La(Mg1-xAlx) (x =0.2, 0.4, 0.6, 0.8) alloys have been prepared using induction melting followed by annealing. It is found that partial substitution of Mg by Al does not lead to a change in crystal structure, and the alloys have a single LaMg phase when x ≤ 0.4. The lattice parameter of the LaMg phase decreases obviously after the partial substitution of Mg by Al. However, further substitution of Mg by Al leads to the coexistence of multiple phases when x ≥ 0.6. The alloys con- sist of the LaMg, LaAl, LaAl2, and La5Al4 phases. The LaMg phase decreases, whereas the La5Al4 phase increases with the increase in x. The Al-substituted La(Mg0.6Al0.4) alloy can be hydrogenated into the tetragonal LaH3, cubic LaH3, MgH2, and LaAl under 5 MPa at 473 K for 5 d.
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