退火工艺对轧制态Mg-Al-Ca-Mn-Zn合金组织和力学性能影响  

Effects of Annealing Process on Microstructure and Mechanical Properties of Mg-Al-Ca-Mn-Zn Magnesium Alloy Rolled Sheet

作　　者：方德俊 孙有平[1,2,3] 何江美 谢尚恒[1,2] 朱嘉欣 Fang Dejun;Sun Youping;He Jiangmei;Xie shangheng;Zhu Jiaxin(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology;Guangxi Earthmoving Machinery Collaborative Innovation Center;Guangxi Key Laboratory of Automobile Components and Vehicle Technology)

机构地区：[1]广西科技大学机械与汽车工程学院,广西柳州545006 [2]广西土方机械协同创新中心 [3]广西汽车零部件与整车技术重点实验室

出　　处：《特种铸造及有色合金》2023年第4期488-493,共6页Special Casting & Nonferrous Alloys

基　　金：广西高等学校高水平创新团队资助项目(桂教师范[2019]52号);柳州市科技计划资助项目(2021CBA0102);广西研究生教育创新计划资助项目(YCSW2021323)。

摘　　要：采用金相显微镜(OM)、X射线衍射(XRD)、拉伸试验机和扫描电镜(SEM)等,研究了多道次轧制Mg-1.2Al-0.4Ca-0.3Mn-0.3Zn镁合金板材在不同退火工艺下的微观组织和力学性能。结果表明,轧制后板材经退火处理后晶粒明显细化,孪晶基本消失;随着退火温度上升,平均晶粒尺寸缓慢增加,并且晶粒尺寸、分布逐渐均匀,适当延长保温时间对晶粒尺寸影响有限;第二相析出物随保温时间的延长而粗化增多,但经400℃退火后析出物明显变少;镁合金板材经退火处理后抗拉强度有所下降,但伸长率增加明显,在400℃退火180 min后力学性能理想,伸长率提高至19.86%,较轧制态提升了314%,板材抗拉强度略有下降,为237.2 MPa。The microstructure and mechanical properties of Mg-1.2Al-0.4Ca-0.3Mn-0.3Zn magnesium alloy rolled by multi-pass rolling under different annealing temperature and holding time were investigated by optical metallography(OM),X-ray diffraction(XRD),tensile testing machine and scanning electron microscope(SEM).The results show that after annealed treatment,the grain size and the number of twins are decreased greatly.The average grain size in the rolled alloy is increased slowly with the increase of annealing temperature,and the grain size and distribution gradually become uniform,and the effects of holding time prolong on the grain size can be ignored.The second phase is coarsened and increased with increasing in holding time,however the second phase almost disappear at 400 C annealed treatment.After annealing treatment for the magnesium alloy plate at 400'C for 180 min,the tensile strength of the plate is decreased slightly to 237.2 MPa and the elongation is increased significantly to 19.86%,which is 314%higher than the rolled state.

关 键 词：镁合金 退火处理 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]