Heat treated single crystal articles and process

Details Heat treated single crystal articles and process Heat treated single crystal articles and process

C - Chemistry, Metallurgy

22

F

148/55.1, 148/3.

C22F 1/10 (2006.01)

Patent

CA 1184097

ABSTRACT OF THE DISCLOSURE An alloy composition casting scheme and specific heat treatment process are described for the production of directionally solidified single crystal articles which have exceptional properties. The alloy is based on the Ni-Al-Mo system, preferably with additions of Ta. The process for producing the article inclused directional solidification at a high rate to produce a fine dendritic microstructure. A combined homogenizing and solution treatment is performed to provide a unique chemically homogeneous single phase microstructure. This homo- geneous article is rapidly quenched and then aged at an intermediate temperature to develop a controlled uniform distribution of fine gamma prime phase particles.

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