热挤压Mg-1Gd-0.75Er-0.5Zn-0.18Zr镁合金组织演变和变形机制研究  

Study on microstructure evolution and deformation mechanism of hotextruded Mg-1Gd-0.75Er-0.5Zn-0.18Zr magnesium alloy

作　　者：李昊 臧千昊 张云峰 王思蜀 冯迪[1] 陈洪美[1] LI Hao;ZANG Qianhao;ZHANG Yunfeng;WANG Sishu;FENG Di;CHEN Hongmei(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212100

出　　处：《江苏科技大学学报（自然科学版）》2024年第3期35-40,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：江苏省高校自然科学基金面上项目(22KJB430003);江苏科技大学博士科研启动项目(1062932105);江苏省研究生科研与实践创新计划项目(KYCX22_3792)。

摘　　要：以Mg-1Gd-0.75Er-0.5Zn-0.18Zr为对象,研究了均匀化退火对合金组织的影响,热挤压对织构和力学性能的影响.微观结构分析表明,500℃均匀化12 h后,与铸态合金相比,沿晶界析出的块状LPSO相明显减少,部分块状LPSO相转化为层片状LPSO相.在热挤压后,合金内的LPSO相会发生扭折变形来适应变形,动态再结晶机制为连续动态再结晶机制和PSN机制.挤压后合金的抗拉强度、屈服强度和断后伸长率分别为340 MPa、308 MPa和4.64%,力学性能的改善主要归因于强纤维织构的存在.Taking Mg-1Gd-0.75Er-0.5Zn-0.18Zr as the object,the effects of homogenization annealing on the microstructure,and hot extrusion on the texture and mechanical properties of the alloy were studied.The microstructure analysis shows that after homogenization at 500℃for 12 h,compared with the as cast alloy,the massive LPSO phase precipitated along the grain boundary is significantly reduced,and part of the massive LPSO phase is transformed into lamellar LPSO phase.After hot extrusion,the LPSO phase in the alloy will undergo kink deformation to adapt to the deformation.The dynamic recrystallization mechanism is continuous dynamic recrystallization mechanism and PSN mechanism.The tensile strength,yield strength and elongation after fracture of the extruded alloy are 340 MPa,308 MPa and 4.64%respectively.The improvement of mechanical properties is mainly attributed to the existence of strong fiber texture.

关 键 词：稀土镁合金 热挤压 热处理 织构 

分 类 号：TG379[金属学及工艺—金属压力加工]