Microstructure and mechanical properties of Mg-14Li-1Al-0.3La alloys produced by two-pass extrusion  

作　　者：Ruihong Li Bin Jiang Zhijun Chen Fusheng Pan Zhanyong Gao 

机构地区：[1]School of Materials and Metallurgy, Inner Mongolia University of Science and Technology [2]College of Materials Science and Engineering, Chongqing University [3]Chongqing Academy of Science and Technology [4]The Tenth Sub-company, Inner Mongolia First Machinery Group Corporation

出　　处：《Journal of Rare Earths》2017年第12期1268-1272,共5页稀土学报（英文版）

基　　金：Project supported by Natural Science Foundation of Inner Mongolia,China(2015BS0512)

摘　　要：The microstructure of as-cast and extruded Mg-14 Li-1 Al-（0, 0.3） La alloys was examined with XRD,OM, SEM, and EDS. The mechanical properties of the extruded specimens with and without La were compared. The results show that La addition has an obvious effect on the microstructure of the as-cast LA141 alloy by reducing the average grain size from 600 to 220 μm. β-Li and LiMgAl2 phases are observed in both alloys, and long-rod-shaped Al2 La phase is also observed in the La containing alloy. After extrusion, Al2 La phases are short-rod-shaped and distribute evenly in the alloy. LAl41-0.3 La alloy has higher elongation（34%）, which is attributed to refined microstructure and weak texture due to shortrod-like Al2 La phase.The microstructure of as-cast and extruded Mg-14 Li-1 Al-（0, 0.3） La alloys was examined with XRD,OM, SEM, and EDS. The mechanical properties of the extruded specimens with and without La were compared. The results show that La addition has an obvious effect on the microstructure of the as-cast LA141 alloy by reducing the average grain size from 600 to 220 μm. β-Li and LiMgAl2 phases are observed in both alloys, and long-rod-shaped Al2 La phase is also observed in the La containing alloy. After extrusion, Al2 La phases are short-rod-shaped and distribute evenly in the alloy. LAl41-0.3 La alloy has higher elongation（34%）, which is attributed to refined microstructure and weak texture due to shortrod-like Al2 La phase.

关 键 词：Mg-Li alloy As-cast Extrusion Microstructure Tensile properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG379[金属学及工艺—金属材料]