Hydrogen absorption in as-cast bcc single-phase Ti-Al-Nb alloys

In this article, hydrogen absorption properties of bcc single-phased as-cast Ti-Al-Nb alloys near pseudo-binary section at about 50 at.% of Ti are considered. Possible reasons of enhancing hydrogen capacity with the increasing of Nb content from similar to 34 to similar to 42 at.% and decreasing Al content from similar to 13 to similar to 6 at.% are discussed. The alloys and corresponding hydrides have been characterized by X-ray diffraction. Ti-6 at.% Al-42 at.% Nb is found to absorb maximum hydrogen H/M = 1.88 (similar to 2.81 wt.%) to form a hydride at 500 degrees C temperature and 1.2 MPa. Beneficial effect of mild cold rolling deformation on hydrogen capacity is noted. All the studied compositions demonstrate good kinetics and absorb hydrogen quickly, within 20-30 min after activation. (C) 2010 Elsevier B.V. All rights reserved.