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
左志雄 1韩宇翔 1蒋树农 1高永浩 1刘楚明 2陈志永1
作者信息
- 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
- 折叠
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{101ˉ2}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{101ˉ2}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{101ˉ2}孪生的启动将引起晶粒<0001>轴的变化,而柱面滑移主要影响<112ˉ0>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.
Abstract
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{101ˉ2}twinning dominate the deformation.Grains with<0001>axis close to the tensile axis(TA)are prone to activate{101ˉ2}twinning,and as the<0001>axis gradually deviates from TA,basal slip and prismatic slip are activated sequentially.The activation of basal slip and{101ˉ2}twinning will cause a change in the<0001>axis of the grain,while the prismatic slip mainly affects the orientation of the<112ˉ0>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Key words
Mg-Gd-Y-Zr-Er-Ag alloy/deformation mechanism/crystal orientation/mechanical properties引用本文复制引用
基金项目
湖南省重点研发计划资助项目(2023GK2020)
出版年
2024
NETL
NSTL
万方数据