Process for producing structural member of aluminum alloy

Details Process for producing structural member of aluminum alloy Process for producing structural member of aluminum alloy

1995-08-18

1997-09-02

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Pretreatment of consolidated powders

B22F 100

Patent

active

056628633

ABSTRACT:
A powder preform of aluminum alloy powder is subjected to a heating treatment and then to a compacting and hardening process under a pressure to produce a structural member of aluminum alloy. The aluminum alloy powder used is one having a non-equilibrium phase which shows a calorific value C in a range of C.gtoreq.10 J/g at a temperature-increasing rate of 20 K./min in a differential scanning calorimetry. In the heating treatment, the average temperature-rising rate R.sub.2 from a heat-generation starting temperature Tx (K.) of the aluminum alloy powder to Tx+A (wherein A.gtoreq.30 K.) is R.sub.2 .ltoreq.60 K./min. Thus, the change of the non-equilibrium phase in the powder preform is uniformly performed. In addition, the average temperature-increasing rate R.sub.4 from a processing temperature Tw (K.-B) in the compacting and hardening process to Tw (wherein B.gtoreq.30 K., and Tw-B>Tx+A) is R.sub.4 .gtoreq.60 K./min. Thus, the oxidation of the powder preform is reliably prevented.

REFERENCES:
patent: 5022918 (1991-06-01), Koike et al.
patent: 5145503 (1992-09-01), Horimura
patent: 5340659 (1994-08-01), Horimura
patent: 5360463 (1994-11-01), Horimura
patent: 5498393 (1996-03-01), Horimura et al.

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