Enhanced strength and plasticity of Mg-6Zn-0.5Zr alloy by low-temperature indirect extrusion

被引：21
|
作者：
Kim, Beomcheol [1 ]
Baek, Soo-Min [1 ]
Lee, Jung Gu [2 ]
Park, Sung Soo [1 ]
机构：
[1] Ulsan Natl Inst Sci & Technol, Sch Mat Sci & Engn, Ulsan 44919, South Korea
[2] Univ Ulsan, Sch Mat Sci & Engn, Ulsan 44610, South Korea
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 706卷
基金：
新加坡国家研究基金会;
关键词：
Magnesium alloys; Extrusion; Grain refinement; Strength; Superplasticity; ZN-ZR ALLOY; GRAIN-REFINEMENT; MAGNESIUM ALLOY; STRUCTURAL SUPERPLASTICITY; DYNAMIC RECRYSTALLIZATION; MECHANICAL-PROPERTIES; ZK60; ALLOY; MG ALLOYS; BEHAVIOR; DEFORMATION;
D O I：
10.1016/j.jallcom.2017.02.206
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructure and tensile properties of Mg-6Zn-0.5Zr alloy processed by low-temperature indirect extrusion utilizing artificial cooling were investigated. Remarkable grain refinement was obtained by the application of artificial cooling, resulting in an increase in the yield strength of as much as 53 MPa at room temperature, as compared to the case (245 MPa) of indirect extrusion without artificial cooling. Besides this, the fine-grained alloy was found to have superplastic properties at elevated temperature, revealing tensile elongations of 720-810% at 200 degrees C at strain rates of 2 x 10(-4)-1 x 10(-3) s(-1). Mechanisms responsible for the high strength and superplastic properties are discussed. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：56 / 62
页数：7
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