Effects ofslip mode on microstructure evolution and compressive flow behavior of extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy  

滑移模式对挤压态低合金化Mg-0.5Bi-0.5Sn-0.5Mn合金显微组织演变和压缩流变行为的影响附视频

作　　者：Zhi-yong YOU Wei-li CHENG Guo-lei LIU Jian LI Li-fei WANG Hui YU Hong-xia WANG Ze-qin CUI Jin-hui WANG 游志勇;程伟丽;刘国磊;李戬;王利飞;余晖;王红霞;崔泽琴;王金辉(太原理工大学材料科学与工程学院,太原030024;青海大学部省合建盐湖化工大型系列研究设施,西宁810016;河北工业大学材料科学与工程学院,天津300132)

机构地区：[1]School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]Salt Lake Chemical Engineering Research Complex,Qinghai University,Xining 810016,China [3]School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300132,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第11期3599-3614,共16页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.51901153);Shanxi Scholarship Council of China (No.2019032);Natural Science Foundation of Shanxi Province,China (No.202103021224049);the Shanxi Zhejiang University New Materials and Chemical Research Institute Scientific Research Project,China (No.2022SX-TD025);the Open Project of Salt Lake Chemical Engineering Research Complex,Qinghai University,China (No.2023-DXSSKF-Z02)。

摘　　要：The influence of the slip mode on the microstructure evolution and compressive flow behavior at different strains in an extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy was analyzed through electron backscatter diffraction,X-ray diffraction,transmission electron microscopy,and hot compression tests.The results showed that at a low strain of 0.05,the basal,pyramidaland<c+a>slip modes were simultaneously activated.Nevertheless,at the middle stage of deformation(strain of 0.1,0.2 and 0.5),theslip mode was difficult to be activated and<c+a>slip mode became dominant.The deformation process between strains of 0.2 and 0.5 was primarily characterized by the softening effect resulting from the simultaneous occurrence of continuous dynamic recrystallization and discontinuous dynamic recrystallization.Ultimately,at strain of 0.8,a dynamic equilibrium was established,with the flow stress remaining constant due to the interplay between the dynamic softening brought about by discontinuous dynamic recrystallization and the work-hardening effect induced by the activation of the basalslip mode.通过电子背散射衍射、X射线衍射、透射电子显微分析和热压缩实验,深入分析滑移模式对挤压态低合金化Mg-0.5Bi-0.5Sn-0.5Mn合金显微组织演变和不同应变下压缩流变行为的影响。结果表明,在0.05的低应变下,基面、锥面和滑移模式同时被激活。然而,在变形中期阶段(应变0.1、0.2和0.5),滑移模式很难被激活,因此,滑移模式占主导地位。此外,与连续动态再结晶和非连续动态再结晶有关的软化效应主导应变为0.2~0.5的变形过程。最后,在0.8应变阶段,由于非连续动态再结晶引起的动态软化和基面滑移模式激活引起的加工硬化效应达到动态平衡,流变应力保持恒定。

关 键 词：dilute Mg−Bi−Sn−Mn alloy slip mode hot compression flow behavior dynamic recrystallization 

分 类 号：TG146.22[一般工业技术—材料科学与工程]