Compositional dependence of hydrogenation properties in Ti
1+y(Fe
1−xMn
x)
1−y were investigated. The annealed alloys mainly showed B2 structure (CsCl) and some of them contained a small amount of secondary phase. The lattice constant of B2 phase increased and their equilibrium pressures decreased with increasing Mn or Ti content. Ti
50Fe
40Mn
10 and Ti
50Fe
35Mn
15 showed two distinct flat plateaus on pressure-composition isotherms. Ti
52Fe
28Mn
20 and Ti
53Fe
25Mn
22 also showed two distinct flat plateaus below certain temperatures. Above those temperatures, however, only their first plateau became slant without hysteresis keeping the second plateau flat. In addition, the first plateau was slanted without hysteresis even at room temperature in Ti
54Fe
23Mn
23. These results suggest that Ti
1+y(Fe
1−xMn
x)
1−y have critical temperatures for the first phase transformation from the α-solid solution phase to the β-Ti
1+y(Fe
1−xMn
x)
1−yH
~1 and they decreased with increasing Mn or Ti content.
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