组织与织构演变
(中南大学 材料科学与工程学院,长沙 410083)
摘 要: 采用金相显微镜、扫描电镜和X射线衍射仪,对Mg-7Gd-4Y-1Nd-0.5Zr合金铸锭在450 ℃条件下轧制变形过程中的微观组织和织构演变规律进行研究。结果表明:该合金在轧制过程中存在着两种织构组分:基面织构和棱柱面织构。随变形程度的增加,基面织构不断增强,棱柱面织构不断减弱。在450 ℃条件下轧制时,棱柱面滑移系启动协调晶粒的塑性变形形成棱柱面织构,形成的棱柱面织构组分在后续变形过程中通过 < >孪生及退火过程中孪生区域的静态再结晶而不断被削弱。
关键字: 滑移系;孪生;织构;再结晶
Mg-7Gd-4Y-1Nd-0.5Zr alloy during hot rolling
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract:The microstructure and texture evolution of Mg-7Gd-4Y-1Nd-0.5Zr alloy during hot rolling at 450 ℃ were investigated by means of OM, SEM and XRD. The results show that there exist two components of textures: basal texture and prismatic texture. The basal texture becomes stronger and stronger and the prismatic texture becomes weaker and weaker with increasing the strain. The prismatic texture is formed by the initiation of the prismatic slip system in the grains with particular orientations, the prismatic texture is weakened by < > twinning and static recrystallization twinning-induced during annealing.
Key words: slip system; twinning; texture; recrystallization