US3761252A - Aluminum base alloy - Google Patents

Aluminum base alloy Download PDF

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Publication number
US3761252A
US3761252A US00297209A US3761252DA US3761252A US 3761252 A US3761252 A US 3761252A US 00297209 A US00297209 A US 00297209A US 3761252D A US3761252D A US 3761252DA US 3761252 A US3761252 A US 3761252A
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US
United States
Prior art keywords
alloy
silicon
aluminum base
cast
hardness
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Expired - Lifetime
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US00297209A
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English (en)
Inventor
Rourke R O
W Shrader
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Materion Brush Inc
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Materion Brush Inc
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Classifications

    • 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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Definitions

  • High silicon aluminum base alloys are well known.
  • a typical example of an aluminum base alloy is that which is shown and described in Pat. No. 2,830,173 and in Ser. No. 185,440 filed Sept. 30, 1971, now Pat. No. 3,716,355 dated Feb. 13, 1973.
  • Very often, the introduction of materials which reduce the grain size do so at the sacrifice of other properties.
  • materials which are added for one purpose may adversely affect another desired property.
  • Maintenance of relatively high as-cast hardness is important, particularly in the production of molds characterized by fine detail such as, for example, a wood grain pattern. Replicability of the pattern detail depends upon not only the hardness but also the ability of the alloys to reproduce fine detail.
  • These alloys are particularly useful in producing a cast-to-shape mold for foam molding of plastics to make simulated wood grain furniture parts and development of desirable properties upon submission to a thermal history hereinafter more particularly described.
  • the hardness of these alloys both at room temperature and after exposure to temperatures below 1,000 F. provides material which has excellent durability in actual molding operations performed at temperatures of the order of 300 F. to 500 F.
  • These alloys are light in weight and therefore provide more volume per unit cost and greater ease of transport and handling in molding operations. These alloys do not depend upon the use of any nickel component as in the case of Ser. No.
  • the ingredients of the alloy are sufiiciently inexpensive to make the cost attractive to plastic mold fabricators and plastic molders.
  • the achievement of hardness levels of the order of R 95 without heat treatment is attractive as it eliminates a cost producing operation and does not involve risk of distortion or oxidation of a finished part.
  • the present invention is in an aluminum base alloy characterized by high as-cast or initial hardness. These alloys are composed of from 8-13% silicon, 1.5 to 5.0% copper, 5.0 to 8.0% zinc, 0.5 to 1.5% magnesium, 0.01 to 0.20% beryllium, 0.01 to 0.30% titanium, trace amounts of impurities, and balance aluminum.
  • This invention also relates to a cast aluminum base alloy of the above composition cast at a temperature of from 1000 F. to 1300 F.
  • aluminum base alloys herein, we refer to those aluminum alloys which contain at least 70% aluminum.
  • aluminum as herein employed refers to the metal as commercially produced, which does contain some impurities, or to the elemental material. Where in the appended claims the balance of an alloy is said to be aluminum, it is intended that this expression shall permit the inclusion in the alloy composition of other elements which do not adversely affect the properties herein set forth as well as the usual impurities associated with aluminum.
  • trace as used herein contemplates 0.005% to 0.5% by weight.
  • a specific example of an alloy in accordance herewith has the following composition and is compounded as a melt in air at a temperature of from 1200 F. to 1450 F. maximum temperature in an induction furnace:
  • the foregoing metals are air melted in the induction furnace at a temperature which does not exceed 1450 F.
  • This alloy when cast at 1250 F. into a graphite mold and naturally aged has hardness of R (Rockwell E) 95.
  • the Brinell number at 500 kg. is 113; the ultimate strength in k.s.i. 35,000; the yield at 0.2% offset in k.s.i. 32,000; the percent elongation 1.0%; the percent IACS conductivity is 21.
  • this alloy shows a Rockwell E hardness of 105, a Brinell 500 kg. of 130, an ultimate strength in k.s.i.
  • the raw alloys of the present invention may be produced by known means.
  • the components in their elemental form may be melt-blended in air at temperatures of from 1200 to 1500 F. in an induction furnace or in a gas-fired furnace with mechanical agitation.
  • a commercial aluminum melt and to add to it a master batch of silicon and aluminum containing 50% silicon until a percentage of silicon in the combined melt yields the desired amount of silicon, e.g. an ultimate concentration of 10% by weight of silicon.
  • Beryllium can be added as Al-5Be or Cu-4Be master alloys or as copper beryllium scrap. Titanium can be added as Cu-6Ti master alloy. The other elements are frequently added as elemental materials.
  • the raw alloy may be cast into pigs at a temperature in the range of from 1200 to 1500 F.
  • the pigs undergo a thermal history such as that described above in order to develop within the alloy the desired properties brought about by the combination of various elements present in these improved alloys.
  • This thermal history includes casting the material into the master mold at a temperature generally between 1100 and 1300 F. and preferably in the range of from 1225 to 1275 F.
  • the cast product may then be solution treated in accordance with known practice for a period of 8 to 24 hours, for example 16 hours, at a temperature in the range of from 900 F. to 1000 F., for example 935 F., and thereafter liquid quenched, for example in water, from the solution treating temperature.
  • the liquid quenching agent may be water, ice water, boiling water, or oil.
  • the cast product may then be aged for a period of from 8 to 24 hours, e.g. 16 hours, at a relatively mild temperature in the range of from 300 F. to 600 F., for example 340 F.
  • the casting temperature not exceed about 1400 F. Best results are secured if the -final casting temperature is within the range of from 1200 F. to 1400 F.
  • An aluminum base alloy consisting of 8-13% silicon, 1.5 to 5.0% copper, 5 to 8% zinc, 0.5 to 1.5% magnesium, 0.01 to 0.20% beryllium, 0.01 to 0.30% titanium, impurities, and balance aluminum.
  • An aluminum base alloy consisting of 10.38% silicon, 2.56% copper, 7.26% zinc, 0.63% magnesium, 0.12% beryllium, 0.08% titanium, impurities, and balance aluminum.
  • An aluminum base alloy consisting of 10.18% silicon, 2.20% copper, 6.50% zinc, 0.61% magnesium, 0.12% beryllium, 0.16% titanium, impurities, and balance aluminum.
  • An aluminum base alloy consisting of 10.14% silicon, 2.22% copper, 6.80% zinc, 0.59% magnesium, 0.13% beryllium, 0.16% titanium, impurities, and balance aluminum.
  • An aluminum base alloy consisting of 9.82% silicon, 3.90% copper, 8.16% zinc, 0.50% magnesium, 0.14% beryllium, 0.11% titanium, impurities, and balance aluminum.
  • An aluminum base alloy consisting of 10.29% silicon, 2.88% copper, 6.75% zinc, 0.64% magnesium, 0.18% beryllium, 0.16% titanium, impurities, and balance aluminum.
  • a cast aluminum base alloy consisting of from 8- 13% silicon, 1.5 to 5.0% copper, 5 to 8% zinc, 0.5 to 1.5% magnesium, 0.01 to 0.20% beryllium, 0.01 to 0.30% titanium, impurities, and balance aluminum, and having the hardness Obtained by casting the alloy at a temperature between 1100 F. and 1300 F., solution treating for a period of from 8 to 24 hours at a temperature of from 900 to 1000 F water or oil quenching from the solution treatment temperature, and aging for a period of from 8 to 24 hours at a temperature in the range of from 300 F. to 600 F.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
US00297209A 1972-10-13 1972-10-13 Aluminum base alloy Expired - Lifetime US3761252A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29720972A 1972-10-13 1972-10-13

