Properties of Mechanically Milled Nanocrystalline and Amorphous Mg–Y–Ni Electrode Alloys for Ni–MH Batteries

作     者：Yang-Huan Zhang Ze-Ming Yuan Tai Yang Zhong-Hui Hou Dong-Liang Zhao 

作者机构：Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal ResourcesInner Mongolia University of Science and Technology Department of Functional Material ResearchCentral Iron and Steel Research Institute 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2015年第28卷第7期

页      面：826-836页

核心收录：

学科分类：0808[工学-电气工程] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 

基　　金：supported by the National Natural Science Foundation of China (Nos.51161015 and 51371094) 

主　　题：Mg2Ni-type alloy Y substitution for Mg Milling time Electrochemical performance 

摘      要：Nanocrystalline and amorphous Mg2Ni-type Mg20-xYxNi10（x = 0,1,2,3 and 4） electrode alloys were fabricated using mechanical *** effects of the Y content and milling time on the microstructures and electrochemical performances of the alloys were investigated in detail.X-ray diffraction and transmission electron microscopy analyses revealed that the substitution of Y for Mg yields an obvious change in the phase composition and micro morphology of the *** the Y content x ≤ 1,the substitution of Y for Mg does not change the major phase Mg2 Ni,but with a further increase in the Y content,the major phase of the alloys transforms into the YMg Ni4 YMg3 phase.A nanocrystalline and amorphous structure can be obtained by mechanical milling,and the amorphisation degree of the alloy visibly increases with increased milling *** measurements indicate that the discharge capacity of the alloys first increases and then decreases with increasing Y content and milling *** substitution of Y for Mg dramatically ameliorates the cycle stability of the as-milled alloys,and the mechanical milling more or less impairs the cycle stability of the ***,the high rate discharge ability,electrochemical impedance spectrum,Tafel polarisation curves and potential step measurements indicate that the electrochemical kinetic properties of the as-milled alloys first increase and then decrease with increasing Y content and milling time.