ME21稀土镁合金薄板微观组织的多尺度研究  

Multi-scale study on microstructure of ME21 rare-earth magnesium alloy sheet

作　　者：陈明[1,3] 孙贺[1] 赵红阳 程明[3] 王瑞雪[3] 胡小东[2] 刘庆杰[1] 巨东英 CHEN Ming;SUN He;ZHAO HongYang;CHENG Ming;WANG RuiXue;HU XiaoDong;LIU QingJie;JU DongYing(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Institute of Advanced Science,Saitama Institute of Technology,Saitama Institute of Technology,Saitama 3690293,Japan)

机构地区：[1]辽宁科技大学机械工程与自动化学院,鞍山114051 [2]辽宁科技大学材料与冶金学院,鞍山114051 [3]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [4]埼玉工业大学先端科学研究所,埼玉3690293,日本

出　　处：《中国科学：技术科学》2022年第10期1571-1581,共11页Scientia Sinica(Technologica)

基　　金：国家自然科学基金青年基金(批准号:51305188);辽宁省教育厅资助项目(编号:2021LNZD06);辽宁省重点实验室开放课题(编号:USTLGCZX202005)资助项目。

摘　　要：为了获得细化的晶粒和弱化的基面织构,开发高性能镁合金薄板,利用多尺度计算模型对镁合金微观变形机制进行研究是非常必要的.本文采用有限元法对异步温轧工艺过程进行了数值计算,获得了等效塑性应变及应变速率结果,将此结果作为初始边界条件导入到微观黏塑性自洽模型VPSC(visco-plastic self-consistent)中,实现了宏微观多尺度的耦合计算.进一步利用电子背散射衍射EBSD(electron backscatter diffraction)技术对变形后样品的微观组织及织构进行表征,并采用VPSC模型确定了在温轧变形条件下的各滑移系及孪晶的相对开启量.结果表明,随着压下量的增加,并未发生基面织构强化,异步温轧工艺方式为开发稀土镁合金薄板甚至箔材提供了可能.不同的冷却方式下,水冷板材较空冷板材晶粒细化效果更加明显,综合力学性能更好.In order to obtain refined grains and weakened basal texture, it is very necessary to study the micro deformation mechanism of magnesium alloy by using multi-scale calculation model. In this work, the finite element method was used to simulate asymmetric warm rolling and calculate the equivalent plastic strain and strain rate. These terms were then used as the initial boundary condition and imported into the microviscoplastic self-consistent(VPSC) model. Macro-micro multiscale coupling was realized. The microstructure and texture of the deformed samples were characterized via electron backscatter diffraction, and the relative opening of each slip and twinning system was determined using the VPSC model. The results demonstrate that no basal surface texture strengthening occurs as the reduction is increased. The asymmetric warm rolling process provides the possibility to develop rare-earth magnesium alloy sheets or foils. Employing different cooling methods demonstrated that water-cooled sheets are more crystalline than air-cooled sheets with a more obvious grain refinement effect and better comprehensive mechanical properties.

关 键 词：稀土镁合金 多尺度模型 异步温轧 微观组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]