Dislocation-hydride interactions at low plastic strain in titanium

The influence of hydrostatic stress and hydrogen content on high plastic strain and damage process was investigated in α-titanium alloys. Observations at high plastic strain showed that hydrides can be sheared by twins and microshear bands without cavity formation. It was observed that hydrides enhanced the hardening process. This hardening corresponds to the internal stress × due to strain incompatibilities and the effect remains very weak. Transmission electron microscopy observations suggested that the hydrides could indeed experience plastic yielding. This plastic yielding process progressively reduces and finally eliminates the strain incompatibility due to hydride precipitates.