NiAl intermetallic alloy and article with improved high temperat

Details NiAl intermetallic alloy and article with improved high temperat NiAl intermetallic alloy and article with improved high temperat

1994-10-14

1996-05-14

Simmons, David A.

Metal treatment

Stock

Directionally solidified

148409, 148429, 415200, 416241R, C22C 1903

Patent

active

055163807

ABSTRACT:
A NiAl intermetallic alloy and article is provided with improved high temperature strength, particularly stress rupture strength, through the generation of a multiphase microstructure comprising a beta matrix and at least one precipitate phase. The strength properties and microstructure are the result of alloying with at least two elements selected from Ga, Hf, and optionally Ti, Zr, Ta, Nb, and V, in defined ranges. Preferred are at least two of the elements Ga, Hf, and Ti, and specifically preferred are all three. A specifically preferred form of the invention, in atomic percent, is about 45-59% Ni, about 0.02-0.5% Ga, about 0.2 to less than 1% Hf, about 0.1-10% Ti, with the balance A1 and incidental impurities.

REFERENCES:
patent: 2910356 (1959-10-01), Grala et al.
patent: 5116438 (1992-05-01), Darolia et al.
patent: 5116691 (1992-05-01), Darolia et al.
patent: 5167732 (1992-12-01), Naik
patent: 5215831 (1993-06-01), Darolia et al.
CAbs. 120:141287 1994.
J of the Korean Inst. of Met. & Mater V 31, No. 6 (1993) 810-817.

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