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{1012}宽孪晶使基面织构明显减弱;20%热轧过程中则出现{1012}、{1011}-{1012}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。
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 {1012} twins generated in 10% hot-rolling process seriously weakens the basal texture,while two types of twins {1012} and {1011}-{1012} 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2010年第8期1447-1454,共8页
The Chinese Journal of Nonferrous Metals
基金
国家科技部"十一五"科技支撑计划资助项目(2006BAE04B02)
关键词
AZ31镁合金
热轧
变形机制
织构
AZ31 magnesium alloy
hot-rolling
deformation mechanism
texture
