Effect of twinning on the yield surface shape of Mg alloy plates under in-plane biaxial loading

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:216

Article

Qiao, H.¹  Xin, Y. C.²  Zong, Z. L.¹  Wu, P. D.³ 

[1] Jiangsu Ocean Univ, Sch Civil & Ocean Engn, Lianyungang 222005, Peoples R China

[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400030, Peoples R China

[3] McMaster Univ, Dept Mech Engn, Hamilton, ON L8S 4L7, Canada

关键词: Twinning;    Plastic anisotropy;    Yield surface;    Magnesium alloy;   

DOI  :  10.1016/j.ijsolstr.2021.01.029

来源: Elsevier

【 摘 要 】

The EVPSC-TDT model is first employed to investigate the yield behavior of a strongly basal textured Mg alloy plate under biaxial loading. The material parameters are calibrated according to experimental uniaxial tension and compression along the rolling and plate normal directions. The EVPSC-TDT model with the calibrated parameters is then employed to conduct various biaxial loadings under plane stress condition. The predicted yield surface and its evolution match well with the experimental data. The shape change of the yield surfaces in all four quadrants is interpreted according to the activated deformation modes. Compressive twinning weakens the work hardening behavior in the first quadrant of the yield surface at relatively large plastic strain level, while tensile twinning plays an important role in determining the shape of the second, third and fourth quadrants of the yield surface. A turning point corresponding to pure shear loading is observed in the second quadrant of the yield surface which is caused by the transition of activated deformation modes from basal slip and tensile twinning to non-basal slip. In addition, the effect of initial texture on the shape of the yield surface of Mg alloy plates has been briefly investigated. (C) 2021 Published by Elsevier Ltd.

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