采用磁悬浮感应熔炼法制备了Nd-Mg-Ni系储氢合金,重点研究了热处理工艺对合金相组成和电化学性能的影响.采用X射线衍射、扫描电镜和电化学测试系统研究了合金的相结构、显微结构及电化学性能.研究结果表明,Nd0.75 Mg0.25 Ni2.75 Al0.25合金经1173,1273,1373 K退火处理后,随着退火温度的升高,不同相间元素分布更加均匀,Mg元素的浓度差减小,主相Nd2Ni7六方相逐渐增加.电化学P-C-T曲线平台变平缓、平台压降低,电化学容量,倍率性能和荷电保持率有较大提升.对于Nd0.75 Mg0.25 Ni3.2 Al0.1合金,经1373 K,5h热处理后慢冷较快冷更利于Nd2 Ni7相的形成,慢冷试样中Nd2Ni7相可达92.31％,电化学性能更加优异,最大电化学容量为330.1 mA·g-1,循环100周容量保持率为92.2％.
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