Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C18/00—Alloys based on zinc
  • C22C18/04—Alloys based on zinc with aluminium as the next major constituent

Definitions

• ABSTRACT [30] Foreign Application Priority Data
• a zinc-aluminum alloy comprises 18-24 aluminum
• Sheets and strips made of wrought zinc alloys in addition to high strength, must normally have good shaping properties, both with regard to working by folding and bending and working by stamping and drawing.
• Excellent wrought alloys with a high ductility are formed by binary zinc-aluminum alloys with about 1-63% aluminum and 3799% zinc.
• the mixed crystalls of these alloys are caused to break down to a super-fine grain eutectic structure by suitable heat treatment.
• an alloy is formed of high ductility which possesses the property to undergo strong plastic deformation at extremely low mechanical stresses (DDRP [East German Patent] 4822; Sauerwald, F.: Arch. Metallkde, H. 5, 1949, p. 165; Mitbauer, H. and F. Sauerwald: Z. Metallkde, 43, 1952, p. 244; Schultze W. and F. Sauerwald: Z. Metallkde, 53, 1962, p. 660).
• the creep resistance of the zinc-aluminum alloy s can be improved by small additions of nickel which have a degree of solubility in solid aluminum and zinc.
• the nickel causes the alloy to become more brittle.
• the excellent ductility of these alloys thus is almost completely lost and the elongation value at a tensile stress of 40 kp/mm is reduced to below percent.
• the invention resides in a zinc-aluminum alloy which comprises 18 24 aluminum, 0.0005 0.05 magnesium, 0.0025 0.25 nickel, balance high-grade zinc.
• the aluminum content of the alloy of the invention is 21
• the preferred magnesium content is 0.001 to 0.01 magnesium.
• the nickel content is at least five time the specific amount of magnesium present.
• the preferred aging temperature is between 120 and 200 C.
• the break down of the mixed crystals can be substantially retarded by adding magnesium to the zincaluminum alloy in order to suppress the intercrystalline corrosion.
• the reason is that the solubility of the magnesium in solid zinc is reduced.
• the increase of strength is therefore accompanied again by a decrease of the ductility.
• the effect of the magnesium to make the alloy more brittle can be avoided only by keeping the magnesium content of the alloy at a level below 0.0005%.
• the alloys described in the invention were made by melting the components at a temperature of 450C and casting the alloy to ingots of the thickness of 4 cm. After a subsequent homogenizing treatment, at a temperature of 350C, each ingot was hot rolled at a temperature of 300C in several passes to a final sheet thickness of 1 mm.
• EXAMPLE 1 A prior-art alloy, consisting of 21% aluminum 79% zinc and formed into a sheet as described before had the following mechanical properties:
• a sheet was formed from a prior-art alloy comprising 21 aluminum 0.2 nickel balance high-grade zinc The sheet had the following properties tensile strength 21 kp/mm elongation 130% creep resistance 12 kp/mm EXAMPLE 3 A sheet was formed of a prior-art alloy comprising 21% aluminum 0.04% magnesium balance high-grade zinc The sheet had the following properties:
• the alloy of claim 1 which comprises 2] aluminum, 0.2 nickel, 0.04 magnesium, balance zinc.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Forging (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Continuous Casting (AREA)
• Photoreceptors In Electrophotography (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=5764117

Family Applications (1)

Country Status (7)

Families Citing this family (1)

• 1970
  • 1970-03-05 DE DE19702010299 patent/DE2010299A1/de active Pending
  • 1970-12-03 FR FR7043477A patent/FR2083826A5/fr not_active Expired
  • 1970-12-18 NL NL7018487A patent/NL7018487A/xx unknown
  • 1970-12-18 BE BE760566A patent/BE760566A/xx unknown
• 1971
  • 1971-02-02 SU SU1623247A patent/SU420189A3/ru active
  • 1971-03-03 US US00120718A patent/US3754904A/en not_active Expired - Lifetime
  • 1971-04-19 GB GB2190871A patent/GB1312867A/en not_active Expired

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