中文摘要：

研究了替代La元素后对RE1.5，Mg0.5，Ni，（RE=Y，Ce，Nd）型合金组织结构特征、储氢性能和腐蚀行为的影响．结果表明：RE1.5，Mg0.5，Ni7（RE=Y，Ce，Nd）型均为复杂的多相组织；利用Y，Ce，Nd替代La后均使合金的吸放氢平台提高，特别是Y和Ce元素的吸氢平台达到了11Mpa，导致Y，Ce难以放电；对合金浸泡后的氧含量及物相分析表明，Y，Ce，Nd替代后的腐蚀产物主要为Y（OH）3,CeO2，Nd（OH）3，且均不同程度的提高了合金本征的耐腐蚀性，其中Y元素替代的效果最为显著．

英文摘要：

The microstructure, hydrogen storage properties and degradation behaviors of RE1. 5 Mgo. 5 Niv （ RE = Y, Ce, Nd） alloy through complete substitution of rare earth elements Y, Ce, Nd for La were studied. The results indicate that the RE1.5 Mg0.5 Ni7 （ RE = Y, Ce, Nd） alloy was composed of complex multi-phase microstructure. After Y, Ce and Nd were used to replace La, the hydrogen absorption and desorption plateau of the alloy were improved, especially the hydrogen absorption plateau of Y1.5 Mgo.5 Ni7 and Ce1.5 Mgo.5 NiT were up to 11 Mpa, so that they were difficult to discharge. Analysis of the oxygen content of alloy and phase after immersion showed that the corrosive products are mainly Y （OH） 3, CeO2, Nd （OH） 3 after the substitution of Y, Ce, Nd, and the intrinsic anti-corrosion ability of the alloy improved in varying degrees ,while Y was the most significant.