Hydriding/dehydriding properties of Mg-Ni-based ternary alloys synthesized by mechanical grinding

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. B07; pp. 624 - 629
• Main Author: 陈玉安 杨丽玲 林嘉靖 程绩 潘复生
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China; National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China%College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
• Subjects: Alloys; China; enthalpy change; hydriding properties; Hydrogen storage; Intermetallic compounds; Magnesium; Magnesium base alloys; Mathematical analysis; mechanical grinding; Mg-Ni-based hydrogen storage alloy; p- C- T measurement; Phases; Ternary alloys; X射线衍射分析; 三元合金; 合金性能; 放氢性能; 机械研磨; 氢化动力学; Mg-Ni-based hydrogen storage alloy; hydriding properties; p- C- T measurement; mechanical grinding; enthalpy change; p-C-T measurement
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60551-1

The Mg-Ni-based ternary alloys Mg2-xTixNi（x=0,0.2,0.4）and Mg2Ni1-xZrx（x=0,0.2,0.4）were successfully synthesized by mechanical grinding.The phases in the alloys and the hydriding/dehydriding properties of the alloys were investigated.Mg2Ni and Mg are the main hydrogen absorption phases in the alloys by XRD analysis.Hydriding kinetics curves of the alloys indicate that the hydrogen absorption rate increases after partial substitution of Ti for Mg and Zr for Ni.According to the measurement of pressure-concentration-isotherms and Van’t Hoff equation,the relationship between ln p（H2）and 1 000/T was established.It is found that while increasing the content of correspondingly substituted elements at the same temperature,the equilibrium pressure of dehydriding increases,the enthalpy change and the stability of the alloy hydride decrease.