CAJ | 학술논문

在温度为943 K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.
재온도위943 K적LiCl-KCl-KF용염체계중첨가불동농도적La2O3화MgCl2직접전해제비Mg-Li-La합금.운용X사선연사분석、소묘전자현미경급능보분석화금상현미경대소득합금진행분석.결과표명,재용염체계중통과첨가La2O3직접제비Mg-Li-La합금적방법시가행적.재전해과정중,온도불변,조전압수착전류밀도적증가이증가,이개변온도대우조전압영향불대.X사선연사분석결과표명,통과항전류전해가이득도α+Mg17La2,α+β+Mg17La2화β+LaMg3삼충불동미、란함량적Mg-Li-La합금.능보분석결과표명,Mg원소재합금중분포균균,연이La원소주요분포재정계처여Mg형성금속간화합물.
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.