标题:
Mg-Gd-Y-Nd-Zr合金热变形过程中的组织与织构演变Microstructure and Texture Evolution of Mg-Gd-Y-Nd-Zr Alloy Hot Deformation
作者:
唐昌平, 成声亮, 李国栋
关键字:
Mg-Gd-Y合金, 热变形, 孪生, 再结晶, 织构Mg-Gd-Y Alloy, Hot Deformation, Twinning, Recrystallization, Texture
期刊名称:
《Material Sciences》, Vol.6 No.5, 2016-09-14
摘要:
采用金相显微观察、扫描电镜观察、能谱仪及织构测试等手段，研究了Mg-8Gd-4Y-Nd-Zr合金在热压缩过程中组织与织构的演变规律，结果表明：经塑性变形后，形成了基面平行于压缩面的基面织构，但在变形初期，由于变形温度高，基面滑移和棱柱面滑移系均可被激活，形成基面织构和棱柱面织构共存的织构组态；在随后的变形过程中，棱柱面织构发生拉伸孪生，孪晶带的基面接近平行于压缩面，且孪晶界诱发动态再结晶，导致基面织构逐渐增强而棱柱面织构逐渐减弱。
Microstructure and texture evolution of Mg-8Gd-4Y-Nd-Zr alloy during hot compression were in-vestigated using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and texture testing. The results indicated that the basal texture was formed after deformation. However, both the basal slip and prismatic slip systems were activated due to the high deformation temperature, and the basal texture was coexisted with the prismatic texture. Then, twinning occurred in the grains with prismatic orientation, and the basal plane of the twin-ning zone was approximately parallel to the compression plane. The dynamic recrystallization was then occurred at the twin boundaries, which also resulted in the formation of basal texture.