High density sintered solid forms of Mg2Ni 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 Mg2NiHx product was black and uniform, and it was mainly composed of Mg2NiH4 and Mg2Ni, with some MgNi2 and MgH2 phases. This material was hard and tough, and rather stable in air. On the contrary, the Mg-5wt.%NiHx 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 MgH2, magnesium metal and some Mg2Ni 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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