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US3637441A Expired / Lapsed US ⏱️ 0.0 years remaining

Aluminum-copper-magnesium-zinc powder metallurgy alloys

Assignee: Alcoa Corp
•
Filing: 1970-03-02
•
Granted: 1972-01-25
•
Expires: 1990-03-02
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Abstract

Abstract Aluminum base powder metallurgy alloy article having an improved combination of high-transverse yield strength and high-stress corrosion cracking resistance. The alloy contains the basic precipitation hardening elements zinc, magnesium and copper plus dispersion strengthening elements iron and nickel. It may additionally contain chromium and/or manganese. The alloy is prepared by atomization of a melt of the elements, hot-working, solution heat treating, quenching and artificial aging. Components of the alloy in percent by weight are, in addition to the aluminum, from at least 6.5 to 13 zinc, 1.75 to 6 magnesium, 0.25 to 2.5 copper, 0.75 to 4.25 iron and 0.75 to 6 nickel, up to 3 manganese and up to 0.75 chromium. The iron to nickel ratio is from 0.2:1 to 2.0:1.

Inventors

  • 👤 John P Lyle Jr
  • 👤 Raymond J Towner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 03:45
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/10

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 29 words
The article of claim 1 wherein the aged condition results from heating at from about 225* to about 350* F. for from about 3 hours to about 100 hours.
Claim 2
Dependent Claim 48 words
The article of claim 1 wherein the aged condition results from heating first at from about 225* to about 275* F. for from about 6 to about 96 hours and then heating at from about 315* to about 350* F. for from about 3 to about 40 hours.
Claim 3
Dependent Claim 18 words
The article of claim 1 in which the Fe:Ni ratio of the alloy is from 0.2:1 to 2.0:1.
Claim 4
Dependent Claim 18 words
The article of claim 1 wherein the alloy also contains up to about 1.5 percent by weight Al2O3.

References Cited (Backward Citations)

US2506788A Cited
US3265493A Cited
US3291654A Cited
US3307978A Cited
US3198676A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-01-24 1975-07-26 1976-01-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-24 1979-07-26 1980-01-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-24 1983-07-26 1984-01-25 $7700.00 Window Closed / Lapsed

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