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 Al 3TiHx,. 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. ©2011 The Japan Institute of Metals.