新型Mg-Al-Sn-RE镁合金的挤压特性及其组织和力学性能研究  

Studies on Extrusion Properties and Its Microstructure and Mechanical Properties of New Mg-Al-Sn-RE Magnesium Alloy

作　　者：王晶[1] 周运洪 张新建[1] 王震宏[1] 

机构地区：[1]中国工程物理研究院材料研究所,四川江油621900

出　　处：《热加工工艺》2016年第13期46-50,共5页Hot Working Technology

摘　　要：研究了热挤压的Mg-4Al-2Sn-0.5Y-0.4Nd变形镁合金组织与力学性能。结果表明,该合金能在挤压温度300℃和挤压速度20 m/min下挤压成形,并得到完全的动态再结晶组织。组织中的Al_2RE相在挤压过程中破碎并沿着挤压方向成流线分布,Al_2RE颗粒有利于促进动态再结晶的发生。挤压棒材存在(0002)〈1010〉纤维织构,其屈服强度、抗拉强度和伸长率分别达到185、270MPa和20%。Microstructure and mechanical properties of hot-extruded Mg-4AI-2Sn-0.5Y-0.4Nd wrought magnesium alloy were investigated. The results show that the alloy can be extruded at 300℃ and extrusion speed of 20 m/min.And full dynamic recrystallization microstructure is obtained. A12RE phase in the microstructure is fragmented and distributed along extrusion direction during extrusion. These Al2RE particles are favor to accelerate dynamic recrystaliization. The as-extruded bar possesses （0002） （1010） fiber texture. The yield strength, tensile strength and elongation reach 185,270MPa and 20% respectively.

关 键 词：镁合金 热挤压 显微组织 织构 力学性能 

分 类 号：TG379[金属学及工艺—金属压力加工]