La对Al-5Mg-0.2Zr合金组织和性能的影响  

Effect of La Elements on Microstructure and Mechanical Properties of Al-5Mg-0.2Zr Alloy

作　　者：余爱武 杨成刚[1] 何鹏[1,2] 刘奋成[1] 王善林[1] 

机构地区：[1]南昌航空大学航空制造工程学院 [2]哈尔滨工业大学先进焊接与连接国家重点实验室

出　　处：《特种铸造及有色合金》2014年第10期1106-1108,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51165038;51201087);江西省教育厅科技计划资助项目(GJJ13496;GJJ12453);航空科学基金资助项目(2011ZE56005);南昌航空大学研究生创新基金资助项目(YC2013005)

摘　　要：采用铸锭冶金法制备了含稀土La的Al-Mg-Zr合金,通过金相显微镜、扫描电镜、能谱和X射线衍射及力学性能测试,观察分析了0.2%的La微合金化对Al-5Mg-0.2Zr合金微观组织和力学性能的影响。结果表明,在Al-5Mg-0.2Zr合金中添加0.2%的La能显著细化合金晶粒,合金的平均晶粒尺寸下降到68μm,同时有效地避免了Al3Zr析出相的粗化和偏聚,使合金抗拉强度、屈服强度及伸长率分别增加到了165.5MPa、112.5MPa和7.5%。Al-Mg-Zr alloys containing La elements were prepared by cast metallurgy. Effects of 0.2 % La additions on mierostructure and mechanical properties of Al-5Mg-0.2Zr alloy were investigated by tensile testing, optical microscopy （OM）, scanning electron microscopy （SEM）, energy spectrum （EDS） and X-ray diffraction （XRD）. The results show that the addition of 0.2% La can positively refine the grain size of Al-5Mg-0.2Zr alloy and effectively avoid the coarsening and segregation of AI3Zr in the matrix, and the average grain size of the alloy is decreased to only 68μm. Meanwhile, the tensile strength, yield strength and elongation are increased to 165.5 MPa,112.5 MPa and 7.5%, respectively.

关 键 词：Al-5Mg-0.2Zr合金 微观组织 力学性能 晶粒尺寸 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]