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本文研究了六种不同成份的Mg-Cu-Ni系合金的动力学性能及氢化物形成和分解的一些规律。试验结果表明,合金Mg_(0.833)Ni_(0.066)Cu_(0.095)Ml_(0.006)具有最佳的放氢动力学性能:在330℃,1大气压下,经30分钟可放氢气4.75wt％。在260℃,1大气压下,经60分钟可放氢气1.55wt％。表面分凝在亚表面所形成的活性Ni、Cu金属质点,特定方位的相界面和微裂纹,对改善合金的吸放氢动力学性能具有促进作用。基此,作者提出多元镁基合金吸放氢过程的“表面分凝和界面—微裂纹通道”模型。
In this paper, the kinetics of six different Mg-Cu-Ni alloys and some rules of hydride formation and decomposition were studied. The experimental results show that the optimal kinetics of hydrogen desorption is Mg_ (0.833) Ni_ (0.066) Cu_ (0.095) Ml_ (0.006): 4.75wt% hydrogen can be released after 30 minutes at 330 ℃ and 1 atmosphere. At 260 ℃, 1 atmosphere, after 60 minutes to release hydrogen 1.55wt%. Surface sub-coagulation in the subsurface formation of active Ni, Cu metal particles, the specific orientation of the phase interface and micro-cracks, to improve the hydrogen absorption and desorption hydrogen kinetics performance. Based on this, the authors propose a model of “surface segregation and interfacial-microcrack passage” in the hydrogen absorption and desorption process of multi-Mg-based alloys.