Effect of final rolling reduction on the microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy sheets
Effect of final rolling reduction on the microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy sheets
复制标题
最终轧制压下量对Mg-Gd-Y-Zn-Zr合金板显微组织和力学性能的影响
DOI：
10.1016/j.msea.2012.08.089
复制
发表时间：
2013-01-01
期刊：
影响因子：
6.4
通讯作者：
Liu, Y. T.
中科院分区：
文献类型：
--
作者：
Xu, C.;Zheng, M. Y.;Liu, Y. T.
对不同终轧变形量的Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr(wt.%)合金在400℃下进行了热轧，分析了板材的组织演变和织构，讨论了它们对力学性能的影响。所有轧制板材均由几乎无规则取向的细小动态再结晶组织、较大的变形组织和强烈的基面织构组成。此外，在变形后的晶粒中还观察到由于扭结变形而形成的弯曲片状长周期堆积有序相(LPSO)。随着终轧变形量的增加，动态再结晶体积分数增加，基础织构逐渐减弱。随着终轧压下量的增加，合金板材的强度变化不大，而屈服各向异性和塑性显著改善。减薄60%的终轧薄板在常温下的拉伸屈服强度为306兆帕，极限拉伸强度为393兆帕，断裂伸长率为14.6%，在250℃时的拉伸屈服强度为264兆帕，极限拉伸强度为345兆帕，断裂伸长率为19.4%。(C)2012 Elsevier B.V.
The Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy was hot rolled with different final rolling reductions at 400 degrees C. The microstructure evolution and texture of the sheets were analyzed, and their effect on the mechanical properties was discussed. All of the rolled sheets consist of fine dynamically recrystallized grains with almost random orientation, large deformed grains with strong basal texture. In addition, bent lamellar-shaped long period stacking ordered (LPSO) phases due to kink deformation were observed in the deformed grains. The volume fraction of the dynamic recrystallization increased with increasing final rolling reduction and the basal texture weakened gradually. The strength of the alloy sheets changed a little with increasing final rolling reduction, while the yield anisotropy and the ductility were significantly improved. The sheet final-rolled with thickness reduction of 60% exhibits tensile yield strength of 306 MPa, ultimate tensile strength of 393 MPa and elongation to failure of 14.6% at ambient temperature, and tensile yield strength of 264 MPa, ultimate tensile strength of 345 MPa and elongation to failure of 19.4% at 250 degrees C. (C) 2012 Elsevier B.V. All rights reserved.