Thermal Stability of Amorphous Hydride Mg₅₀Ni₅₀H₅₄ and Mg₃₀Ni₇₀H₄₅

Quanmin YANG;Yongquan LEI+;Changpin CHEN;Jing WU;Qidong WANG, Dept. of Mater. Sci. and Eng., Zhejiang Univresity, Hangzhou, 310027, China

摘 要：<正> The thermal stability of amorphous ternary hydrides Mg₅₀Ni₅₀H₅₄ and Mg₃₀Ni₇₀H₄₅ and their corre-sponding amorphous binary alloys Mg₅₀Ni₅₀ and Mg₃₀Ni₇₀ were studied with X-ray diffraction（XRD） and differential scanning calorimetry（DSC）. Samples of the amorphous alloys were preparedby mechanical alloying and the amorphous hydrides were obtained by charging the alloys with gas-eous hydrogen at 3.0 MPa and 423 K. It was found that the amorphous hydrides released most oftheir hydrogen before the crystallization of the essentially hydrogen depleted amorphous alloy. Thecrystallization temperature of amorphous Mg₅₀Ni₅₀H₅₄ elevated and that of amorphousMg₃₀Ni₇₀H₄₅ did not change in relation to the original binary amorphous alloy. This is very excep-tional for amorphous hydrides. The reason for the effects of hydrogen absorption/desorption on thecrystallization of amorphous alloys was discussed.

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