Mg-Gd-Y-Zr-Er-Ag合金模锻件各向异性拉伸变形行为  

Anisotropic tensile deformation behavior of Mg-Gd-Y-Zr-Er-Ag alloy die forgings

作　　者：左志雄 韩宇翔 蒋树农[1] 高永浩[1] 刘楚明 陈志永[1] ZUO Zhixiong;HAN Yuxiang;JIANG Shunong;GAO Yonghao;LIU Chuming;CHEN Zhiyong(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Hunan Meiyu Science and Technology Co.,Ltd.,Yueyang 414000,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]湖南镁宇科技有限公司,岳阳414000

出　　处：《中国有色金属学报》2024年第9期2919-2932,共14页The Chinese Journal of Nonferrous Metals

基　　金：湖南省重点研发计划资助项目(2023GK2020)。

摘　　要：通过等温模锻制备了大规格的Mg-Gd-Y-Zr-Er-Ag合金锥形壳体,分别沿壳体法向(ND)、周向(CD)和轴向(AD)对其进行室温拉伸实验,并对其变形行为进行深入分析。结果表明:柱面滑移起主导作用的AD和CD样品的屈服强度、抗拉强度比基面滑移与{1012}孪生主导变形的ND样品更高。〈0001〉轴靠近拉伸轴(TA)的晶粒易于启动{1012}孪生,随着〈0001〉轴逐渐偏离TA,基面滑移和柱面滑移依次启动。基面滑移与{1012}孪生的启动将引起晶粒〈0001〉轴的变化,而柱面滑移主要影响〈1120〉轴的取向。在不同变形机制的综合作用下,拉伸样品的{0001}极进一步偏离TA。Mg-Gd-Y-Zr-Er-Ag alloy conical shell was prepared by isothermal die forging.Room temperature tensile experiments were carried out along the normal direction(ND),circumferential direction(CD),and axial direction(AD)of the shell,and their deformation behavior was analyzed in depth.The results show that the yield strength and ultimate tensile strength of AD and CD samples in which prismatic slip plays a dominant role is higher than that of ND samples in which basal slip and{1012}twinning dominate the deformation.Grains with〈0001〉axis close to the tensile axis(TA)are prone to activate{1012}twinning,and as the〈0001〉axis gradually deviates from TA,basal slip and prismatic slip are activated sequentially.The activation of basal slip and{1012}twinning will cause a change in the〈0001〉axis of the grain,while the prismatic slip mainly affects the orientation of the〈1120〉axis.The combined effect of different deformation mechanisms results in that the{0001}pole of the tensile sample further deviates from TA.

关 键 词：Mg-Gd-Y-Zr-Er-Ag合金 变形机制 晶体取向 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]