Powder forging method of aluminum alloy powder having high proof

Details Powder forging method of aluminum alloy powder having high proof Powder forging method of aluminum alloy powder having high proof

1994-07-26

1996-03-12

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 32, 419 33, 419 38, 419 47, 419 48, B22F 317

Patent

active

054983932

ABSTRACT:
An aluminum alloy powder or a green compact thereof is prepared, wherein: (1) the composition formula is Al.sub.100-a-b Fe.sub.a X.sub.b where a and b in atomic % are 4.0.ltoreq.a.ltoreq.6.0, 1.0.ltoreq.b.ltoreq.4.0, and where X is at least one alloy element selected from Y and Mm (mish metal); or (2) the composition formula is Al.sub.100-a-b-c Fe.sub.a Si.sub.b X.sub.c, where a, b and c in atomic % are 3.0.ltoreq.a.ltoreq.6.0, 0.5.ltoreq.b.ltoreq.3.0, and 0.5.ltoreq.c.ltoreq.3.0, and where X is at least one alloy element selected from Ti, Co, Ni, Mn and Cr, and wherein both (1) and (2) include an amorphous phase of at least 1% by volume. The aluminum alloy powder or the green compact thereof is heated at a temperature increasing at a rate of at least 80.degree. C./min. to a predetermined temperature of at least 560.degree. C. and not more than a temperature at which 10% by volume of a liquid phase is contained in the alloy powder or green compact. The aluminum alloy powder or the green compact thereof is powder forged at the predetermined temperature. As a result, an aluminum alloy superior in static strength and dynamic strength can be produced.

REFERENCES:
patent: 5312494 (1994-05-01), Horimura et al.
"Ultrahigh Mechanical Strengths of Al.sub.88 Y.sub.2 Ni.sub.10-x M.sub.x (M=Mn, Fe or Co) Amorphous Alloy . . . " by Kim et al., Materials Transactions, JIM, vol. 32, No. 7(1991). pp. 599 to 608.
"Mechanical properties of Al.sub.88 (Y.sub.1-x Ce.sub.x).sub.2 Ni.sub.9 Fe.sub.1 (x=0, 0.5, 1) amorphous alloys . . . " by Kim et al., Research Report, vol. 42, No. 4, pp. 217 to 223.

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