US3384517A - Copper/iron/aluminm alloys - Google Patents

Copper/iron/aluminm alloys Download PDF

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Publication number
US3384517A
US3384517A US513786A US51378665A US3384517A US 3384517 A US3384517 A US 3384517A US 513786 A US513786 A US 513786A US 51378665 A US51378665 A US 51378665A US 3384517 A US3384517 A US 3384517A
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United States
Prior art keywords
iron
alloys
copper
aluminum
percent
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Expired - Lifetime
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US513786A
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English (en)
Inventor
Harper Sydney
Anderson Ross Mckenzie
Eborall Richard John Lane
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National Research Development Corp UK
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Nat Res Dev
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    • 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
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/01—Alloys based on copper with aluminium as the next major constituent

Definitions

  • Copper-iron-aluminum alloys comprising a matrix of a copper-rich solid solution phase containing about -10 percent by weight of aluminum, said matrix containing in the form of fibre, an iron-rich solid solution phase containing about 10-20 percent by Weight of aluminum, have been found to provide unexpectedly high tensile strengths.
  • the desired fibre form of the iron-rich solid solution in the alloy may be obtained by subjecting a casting of the 'alloy to a hot working process such as an extrusion or a rolling treatment, preferably followed by a cold-working process.
  • This invention relates to copper-iron-aluminum.
  • alloys and according to the invention such an alloy comprises a matrix of a copper-rich solid solution phase containing about 5-10 percent by weight of aluminum and said matrix contains, in the form of fibre, an iron-rich solid solution phase containing about 10-20 percent by weight of aluminum.
  • the alloy according to the invention should preferably comprise not less than 20 percent and not more than about 50 percent by weight of iron and preferably the total aluminum content should not be greater than about percent, nor less than about 5 percent by weight.
  • the fibrous structure need not be confined to actual fibres-it may be formed as a multiplicity, for example, of platelets or the like; but the form of the structure will generally be characterised by the presence of particles of the ironrich solid solution phase having at least a dimension longitudinally which is many times greater than that transversely.
  • the accompanying drawing shows a phase diagram attributed to Bradley 'and Goldschmidt (J. In-st. Metals, 1939, 65 389) and represents the condition of slowly cooled alloys in the copper-iron-aluminum system. Since changes are slow at temperatures below 500 C., the diagram has been generally considered to correspond to equilibrium at about 500 C. Reference to this diagram shows that, at temperatures near 500 C. and below, an alloy according to the invention should preferably be of substantially one of the compositions represented within the hatched area. It is seen that there is no tendency for the gamma copper-aluminum phase to form in the alloys according to the invention, except near the upper limits of aluminum content. In fact, as shown in the diagram, it appears that the upper limit of aluminum content can be as high as about 15 percent by weight, when iron is present in its higher concentrations.
  • ice Alloys in accordance with the invention will almost invariably initially be in the form of castings and may be prepared using techniques similar to those used for the preparation of the well-known aluminum-bronze alloys, having regard to the somewhat higher melting point (i.e. in the range up to 1375 C., compared with about 1080 C. for the aluminum-bronzes) and a longer freezing range.
  • the microstructure, in the as-cast condition, of alloys in accordance with the invention consists of dendrites 'of the iron-rich solid solution phase in the matrix of a copper-rich phase, and it would appear that the iron-rich solid solution phase is the Fe Al phase in the binary Fe-Al system with the addition of about 5-10 (Weight) percent of copper in solution. It is essential to work these cast alloys so that the iron-rich solid solution phase becomes elongated to achieve the desired fibre form.
  • Table 1 indicates that 1t is possible for alloys within the range of the present composition to be brought into condition by subjecting a cast ingot to a 50-90 percent reduction by uni-directional hot-rolling at temperatures above 500 C. to exhibit yield strengths some 50 percent higher than those normally attributed to aluminum bronzes in which the iron content is of the order of only up to about 6 (weight) percent; typical figures for these aluminum bronzesare tensile strength 40-44.5 tons/sq. in. and elongation of 12-20 percent. Extrusion in ratios of about 9:1 upwards at temperatures round about 800 C.900 C. also produces material with properties comparable with those obtained by straight forward hot-rolling as reference to the tables shows.
  • the hardness of the iron-rich phase although substantially greater than that of the copper-rich matrix phase is still of the same order of magnitude; for example, in one alloy, the hardness of the iron-rich phase was found to be 360 Vickers Hardness, while that of the copper-rich phase was 200.
  • the alloys would appear not to be true, so-called, fibre-reinforced alloys for, in the latter alloys, it is usual for the material of the fibres to be at least of an order or so higher in hardness than the matrix material. The high material strengths attained by the present alloys are, therefore, somewhat unexpected.
  • a copper-iron-aluminum alloy comprising a matrix of a copper-rich solid solution phase containing about 5-10 percent by weight of aluminum, said matrix containing in the form of fibre, an iron-rich solid solution phase containing about 10-20 percent by weight aluminum, said alloy comprising not less than 20% and not more than by weight of iron and having a total aluminum content of not greater than about 15% and not less than about 5% by weight.
  • a process for preparing the alloy of claim 1 which comprises'hot working a casting of a copper-iron-aluminum alloy comprising a matrix of a copper-rich solid solution phase containing about 5-10 percent by weight of aluminum, said matrix containing an iron-rich solid solution phase containing about 10-20 percent by weight of aluminum, said alloy comprising not less than 20% and not more than 50% by weight of iron and having a total aluminum content of not greater than 15 and not less than about 5% by weight, to elongate said iron-rich solid solution into the form of fibre.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Fibers (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
US513786A 1964-12-22 1965-12-14 Copper/iron/aluminm alloys Expired - Lifetime US3384517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB52152/64A GB1137123A (en) 1964-12-22 1964-12-22 Improvements in and relating to copper/iron/aluminium alloys

Publications (1)

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US3384517A true US3384517A (en) 1968-05-21

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US513786A Expired - Lifetime US3384517A (en) 1964-12-22 1965-12-14 Copper/iron/aluminm alloys

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US (1) US3384517A (fr)
CH (1) CH450733A (fr)
DE (1) DE1483271A1 (fr)
GB (1) GB1137123A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902930A (en) * 1972-03-13 1975-09-02 Nippon Musical Instruments Mfg Method of manufacturing iron-silicon-aluminum alloy particularly suitable for magnetic head core

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109943782B (zh) * 2017-12-20 2021-02-02 有研工程技术研究院有限公司 一种00Cr17Ni14Mo2不锈钢阀块的加工方法
CN113088750B (zh) * 2021-03-19 2022-03-25 宁波金田铜业(集团)股份有限公司 一种铜铁合金线材及其制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1452232A (en) * 1921-05-23 1923-04-17 American Metal Prod Alloy

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1452232A (en) * 1921-05-23 1923-04-17 American Metal Prod Alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902930A (en) * 1972-03-13 1975-09-02 Nippon Musical Instruments Mfg Method of manufacturing iron-silicon-aluminum alloy particularly suitable for magnetic head core

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Publication number Publication date
GB1137123A (en) 1968-12-18
DE1483271A1 (de) 1969-01-23
CH450733A (fr) 1968-01-31

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