An investigation is reported of the precipitation of γ′ from supersaturated γ in model Ni based superalloys containing (at.-%) 75%Ni, 15 or 12·5%Al, 10 or 7·5%Mo, 2·5%Ta or Won aging in the range 1073–1373 K for periods up to 100 h. For short aging periods the γ/γ′ mismatch was positive, but on prolonged aging the y lattice parameter increased and that of γ′ decreased giving negative mismatch; this change is attributed substantially to the partitioning of Mo to γ.
MST/1047
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