Microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy sheets processed by combined processes of extrusion, hot rolling and ageing
Microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy sheets processed by combined processes of extrusion, hot rolling and ageing
复制标题
挤压热轧时效复合Mg-Gd-Y-Zn-Zr合金板材的显微组织与力学性能
DOI：
10.1016/j.msea.2012.09.032
复制
发表时间：
2013-01-01
期刊：
影响因子：
6.4
通讯作者：
Lv, X. Y.
中科院分区：
文献类型：
--
作者：
Xu, C.;Zheng, M. Y.;Lv, X. Y.
研究了挤压-大应变热轧-时效复合工艺制备的Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr（wt%）合金板材的显微组织和力学性能。在300 ℃轧制的板材主要由变形晶粒组成，而在400 ℃轧制的板材完全再结晶，并且LPSO相分布在两种板材的晶界处。在300 ℃下轧制然后在200 ℃下峰值时效的片材在环境温度下分别表现出454 MPa的0.2%屈服应力（PS）、469 MPa的极限拉伸强度（UTS）和1.3%的断裂伸长率，以及在200 ℃下分别表现出413 MPa的0.2% PS、457 MPa的UTS和6.8%的断裂伸长率。而在400 ℃轧制并在200 ℃峰值时效的片材具有较低的0.2%PS和优异的上级延展性。强度的提高主要是由于晶粒内析出细小的β '相、晶界处的LPSO相和弥散分布的含Mg-Gd-Y立方相。(C)2012爱思唯尔有限公司版权所有。
The microstructure and mechanical properties of Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt%) alloy sheets produced by combined processes of extrusion, large-strain hot rolling and ageing treatment were investigated. The sheet rolled at 300 degrees C was mainly composed of deformed grains while that rolled at 400 degrees C was fully recrystallized, and the LPSO phase distributed at the grain boundaries in both sheets. The sheet rolled at 300 degrees C and then peak-aged at 200 degrees C exhibits 0.2% proof stress (PS) of 454 MPa, ultimate tensile strength (UTS) of 469 MPa and elongation to failure of 1.3% at ambient temperature, and 0.2% PS of 413 MPa, UTS of 457 MPa and elongation to failure of 6.8% at 200 degrees C, respectively. While the sheet rolled at 400 degrees C and peak aged at 200 degrees C had lower 0.2% PS and superior ductility. The improvement of strength is ascribed to the fine beta' phase precipitated within the grains, the LPSO phase and dispersed cuboid Mg-Gd-Y containing phase located at the grain boundaries. (C) 2012 Elsevier B.V. All rights reserved.