Thermally unstable hydrides of titanium aluminide Ti3Al
Abstract
The hydrogen capacity of (Ti, Nb)3Al titanium aluminides subjected to mechanical activation in a hydrogen atmosphere has been studied. It has been shown that the application of this procedure allows one to prepare thermally unstable titanium aluminide (Ti3Al) hydrides with a high hydrogen content (to 2.6 wt %) at room temperature and normal pressure; in this case, no special requirements for the hydrogen purity are placed. The thermally unstable nanostructured Ti3Al hydrides were found to exhibit a higher hydrogen mobility as compared to that of the microcrystalline hydrides. Low niobium additions (to 2.1 at %) have been found to decrease the hydrogen capacity. Experiments on the preparation of bulk samples from the hydride powders obtained were performed.
- Publication:
-
Physics of Metals and Metallography
- Pub Date:
- April 2011
- DOI:
- 10.1134/S0031918X11030069
- Bibcode:
- 2011PMM...111..353K
- Keywords:
-
- Ti-Al-Nb alloys;
- mechanical activation in a hydrogen atmosphere;
- hydrogen capacity;
- phase composition;
- nanostructure;
- nuclear magnetic resonance;
- compaction of hydride powders