高Y添加量对Mg-2Zn-1Mn合金组织和力学性能的影响  

Effect of High Y Addition on Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy

作　　者：罗宇伦 张丁非[1,2] 华建荣 代啟敏 钟诗宇 胥钧耀[1,2] 胡光山[3] 蒋斌[1,2] 潘复生[1,2] Luo Yulun;Zhang Dingfei;Hua Jianrong;Dai Qimin;Zhong Shiyu;Xu Junyao;Hu Guangshan;Jiang Bin;Pan Fusheng(College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing University,Chongqing 400044,China;College of Information Science and Engineering,Jiaxing University,Jiaxing 314001 China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆大学国家镁合金材料工程技术研究中心,重庆400044 [3]嘉兴学院信息科学与工程学院,浙江嘉兴314001

出　　处：《稀有金属材料与工程》2023年第1期54-62,共9页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program of China(2019YFC1520303);Natural Science Foundation of Zhejiang Province(LQ18E010003);Chongqing Science and Technology Commission(cstc2019jscx-mbdxX0031)。

摘　　要：采用光学显微镜、X射线衍射仪、X射线荧光法、电子探针显微分析仪、扫描电子显微镜、电子背散射衍射、透射电子显微镜和单轴拉伸测试等对Mg-2Zn-1Mn-xY(x=0,1,3,5,7,质量分数,%)合金的显微组织和力学性能进行研究。结果表明:随着Y元素的加入,铸态合金的第二相由Mg7Zn3转变为Mg_(3)Zn_(3)Y_(2),最终转变为Mg_(12)ZnY。Y元素的加入阻碍了动态再结晶的生长过程,使晶粒得到细化,但是进一步增加Y含量不会继续增强晶粒细化程度。挤压态Mg-2Zn-1Mn合金加入Y元素后,塑性呈现出先升高后下降的趋势,这可能是受到了织构取向变化和晶粒粗化的共同影响。此外,合金强度提高主要是由于细晶强化和第二相强化作用。Mg-2Zn-1Mn-7Y合金具有最佳的力学性能,其抗拉伸强度为357 MPa,屈服强度为262 MPa,延伸率为14%。The microstructure and mechanical properties of Mg-2Zn-1Mn-xY(x=0,1,3,5,7,wt%)alloy were studied by optical microscope(OM),X-ray diffractometer(XRD),X-ray fluorescence spectrometer(XRF),electron probe microanalyzer(EPMA),scanning electron microscope(SEM),electron backscatter diffractometer(EBSD),transmission electron microscope(TEM),and uniaxial tensile tests.Results show that the secondary phases of as-cast alloys are changed from Mg7Zn3 to Mg_(3)Zn_(3)Y_(2)and finally transformed to Mg_(12)ZnY with the addition of Y element.Although Y addition hinders the dynamic recrystallization process and therefore refines the grains,the excess Y addition cannot further refine the grains.Meanwhile,the ductility of as-extruded Mg-2Zn-1Mn alloy is increased and then decreased with the addition of Y element,which may be attributed to the synergistic effect of texture orientation and grain coarsening.Besides,the strength enhancement is mainly attributed to grain refinement strengthening and secondary phase strengthening.The Mg-2Zn-1Mn-7Y alloy has the optimal mechanical properties:the ultimate tensile strength is 357 MPa,yield strength is 262 MPa,and elongation is 14%.

关 键 词：Mg-Zn-Mn-Y 组织 性能 织构 

分 类 号：TG146.22[一般工业技术—材料科学与工程]