Mm(NiMnTiCo)5贮氢合金的制备工艺、 电化学性能及相结构研究

用电化学测量、Ｘ射线衍射、透射电子显微镜和能谱分析等技术对不同工艺制备的Ｍｍ（ＮｉＭｎＴｉＣｏ）５贮氢合金的电化学性质和结构进行了详细研究。快淬技术如熔体喷带法可有效改善合金的循环稳定性，但却导致其活化速度和放电容量下降。合金在适当温度下回火可弥补以上不足。不同制备工艺造成合金电化学性能变化的原因在于相结构和显微组织的差别。

Manufacturing Process, Electrochemical Properties and Phase Structures of Mm(NiMnTiCo) 5 Hydrogen Storage Alloys

The electrochemical properties and phase structure of the Mm(NiMnTiCo) 5 hydrogen storage alloys prepared by different processing methods were investigated by electrochemical measurements, XRD, TEM and EDS. Rapid solidification such as melt spinning can improve the cycle stability of the alloy effectively, but it also leads to decreases in initial activation rate and discharge capacity. Annealing at a moderate temperature can make up for these above disadvantages. The variation of electrochemical properties for the same alloy prepared by different processing methods is caused by different phase structures and microstructures.