Phase separation reactions in Ti–50V alloys

Abstract

Phase transformations in Ti–50V alloys containing oxygen in the range <0·095–0·36 wt-% have been studied at 750 and 400°C for times up to 1000 h. Results of electron microscopy, X-ray diffraction, and hardness testing indicate that oxygen widens the α+β phase field at 750°C and the metastable β phase miscibility gap at 400°C. The evidence is consistent with a phase diagram for high purity Ti–V alloys containing a stable α+β phase field with a β transus decreasing with increasing vanadium content. No evidence was obtained consistent with a β monotectoid form of diagram which has recently been proposed.

MST/1039