铸态及退火处理后La_(1.5)Mg_(0.5)Ni_(7.0)(TiNi_3)_(0.1)储氢合金相结构的研究  

Research on Phase Structure of La_(1.5)Mg_(0.5)Ni_(7.0)(TiNi_3)_(0.1) Hydrogen Storage Alloy in Casting and Annealing

作　　者：邓安强[1] 罗永春[2] 樊静波[1] 

机构地区：[1]宁夏大学机械工程学院,宁夏银川750021 [2]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2015年第3期99-101,共3页Hot Working Technology

基　　金：宁夏自然科学基金资助项目(NZ12133)

摘　　要：研究设计了La1.5Mg0.5Ni7.0(Ti Ni3)0.1储氢合金的成分,用高频感应熔炼炉熔炼了该合金,将铸态合金在真空管式炉中采用充入氩气气氛900℃退火处理,分别保温1、2、5、12 h后随炉冷却。对该合金进行XRD测试并用Rietveld方法拟合分析。结果表明,铸态和退火合金均由Ce2Ni7和Gd2Co7型的(La,Mg)2Ni7相以及La Ni5相组成。随着退火时间的增加,合金主相由(La,Mg)2Ni7相变为La Ni5相。同时,含有Mg元素的Ce2Ni7、Gd2Co7型相的晶胞体积呈减少趋势,而La Ni5相晶胞体积变化不大。The component of La1.5Mg0.5Ni7.0 （TiNi3）0.1 hydrogen storage alloys was designed. The alloy was smelted by using high frequency induction melting furnace. The castalloy was annealed at 900℃ for 1, 2, 5 or 12 h in vacuum tube furnace with argon atmosphere, then furnace cooling. The alloy was tested by XRD, and fitting analysis was carried out using the Rietveld method, The results indicate that the as-cast and annealed alloys are composed of Ce2Ni7 and Gd2Co7 type （La, Mg） 2Ni7 phase and LaNi5 phase composition. With the increase of annealing time, the main phase changes from （La,Mg）2Ni7 phase into LaNi5 phase. At the same time, the unit cell volume of Ce2Ni7 and Gd2Co7 type phase with Mg element reduces while the cell volume of LaNi5 phase changes little.

关 键 词：铸态 储氢合金 相结构 

分 类 号：TG27[金属学及工艺—铸造] TG269