Achieving exceptionally high strength in binary Mg-13Gd alloy by strong texture and substantial precipitates

被引：114
|
作者：
Li, R. G. [1 ]
Li, H. R. [1 ]
Pan, H. C. [2 ]
Xie, D. S. [2 ]
Zhang, J. H. [3 ]
Fang, D. Q. [4 ]
Dai, Y. Q. [1 ]
Zhao, D. Y. [1 ]
Zhang, H. [1 ]
机构：
[1] Shenyang Univ Chem Technol, Sch Mech & Power Engn, Shenyang 110142, Peoples R China
[2] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China
[3] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China
[4] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
来源：
SCRIPTA MATERIALIA | 2021年 / 193卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloy; Extrusion; Aging; Texture; Precipitate; FREE ZONES PFZS; MG-GD; MECHANICAL-PROPERTIES; MICROSTRUCTURE EVOLUTION; DUCTILITY; AG; FABRICATION; EXTRUSION; BEHAVIOR;
D O I：
10.1016/j.scriptamat.2020.10.052
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ultra-high strength is obtained in the simple binary Mg-Gd alloy with only a small extrusion ratio, and its main strengthening contribution is different from that reported in previous works. The tensile yield strength (TYS) of Mg-13Gd alloy can reach 350 MPa by hot extrusion with an extrusion ratio of 4. The strong texture and internal dislocation pinning of the un-dynamically recrystallized (un-DRXed) region with large proportion contribute greatly to the strength of as-extruded alloy. It is found for the first time that aging precipitation only occurs within the large un-DRXed grains but not in the fine DRXed grains. The TYS of extruded + peak-aged alloy increases to 470 MPa. The ultra-high strength is mainly related to texture strengthening and precipitation strengthening, rather than fine grain strengthening and precipitation strengthening in the conventional Mg alloys with large plastic deformation. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：142 / 146
页数：5
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