Abstract
Bulk material of Ti5Si3 intermetallic compound had been produced successfully by powder metallurgical technique. However, it was still very brittle. In the case of brittle intermetallic compound like Ti5Si3, it has been believed that it is really effective to form ductile phase to improve the toughness and ductility. We chose b-Ti as the second phase, for it was able to realize at the room temperature with the activity of b stabilizer. Therefore, we add V as a ternary element of Ti-Si system. In this paper, effect of V addition on powder fabrication by mechanical alloying, and phase formation during heating were investigated. The composition of MA powder, we studied here, were Ti-32mol%Si (Ti5Si3+α-Ti composition) and Ti-32mol%Si-10mol%V (Ti5Si3+β-Ti composition). By reducing Si content, mechanical alloying process was enhanced with comparison to Ti5Si3 stoichiometric composition. Diffusion of Si into Ti during heating or V into Ti during MA process played an important role in silicide formation and b-Ti stabilization.
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