Effect of hydrogen on the superplasticity of Ti40 alloy with large grains

Abstract Thermohydrogen processing (THP) is an attractive approach which uses hydrogen as a temporary element in titanium alloys to modify the microstructure/mechanical properties and workability. In this article, the influence of hydrogen on the superplasticity of single β phase Ti40 (Ti–25V–15Cr–0.2Si) alloy with hydrogenation had been investigated in the temperature range of 840–920 °C and strain rate of 5 × 10 −4 –1 × 10 −2  s −1 . The maximum elongation of 478% was obtained at 920 °C, 5 × 10 −4  s −1 with 0.3 wt.% H. A significant refinement of average grain size in Ti40– x H alloys during superplastic deformation was found and the grain sizes became much finer with the increase of hydrogen content. The superplastic deformation mechanism of Ti40– x H alloy with large grains could be explained by dynamic recovery and recrystallization.

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