Texture evolution, deformation mechanism and mechanical properties of the hot rolled Mg-Gd-Y-Zn-Zr alloy containing LPSO phase
发布时间：2021-10-21
点击次数：
DOI码：10.1016/j.msea.2018.06.062
发表刊物：Materials Science and Engineering A
关键字：Magnesium alloys; LPSO phase; Texture evolution; Deformation mechanism; Mechanical properties
摘要：The texture evolution, crystal orientation-dependent deformation mechanism and mechanical properties of the Mg-5.5Gd-4.4Y-1.1Zn-0.5Zr (wt%) alloy sheet with bimodal grain structure during hot rolling were investigated in this study. The pre-rolled sheet possesses the texture with c-axis randomly distributed in rolling-transverse plane. During the hot rolling deformation, the initial texture is gradually changed to an uncommon texture with c-axis continuously distributed between transverse direction (TD) and normal direction (ND) of the rolled sheet. The formation of the texture is related to the orientation-dependent deformation mechanism of coarse grains. For the coarse grains with c-axis close to rolling direction (RD), {10-12} twinning was identified to be the dominated deformation mechanism. With the activation of twinning, the c-axis of the matrix is reoriented towards ND. For the coarse grains with c-axis near TD, prism <a> slip and kink deformation were figured out as the dominated deformation modes. In early stage of the hot rolling deformation, the c-axis of the grains remains in TD with the activation of prism <a> slip. Afterwards, kink deformation activates and the c-axis of the grains is rotated away from TD towards ND with different degrees. In addition, the mechanical properties of rolled sheets were examined and the results demonstrate that yield strength and tensile strength are gradually improved by rolling deformation. Nevertheless, the improvement of yield strength in RD is much greater than that in TD and a serious yield strength anisotropy is shown in the rolled sheet. The strong yield strength anisotropy derives from the variation of texture strengthening in the RD and TD due to the formation the texture with c-axis continuously distributed between TD and ND.
合写作者：Z.Y. Chen*, T. Chen, R.K. Wang, Y.L. Liu, C.M. Liu
第一作者：J.B. Shao
论文类型：期刊论文
学科门类：工学
一级学科：材料科学与工程
文献类型：J
卷号：731
页面范围：479-486
ISSN号：0921-5093
是否译文：否
发表时间：2018-06-20
收录刊物：SCI