稀土La对钼合金组织和性能的影响  

Effect of La on microstructure and mechanical property of Mo-alloy

作　　者：刘拼拼[1] 范景莲[1] 成会朝[1] 李勇明[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金技术》2009年第3期185-188,共4页Powder Metallurgy Technology

基　　金：国家自然科学基金创新研究群体科学基金资助项目(50721003)

摘　　要：以仲钼酸铵(NH4)6Mo7O24.4H2O和硝酸镧La(NO3)3.6H2O为原料,采用溶胶-喷雾干燥制备Mo-La合金,利用XRD、SEM以及EDS等分析了稀土La在粉末和合金中的存在形式,以及稀土La对钼合金的力学性能与组织结构的影响。结果表明,在粉末中稀土La以La2O3形式存在;在合金中,超细第二相粒子均匀分布在钼晶粒的晶内和晶界。稀土La的添加明显细化了Mo晶粒,抑制了晶粒的异常长大。Mo-La alloy has been prepared by sol-spray drying method with （NH4 ）6Mo7O24·4H2O and La（ NO3 ）3·6H2O as the raw materials. The form of La in complex powder and sintered Mo-alloy have been studied by XRD,SEM and EDS, and effects of lanthanum on microstructure and mechanical property have also been investigated. The results show that La2O3 can be observed in complex powder and second particles containing La distribute homogeneoully in sintered La-Mo alloy. The grain size of La-Mo alloy is refined and abnormal grain growth is inhibited by the second particles.

关 键 词：稀土La 喷雾干燥 掺杂 细化 

分 类 号：TG146.412[一般工业技术—材料科学与工程] TQ153.1[金属学及工艺—金属材料]