Microstructure, texture and mechanical properties evolution of pre-twinning Mg alloys sheets during large strain hot rolling
Microstructure, texture and mechanical properties evolution of pre-twinning Mg alloys sheets during large strain hot rolling
复制标题
大应变热轧过程中预孪晶镁合金板的显微组织、织构和力学性能演变
DOI：
10.1016/j.msea.2015.12.059
复制
发表时间：
2016-02-08
期刊：
影响因子：
6.4
通讯作者：
Pan, Fusheng
中科院分区：
文献类型：
--
作者：
Guo, Fei;Zhang, Dingfei;Pan, Fusheng
通过在350℃轧制预压缩AZ31镁板，研究预孪晶工艺对镁合金板动态再结晶、织构和力学性能的影响。对两种不同初始织构成分的预压缩板进行单道次减薄60%的轧制观察。仔细研究了大应变轧制过程中的微观结构、织构和机械性能的演变。结果表明，预压缩过程极大地促进了动态再结晶。孪生结构比压缩过程中储存的预变形应变更能有效地增强动态再结晶。除了滑移之外，当预孪晶样品沿其压缩方向滚动时，解孪被认为是一种重要的变形模式。轧制前预孪晶样品的低温退火会阻碍解孪过程，导致屈服应力增加。垂直于预压缩方向轧制的样品的基底织构和平面各向异性大大减弱。预孪晶工艺提高了轧制板材的机械性能。 (C) 2015 Elsevier B.V. 保留所有权利。
The effect of pre-twinning process on dynamic recrystallization, texture and mechanical properties of Mg alloys sheets was investigated by rolling pre-compressed AZ31 Mg sheets at 350 degrees C. Two types of pre compressed sheets with different initial texture component were rolled by 60% thickness reduction in a single pass for observation. Microstructure, texture and mechanical properties evolution during large strain rolling were carefully investigated. The results show that dynamic recrystallization is greatly promoted by pre-compression process. Twin structures are more effective in enhancing dynamic re crystallization than pre-deformation strain stored during compression. Besides slip, detwinning is regarded as an important deformation mode when pre-twinning samples are rolled along their compression directions. Low temperature annealing of pre-twinning samples prior to rolling hinders detwinning process, resulting in an increase of yield stress. The basal texture and plane-anisotropy are greatly weakened in the sample rolled perpendicular to the pre-compression direction. The mechanical properties of rolled sheets were promoted by pre-twinning process. (C) 2015 Elsevier B.V. All rights reserved.