两道次挤压Mg-5Li-1Al镁锂合金的力学性能及成形性  

Mechanical properties and formability of two-pass extruded Mg-5Li-1Al alloy sheet

作　　者：冯效琰 李瑞红[1] 张晓梅 杨海梅 陈志军 金自立[1] 任慧平[1] FENG Xiaoyan;LI Ruihong;ZHANG Xiaomei;YANG Haimei;CHEN Zhijun;JIN Zili;REN Huiping(Materials and Metallurgy School,Inner Mongolia University of Science and Technology,Baotou 014010,China;Ministry of Quality,Safety and Environmental Protection,Inner Mongolia First Machinery Group Corporation,Baotou 014030,China;The Tenth Sub-Company,Inner Mongolia First Machinery Group Corporation,Baotou 014030,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古第一机械集团有限公司质量安全环保部,内蒙古包头014030 [3]内蒙古第一机械集团有限公司第十分公司,内蒙古包头014030

出　　处：《内蒙古科技大学学报》2020年第2期149-153,176,共6页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自治区自然科学基金资助项目(2019MS05037);教育部春晖计划资助项目(CHJH2018).

摘　　要：通过280℃双道次挤压成功制备了一种高性能Mg-5Li-1Al(质量分数,%)镁锂合金板材,该板材可以实现常温变形.对其组织、织构、力学性能和成形性能做了详细研究.结果表明:在双道次挤压过程中,动态再结晶充分,合金板材的组织均匀细小,从而使板材具有较好的成形性能(断裂延伸率为34%,Erichsen值4.82).这是由于LA51合金所具有的弱基面织构与较高的加工硬化指数所导致的.The deformation of common Mg alloys is difficult,and the Mg-5Li-1Al(mass fraction,%)alloy sheet with good strength-ductility balance was successfully fabricated by two-pass extruded at 280℃,with good formability.The microstructural evolution,texture,mechanical properties and stretch formability of the extruded sheets were investigated.The results show that a refined microstructure can be obtained by two-pass extrusion due to the dynamic recrystallization(DRX).The extruded sheet exhibits excellent formability with elongation to failure(FE)of 34% and Erichsen value of 4.82.The superior mechanical properties can be attributed to the ultrafine DRX grains and weaken basal texture resulted from the lithium addition.

关 键 词：镁锂合金 成形性 织构 塑性 挤压 

分 类 号：TG146.22[一般工业技术—材料科学与工程]