摘要
基于EBSD和滑移迹线分析,在晶粒尺度上对轧制纯镁板材室温压缩过程中的滑移/孪生激活规律以及他们之间的交互作用进行统计研究(~400个晶粒)。10%变形后的结果表明,基面滑移(89%)是主要的滑移模式,所有鉴别出来的363个孪晶为拉伸孪晶。上凹形的应力-应变曲线表明变形由孪生主导,高的孪生面积分数(41%)进一步验证上述结论。大多数孪晶变体(79%)遵循施密特定律,孪晶转移与Luster-Morris参数(m’)并没有很好的相关性,然而大多数孪晶转移(82%)表现出较大的归一化施密特因子(m)和m’值。在孪晶内观察到滑移系的激活且符合施密特定律。此外,还观察到滑移迹线穿过孪晶界的现象。对m统计分析表明,孪生激活与柱面滑移密切相关。
A statistical investigation of the operating slip/twinning modes and their interactions at grain scale over a large area,containing~400 grains,was carried out on rolled Mg sheets during room-temperature compression based on EBSD and slip trace analysis.For 10%strain,the slip mode was dominated by basal slip(89%).All the 363 identified twins were tension twins.The concave-up stress−strain curve indicated a twinning-dominated deformation behavior,which was further confirmed by the large twinned area fraction(41%)after the deformation.Most twin variants(79%)followed the Schmid law.The Luster−Morris parameter(m')did not correlate well to twin transmission.However,most twin transmissions(82%)exhibited larger normalized m(Schmid factor)and m'values.Additional slip systems were frequently active in the twin domains while not in the parent,which can be explained by Schmid law.Slip transfer across the twin boundaries was also observed.Statistical m analysis revealed that twinning activity was closely related to prismatic slip.
作者
尹冬弟
陈波
柴艳琴
万有富
周浩
郑江
王渠东
曾迎
Dong-di YIN;Bo CHEN;Yan-qin CHAI;You-fu WAN;Hao ZHOU;Jiang ZHENG;Qu-dong WANG;Ying ZENG(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;Nano and Heterogeneous Materials Center,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;International Joint Laboratory for Light Alloys(Ministry of Education),College of Materials Science and Engineering,Shenyang National Laboratory for Materials Science,Chongqing University,Chongqing 400044,China;National Engineering Research Center of Light Alloys Net Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
基金
supported by the National Natural Science Foundation of China(Nos.52171125,52071178)
the Open Testing Funding of Large Instruments and Equipment of Southwest Jiaotong University,China(No.2022SRII-003)
the Open Funding of International Joint Laboratory for Light Alloys(MOE),Chongqing University,China。
