Microstructures and mechanical properties of high-strength Mg-Gd-Y-Zn-Zr alloy sheets processed by severe hot rolling
Microstructures and mechanical properties of high-strength Mg-Gd-Y-Zn-Zr alloy sheets processed by severe hot rolling
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DOI：
10.1016/j.jallcom.2012.02.050
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发表时间：
2012-05-25
影响因子：
6.2
通讯作者：
Lv, X. Y.
中科院分区：
文献类型：
--
作者：
Xu, C.;Xu, S. W.;Lv, X. Y.
采用400℃热轧工艺制备了含长周期有序堆积相(LPSO)的Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr合金板材，总压下率达96%。研究了板材在热轧过程中的组织演变，并讨论了其对力学性能的影响。孪生主要发生在热轧初期，总变形量大于89%后孪晶消失。随着轧制量的增加，平均晶粒度逐渐细化，组织更加均匀，LPSO相的体积分数降低。此外，远离块状相和靠近块状相的LPSO相的类型也不同。在轧制过程中获得了基面织构，但强度随着轧制的深入而下降，这主要是由于动态再结晶和稀土元素的加入所致。压下率为96%的热轧板材具有优良的力学性能：屈服强度为318 Mpa，极限抗拉强度为403 Mpa，室温下沿轧制方向的断裂伸长率为13.7%。(C)2012爱思唯尔B.V.保留所有权利。
Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy sheets containing long period stacking ordered (LPSO) phase were prepared by hot rolling at 400 degrees C with total reduction of 96%. Microstructure evolution of the sheets during hot rolling was investigated, and its influence on mechanical properties was discussed. Twinning occurred during the early stage of hot rolling, and disappeared after total reduction higher than 89%. Average grain size was gradually refined, microstructure became much more homogeneous and volume fraction of LPSO phase decreased with increasing rolling reduction. Furthermore, the type of LPSO phases far from and near the block shaped phases were identified to be different. Basal texture was obtained during rolling process, but the intensity declined with the further rolling, which is mainly due to the dynamic recrystallization and the addition of RE elements. The as-rolled sheet with 96% reduction shows excellent mechanical properties: yield strength of 318 MPa, ultimate tensile strength of 403 MPa and elongation to failure of 13.7% at ambient temperature along the rolling direction. (C) 2012 Elsevier B.V. All rights reserved.