K. Ishikawa et al., Effect of substitutional elements on the hydrogen absorption-desorption properties of Ti3Al compounds, J ALLOY COM, 314(1-2), 2001, pp. 257-261
Ternary elements M were substituted into Ti3Al with the aim of reducing the
hydrogen desorption temperature of Ti,AIH,. On hydrogenation at room tempe
rature, three different states, i.e. amorphous, bce and C14 Laves phases, w
ere obtained depending on the alloying elements and their amount. The amorp
hous hydrides formed in the alloys substituted with Zr or Hf showed a high
hydrogen capacity and high hydrogen desorption temperature. in the case of
the bce hydrides, formed in the alloys substituted with V or Cr, the hydrog
en capacity was largely reduced, but the hydrogen desorption temperature wa
s unchanged or increased. Therefore,V and Cr are the worst substitutional e
lements to Ti3Al. On the other hand, the hydrides having C14 Laves structur
e formed in the alloys substituted with Mn, Co or Ni showed a reduced hydro
gen desorption temperature, although the hydrogen capacity was decreased to
same extent. From the present work, Mn, Co and Ni are considered to be eff
ective elements for improvement of the hydrogen absorption-desorption prope
rties of Ti3Al. (C) 2001 Elsevier Science BN. All rights reserved.