Abstract
High density sintered solid forms of Mg 2Ni hydride and Mg-5wt.%Ni alloy hydride were prepared using the cylindrical explosion shock compression technique. During such treatment, both hydrides lost about 10% of their hydrogen. The colour of the Mg 2NiH x product was black and uniform, and it was mainly composed of Mg 2NiH 4 and Mg 2Ni, with some MgNi 2 and MgH 2 phases. This material was hard and tough, and rather stable in air. On the contrary, the Mg-5wt.%NiH x product was greyish in colour, including white stripes and cracks. The sintering process did not proceed in the white part. This material was composed of MgH 2, magnesium metal and some Mg 2Ni phase. The Vickers hardness was 232 and 185 respectively. The porosity was 5.29% and 4.73%, and the hydrogen content was 3.33 wt.% (theoretically 3.73 wt.%) and 6.97 wt.% (7.88 wt.%). The former exhibited metallic conductivity, but the latter was a electrical insulator.
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