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重点研究了热处理工艺对(LaNdPrMg)(NiCoAl)3.8合金相成分和电化学性能的影响。总结发现1323 K保温5 h急冷的热处理过程,在改善相成分方面,可以使合金中高容量的A5B19相丰度达到68%(质量分数),电化学性能测试表明,其最大放电容量达到400.9 mAh.g-1,电化学循环100周容量保持率达到82.44%。经分析认为,加热保温过程对改善储氢合金相结构的均匀性起到一定的作用,而急冷过程对改善储氢合金综合性能起到至关重要的作用。
The effects of heat treatment process on the phase composition and electrochemical performance of (LaNdPrMg) (NiCoAl) 3.8 alloy were investigated. The quenching heat treatment process of 1323 K for 5 h was summarized. The phase composition of A5B19 with high capacity could be improved by 68% (mass fraction) in improving phase composition. The electrochemical performance test showed that the maximum discharge capacity reached 400.9 mAh. g-1, electrochemical cycling capacity retention rate of 100 weeks reached 82.44%. The analysis shows that the heating and insulation process to improve the uniformity of the phase structure of hydrogen storage alloys play a role, and the quench process to improve the overall performance of hydrogen storage alloys play a crucial role.