en poids de thulium, 0,1 à 15,0 pourcent en poids d'ytterbium, et 0,1 à 12 pourcent en poids de lutétium ; et
    au moins un second élément choisi dans un groupe composé de 0,1 à 4,0 pourcent en poids de gadolinium, 0,1 à 4,0 pourcent en poids d'yttrium, 0,05 à 2,0 pourcent en poids de titane, 0,05 à 2,0 pourcent en poids d'hafnium, et 0,05 à 1,0 pourcent en poids de niobium ; et
    le reste étant de l'aluminium avec des impuretés inévitables.
  4. Alliage selon la revendication 1, 2 ou 3, dans lequel l'au moins un élément choisi dans un groupe composé de 0,1 à 2,0 pourcent en poids de silicium, 0,2 à 6,5 pourcent en poids de cuivre, 0,1 à 2,0 pourcent en poids de manganèse est 0,1 à 2,0 pourcent en poids de silicium.
  5. Alliage selon une quelconque revendication précédente, dans lequel la quantité de silicium s'inscrit dans la plage de 0,2 à 1,6 pourcent en poids.
  6. Alliage selon la revendication 1, 2 ou 3, dans lequel l'au moins un élément choisi dans un groupe composé de 0,1 à 2,0 pourcent en poids de silicium, et 0,1 à 2,0 pourcent en poids de manganèse est 0,1 à 2,0 pourcent en poids de manganèse.
  7. Procédé de formation d'un alliage d'aluminium à traitement thermique, le procédé comprenant :
    (a) la formation d'une fonte composée de :
    0,2 à 3,0 pourcent en poids de magnésium ;
    au moins un élément choisi dans un groupe composé de 0,1 à 2,0 pourcent en poids de silicium, et 0,1 à 2,0 pourcent en poids de manganèse ;
    au moins un premier élément choisi dans un groupe composé de 0,1 à 6,0 pourcent en poids d'erbium, 0,1 à 10 pourcent en poids de thulium, 0,1 à 15,0 pourcent en poids d'ytterbium, et 0,1 à 12 pourcent en poids de lutétium ;
    au moins un second élément choisi dans un groupe composé de 0,1 à 4,0 pourcent en poids de gadolinium, 0,1 à 4,0 pourcent en poids d'yttrium, 0,05 à 2,0 pourcent en poids de titane, 0,05 à 2,0 pourcent en poids d'hafnium, et 0,05 à 1,0 pourcent en poids de niobium ;
    éventuellement composé d'au moins 0,001 à 0,1 pourcent en poids de sodium, 0,001 à 0,1 pourcent en poids de calcium, 0,001 à 0,1 pourcent en poids de strontium, 0,001 à 0,1 pourcent en poids d'antimoine, 0,001 à 0,1 pourcent en poids de baryum, et 0,001 à 0,1 pourcent en poids de phosphore, composé de pas plus de 1,0 pourcent en poids total d'autres éléments incluant des impuretés, et ;
    éventuellement composé de pas plus de 0,1 pourcent en poids de fer, 0,1 pourcent en poids de chrome, 0,1 pourcent en poids de vanadium, 0,1 pourcent en poids de cobalt, et 0,1 pourcent en poids de nickel ; et
    le reste étant de l'aluminium avec des impuretés inévitables ;
    (b) la solidification de la fonte pour former un corps solide ; et
    (c) le traitement thermique du corps solide.
  8. Procédé selon la revendication 7 comprenant en outre :
    l'affinement de la structure du corps solide par un processus de déformation incluant mais sans limitation ces procédés : une extrusion, un forgeage et un laminage.
  9. Procédé selon la revendication 7 ou 8, dans lequel la solidification comprend un procédé de solidification rapide dans lequel la vitesse de refroidissement est supérieure à 103 °C/seconde incluant au moins un de : un processus de poudre, une atomisation, un filage par fusion, une hypertrempe, un dépôt par pulvérisation, une projection à froid, une projection au plasma, une fusion et un dépôt par laser, un broyage à boulets, et un cryobroyage.
  10. Procédé selon la revendication 7, 8 ou 9, dans lequel le traitement thermique comprend :
    un traitement thermique de mise en solution à 800 °F (426 °C) à 1 100 °F (593 °C) pendant trente minutes à quatre heures ; et
    une trempe ; et
    un vieillissement à une température de 200 °F (93 °C) à 600 °F (315 °C) pendant deux à quarante-huit heures.
  11. Procédé selon la revendication 7 comprenant la formation de l'alliage par un procédé choisi parmi un moulage, et un processus de déformation ultérieur, et un processus de solidification rapide.
EP10250673.0A 2009-04-07 2010-03-31 Alliages d'aluminium L12 traitables thermiquement Not-in-force EP2241644B1 (fr)

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