Hydride formation in an Al-Li alloy on cathodic hydrogen charging
- Indian Inst. of Tech., Kanpur (India). Dept. of Materials and Metallurgical Engineering
Several types of aluminium lithium hydrides can form when aluminium and lithium react with hydrogen. Dickenson et al. reported the precipitation of LiH in the subsurface region of Al-Li alloys on annealing in dry air, dry hydrogen and wet air at 550 C. Balasubramaniam et al. unambiguously identified, by transmission electron microscopy (TEM), the presence of LiAlH{sub 4} in an Al-Li-Cu alloy under SCC conditions. In the present study, the phase changes that occur on room temperature cathodic hydrogen charging of an Al-Li-Cu-Mg alloy have been investigated by X-ray diffraction (XRD). The diffraction peaks of LiH and LiAlH{sub 4} occur at distinctly different locations, for example, the 100% peak for LiAlH{sub 4} occurs at 2{theta} = 22.9{degree} and the same for LiH occurs at 2{theta} = 44.4{degree}. Therefore, unambiguous identification of the hydride phase is possible.
- OSTI ID:
- 438608
- Journal Information:
- Scripta Materialia, Vol. 36, Issue 3; Other Information: PBD: 1 Feb 1997
- Country of Publication:
- United States
- Language:
- English
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