Back to Search
Start Over
Formation of a tetragonal phase hydride in Ti–Mo–H system
- Source :
-
Journal of Alloys & Compounds . Jun2008, Vol. 458 Issue 1/2, p161-165. 5p. - Publication Year :
- 2008
-
Abstract
- Abstract: The structural relationship between the hydride phases in Ti–Mo–H solid solution system (Mo content up to 15at% in the alloy) during dehydrogenation process under annealing has been studied by conventional and in situ X-ray powder diffraction and transmission electron microscopy (TEM) analysis. During dehydrogenation, the saturated hydrides of the Ti–Mo alloys with fcc δ-phase structure transfer into bcc β-phase at higher temperatures. An associated hydrogen concentration reduction for the δ-phase hydride is observed in the process. However, as the hydrogen concentrations decrease to certain values (H/M∼1.1–1.7), the unsaturated δ-phase formed at high temperature would become unstable at lower temperature, and transfer into a tetragonal phase (denoted the ɛ-phase here). Unlike that of the ɛ-phase in Ti–H system, the phase transition does not occur for the saturated δ-phase with hydrogen concentration close to the stoichiometric limit. The hydrogen concentration of this ɛ-phase hydride is in between that of the tetragonal γ and ɛ-phase in Ti–H system, but more close to the γ-phase. The occurrence region of this ɛ-phase expands along with the increase of the Mo content in the alloys. The phase has a lattice similar to that of the ɛ-phase in Ti–H system with corresponding fct unit-cell c/a <1. [Copyright &y& Elsevier]
- Subjects :
- *DEHYDROGENATION
*HYRIIDAE
*X-ray diffraction
*HYDROGEN
Subjects
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 458
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 32050785
- Full Text :
- https://doi.org/10.1016/j.jallcom.2007.03.090