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Role of yttrium content in twinning behavior of extruded mg−Y sheets under tension/compression

Transactions of Nonferrous Metals Society of China 2022年第11期32卷 3534-3549页

作者： Yan-qin CHAI Dong-di YIN Shen HUA Guang-hao HUANG Hao ZHOU Jiang ZHENG Qu-dong WANG Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Shenyang National Laboratory for Materials Science International Joint Laboratory for Light Alloys(Ministry of Education)College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering research Center of Light alloys Net Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The influence of Y content on the grain-scale twinning behavior in extruded mg−xY(x=0.5,1,5,wt.%)sheets under uniaxial tension and compression along the extruded direction was statistically *** automatic twin variant analysis was employed,based on large data sets obtained by electron backscatter diffraction(EBSD),including 2691 grains with 977 ***{1012}tension twinning(TTW)dominance and prevailing anomalous twinning behavior(Schmid factor(m)ression were *** anomalous twinning behavior was more pronounced as Y content increased under tensile loading,indicating a promoted stochasticity of twin variant selection for more concentrated mg−Y ***,the trend for the Y-content dependent anomalous twinning behavior was opposite in *** fractions of the anomalous TTWs were found to be well correlated with the maximum Schmid factor(m_(max))values of basal slip and prismatic slip in the corresponding parent grains for compression and tension,respectively,indicating that twinning and dislocation slip might be closely related in the present mg−Y alloys.

关键词： mg−re alloys deformation twinning twin variant selection Schmid factor anomalous twin

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