Abstract
Four Ni-Co-Cr-Nb-V alloys containing varying amounts of vanadium were solution treated and then aged at 923, 1023 and 1123 K for various lengths of time. The structure of the solution treated alloys was single phase f c c. The presence of 1 wt% vanadium was adequate to promote the formation of metastableγ″ phase with a DO22 type of ordered b c t structure. An increase in ageing time and temperature, and a decrease in the vanadium/niobium ratio caused an increased amount of stableβ phase, with a Cu3Ti-type orthorhombic structure, to precipitate. The precipitation of the metastable phaseγ″ has been explained in terms of the Engel-Brewer correlation.
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