The precipitation behavior of topological close-packed (TCP)μphase in powder metallurgy (P/M)nickel-based superalloy FGH97 was investigated.The results showed that proper addition of solution strengthening ele-ments,such as Co,Cr,W,Mo,improved tensile strength,while excessive addition of those elements facilitated the precipitation ofμphase,which seriously aggravated the plasticity of the P/M superalloy.For the heat-treated speci-mens,the relationship between critical aging time (whenμstarted to precipitate),aging temperature,and the aver-age electron vacancy number ofγmatrix was established.
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