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1. The X-ray line profiles of hydrogenated Mg–30Al alloy
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lower 2θ values. The shift of reflections increased with the
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to be higher in -Mg17Al12 peaks than that of ␣-Mg peaks.
2. Hydrogenation of Mg–30Al alloy resulted in expanding of
phase lattices presented in the alloy causing a change in the
phase interplanar spacings, X-ray line broadening and crys-
tallitesize. Significantexpansionoccurredinthe-Mg17Al12
lattice, while a slight expansion observed in the ␣-Mg lattice.
3. The hydrogen was concentrated primarily in the in the -
Mg17Al12 phase during hydrogenation up to 12 h. Hydro-
genation beyond 12 h resulted in disappearance of ␣-Mg
and -Mg17Al12 phase peaks and formation of magnesium
hydride (MgH2) and aluminum phases in the Mg–30Al alloy.
4. Dehydrogenation followed hydrogenation resulted in
decreasing the lattice parameters of Mg–30Al alloy, decom-
position of MgH2 and reappearance of ␣-Mg and -
Mg17Al12 peaks as well as disappearance of Al peak through-
out the material X-ray diffraction patterns.
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