Preparation of Mg-Li-La alloys by electrolysis in molten salt  

熔盐电解制备Mg-Li-La合金(英文)

作　　者：ZHANG Mi-lin CAO Peng HAN Wei YAN Yong-de CHEN Li-jun 张密林;曹鹏;韩伟;颜永得;陈丽军(哈尔滨工程大学材料科学与化学工程学院,超轻材料与表面技术教育部重点实验室,哈尔滨150001)

机构地区：[1]Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第1期16-22,共7页中国有色金属学报（英文版）

基　　金：Projects (2009AA050702, 2011AA03A409, 2007CB200906) supported by Hi-tech Research and Development Program of China;Projects (21103033, 21101040, 21173060) supported the National Natural Science Foundation of China;Project (HEUCF201210002) supported the Fundamental Research Funds for the Central Universities, China

摘　　要：An electrochemical method was used to prepare Mg-Li-La alloys in a molten LiCl-KCl-KF-MgCl2 containing La2O3 at 943 K. The results showed preparation of Mg-Li-La alloys by electrolysis is feasible. The Mg-Li-La alloys were analyzed by means of X-ray diffraction （XRD）, optical micrograph （OM） and scanning electron microscopy （SEM）. XRD analysis indicates that α＋Mg17La2, α＋β＋Mg17La2 and β＋LaMg3 Mg-Li-La alloys with different lithium and lanthanum contents were obtained via galvanostatic electrolysis. The microstructures of typical α＋Mg17La2 and β＋LaMg3 phases of Mg-Li-La alloys were characterized by optical microscopy （OM） and scanning electron microscopy （SEM）. The analysis of energy dispersive spectrometry （EDS） shows that the element of Mg distributes homogeneously in the Mg-Li-La alloy and the element of La mostly exists at grain boundaries to restrain the grain growth rate due to the larger ionic radius and lower electronegativity compared with Mg.在温度为943K的LiCl-KCl-KF熔盐体系中添加不同浓度的La2O3和MgCl2直接电解制备Mg-Li-La合金。运用X射线衍射分析、扫描电子显微镜及能谱分析和金相显微镜对所得合金进行分析。结果表明,在熔盐体系中通过添加La2O3直接制备Mg-Li-La合金的方法是可行的。在电解过程中,温度不变,槽电压随着电流密度的增加而增加,而改变温度对于槽电压影响不大。X射线衍射分析结果表明,通过恒电流电解可以得到α+Mg17La2,α+β+Mg17La2和β+LaMg3三种不同镁、镧含量的Mg-Li-La合金。能谱分析结果表明,Mg元素在合金中分布均匀,然而La元素主要分布在晶界处与Mg形成金属间化合物。

关 键 词：Mg-Li-La alloys LA2O3 ELECTROLYSIS MICROSTRUCTURE 

分 类 号：TG146.22[一般工业技术—材料科学与工程]