Damage process in commercially pure α-titanium alloy without (Ti40) and with (Ti40-H) hydrides

Abstract

The influence of hydrostatic stress and hydrogen content on damage process was investigated in α-titanium alloy. In particular, void site, void nucleation criterion, void nucleation, and void growth kinetics were experimentally determined. Void nucleation and growth rates and fracture process have been discussed using a Gurson-Tvergaard model. The main result is that void growth rate is not affected by hydride inclusions contrary to the void nucleation kinetic. In Ti40, the nucleation process has less influence than the growth process, which involves fracture. On the contrary, with regard to Ti40-H, the growth process is negligible and the nucleation kinetics, which is predominant, is the main cause of fracture.