Y含量对La-Mg-Ni-Al合金相结构与电化学性能的影响  

Influence of Y content on phase structure and electrochemical performance of La-Mg-Ni-Al alloy

作　　者：董小平[1] 杨丽颖[1] 庞艳荣[1] 张建 田翔[1] 王翠表[1] 

机构地区：[1]河北大学质量技术监督学院,河北保定071002 [2]马钢集团南山矿业公司,安徽马鞍山243031

出　　处：《材料热处理学报》2017年第1期19-23,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51371094);河北大学实验中心开放项目(sy2015091)

摘　　要：为了改善La-Mg-Ni-Al合金的循环稳定性,用Y部分替代合金中La元素,用真空感应熔炼与950℃完全退火处理制备了La_(0.82-x)Y_xMg_(0.18)Ni_(3.35)Al_(0.15)(x=0~0.45)合金。采用XRD分析了合金的相结构,并测试了其电化学性能,分析了Y含量对合金相结构及电化学性能的影响。结果表明,Y部分替代La后,合金相结构除了主相LaNi_5、(La,Y,Mg)_2(Ni,Al)_7外,还有Ni_3Y相,Y元素导致主相晶胞体积减小。与不含Y合金相比,含Y合金的电化学性能相对较好。合适的Y含量替代改善合金电极的电化学性能,在本实验研究范围内,Y含量为0.25时的合金具有相对较大的放电容量,Y含量为0.35时的合金具有相对较好的循环稳定性。In order to improve the cycling stability of La-Mg-Ni-Al alloy,the partial substitution of Y for La was performed,La_（0.82-x）Y_xMg_（0.18）Ni_（3.35）Al_（0.15）（ x = 0- 0.45） alloys were fabricated by induction melting under vacuum and complete annealing at 950 ℃.Phase structure of the alloy was characterized by X-ray diffraction（ XRD）,the electrochemical performances of the alloys were measured and the effects of the replacement of La by Y on phase structure and electrochemical performances of the alloys were investigated.The results show that there is Ni_3Y phase after partial substitution of Y for La besides main phases including LaNi_5and（ La,Y,Mg）_2（ Ni,Al）_7phases,Y element induces the decrease of cell volume of the main phases.Comparing with free-Y alloy,the electrochemical performances of the alloys containing Y are better than those of the other.Suitable Y content can improve the electrochemical performances.In this experiment,discharge capacity of the alloy with Y content of 0.25 is higher than that of the other,however,the cycling stability of the alloy with Y content of 0.35 is better than that of the other.

关 键 词：Y含量 La-Mg-Ni-Al合金 相结构 电化学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]