Publications (1)

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US3761252A true US3761252A (en) 1973-09-25

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Country Status (6)

Country Link
US (1) US3761252A (OSRAM)
JP (1) JPS4973316A (OSRAM)
DE (1) DE2335894A1 (OSRAM)
FR (1) FR2202949A1 (OSRAM)
GB (1) GB1385145A (OSRAM)
IT (1) IT1004546B (OSRAM)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364159A (en) * 1980-07-14 1982-12-21 Trw Inc. Method for manufacturing a forged piston with reinforced ring groove
US6719859B2 (en) 2002-02-15 2004-04-13 Northwest Aluminum Company High strength aluminum base alloy
CN105624487A (zh) * 2015-04-07 2016-06-01 Sj技术股份有限公司 压铸用铝合金及利用其的铝合金铸件的制备方法
CN109280820A (zh) * 2018-10-26 2019-01-29 中国航发北京航空材料研究院 一种用于增材制造的高强度铝合金及其粉末的制备方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364159A (en) * 1980-07-14 1982-12-21 Trw Inc. Method for manufacturing a forged piston with reinforced ring groove
US6719859B2 (en) 2002-02-15 2004-04-13 Northwest Aluminum Company High strength aluminum base alloy
CN105624487A (zh) * 2015-04-07 2016-06-01 Sj技术股份有限公司 压铸用铝合金及利用其的铝合金铸件的制备方法
CN109280820A (zh) * 2018-10-26 2019-01-29 中国航发北京航空材料研究院 一种用于增材制造的高强度铝合金及其粉末的制备方法
CN109280820B (zh) * 2018-10-26 2021-03-26 中国航发北京航空材料研究院 一种用于增材制造的高强度铝合金及其粉末的制备方法

Also Published As

Publication number Publication date
GB1385145A (en) 1975-02-26
DE2335894A1 (de) 1974-04-18
IT1004546B (it) 1976-07-20
JPS4973316A (OSRAM) 1974-07-16
FR2202949A1 (OSRAM) 1974-05-10

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