Abstract
Hot compression tests were carried out on a TiC dispersed titanium alloy in the temperature range 923–1223 K with a strain rate of ∼0·1 s-1. Fracture behaviour was strongly dependent on temperature. The fracture strain of the alloy was raised from 40% (923 K) to 70% (1223 K), but these values are inferior to that of Ti–6Al–4V alloy. Fracture of the TiC dispersed titanium alloy occurred by the nucleation, growth, and coalescence of voids near the side surface (free surface) of the specimen. Most of the voids seemed to be nucleated from the cracking of TiC particles. The poor formability of this alloy was markedly improved by coating the specimen with a thin titanium tube. This result suggests that fracturing can be effectively suppressed if carbides near the specimen surface are removed.
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