Improving microstructure and mechanical properties in Mg-6 mass% Zn alloys by combined addition of Ca and Ce

被引：51
作者：
Du, Yuzhou [1 ,2 ]
Zheng, Mingyi [2 ]
Qiao, Xiaoguang [2 ]
Wang, Debao [3 ]
Peng, Wenqiang [4 ]
Wu, Kun [2 ]
Jiang, Bailing [1 ]
机构：
[1] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[3] Maanshan Steel Co Ltd, Res & Technol Ctr, Maanshan 243000, Peoples R China
[4] China Acad Engn Phys, Inst Chem Mat, Mianyang 621999, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 656卷
基金：
中国国家自然科学基金;
关键词：
Microalloying; Texture; Microstructure; Mechanical properties; HIGH-STRENGTH; STRETCH FORMABILITY; CALCIUM ADDITIONS; ROOM-TEMPERATURE; TEXTURE; RECRYSTALLIZATION; BEHAVIOR; ENHANCEMENT; PLASTICITY; DUCTILITY;
D O I：
10.1016/j.msea.2016.01.034
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ca single or Ca-Ce double microalloying Mg-Zn alloy was cast and extruded in the present study. The combined addition of Ca and Ce improved the mechanical properties of Mg-6Zn alloy after extrusion obviously. Microstructure analysis reveals that Ca or Ca-Ce addition refined the dynamic recrystallized (DRXed) microstructure, promoted dynamic precipitation and modified the texture. The fine precipitates in the as-extruded Mg-Zn-Ca-Ce alloy pinned dislocation movement and inhibited dynamic re crystallization, resulting in a bimodal microstructure with fine-grained DRXed region and elongated deformed region. The recrystallization texture was weakened with Ca or Ca-Ce addition, which was mainly attributed to the particle stimulated nucleation (PSN) and shear bands nucleation (SBN). Compared with single Ca microalloying, Ca-Ce double microalloying was more effective to improve the mechanical properties of Mg-6Zn alloy. The as-extruded Mg-6Zn-0.7Ca-0.2Ce (mass%) alloy exhibited a good combination of strength and ductility with the yield strength of 287 MPa and elongation-to-fracture of 16.9%, which was related to the fine DRXed grains with weaker texture, high density precipitates, and the deformed region with strong basal texture. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：67 / 74
页数：8
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