(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 对AZ31镁合金铸轧板进行单道次热轧实验，利用光学显微镜、X射线和透射电镜对热轧过程中微观组织和织构的演变规律进行研究。结果表明：AZ31镁合金铸轧板具有较强的基面织构，当热轧变形量较小时，孪生是主要的变形机制；当热轧变形量较大时，位错滑移成为主要的变形机制；10%热轧态中出现的透镜状的 宽孪晶使基面织构明显减弱；20%热轧过程中则出现 、 两种不同形貌的孪晶；当变形量大于20%时，位错滑移大量开动，基面织构也显著增强，并在随后的退火过程形成细小均匀的再结晶组织。
关键字: AZ31镁合金；热轧；变形机制；织构
AZ31 magnesium alloy during hot-rolling process
（School of Materials Science and Engineering, Central South University, Changsha 410084, China）
Abstract:The single-pass hot-rolling was processed on the cast-rolled sheet of AZ31 magnesium alloy. The evolution of microstructure and texture was studied with OM, TEM and XRD. The results show that the cast-rolled sheet has a strong basal texture, and the main deformation mechanism is twinning in hot-rolling with small reduction while the dislocation slip becomes the main deformation mechanism in hot-rolling with large reduction. The thick lenticular twins generated in 10% hot-rolling process seriously weakens the basal texture, while two types of twins and with different morphologies are produced in 20% rolling process. As the rolling reduction exceeds 20%, the dislocation slip is activated in a wider range, thus intensifying the basal texture. And the fragmentation morphology produced in the rolling process transforms to equal-axis recrystallization grains in following annealing.
Key words: AZ31 magnesium alloy; hot-rolling; deformation mechanism; texture
