Hydrogenation of Al₃Ti at High Pressure and High Temperature

Abstract

An Al₃Ti alloy was immersed in hydrogen at high pressures and high temperatures. An anomalous expansion of the Al₃Ti metal lattice was observed by in situ powder X-ray diffraction measurements at 625°C and 10 GPa, suggesting that Al₃Ti is hydrogenated to form Al₃TiH_x. The hydrogen content is roughly estimated to be x∼0.4. However, the formed hydride phase is dehydrogenated during depressurization, and cannot be recovered at ambient conditions.