Age-hardening response of Mg-0.3 at.%Ca alloys with different Zn contents

被引：200
作者：
Oh-ishi, K. [1 ]
Watanabe, R. [2 ]
Mendis, C. L. [1 ]
Hono, K. [1 ,2 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 526卷 / 1-2期
关键词：
Magnesium alloy; Age-hardening; Precipitation; GP zone; TEM; HAADF; MG-ZN; PRECIPITATION; CREEP; RESISTANCE; CRYSTALS;
D O I：
10.1016/j.msea.2009.07.027
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We have investigated the age-hardening responses and corresponding microstructures of Mg-0.3Ca-xZn (x = 0.0, 0.1, 0.3, 0.6, 1.0, 1.6 at.%) alloys by hardness test, transmission electron microscopy (TEM), and high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). Zn additions up to x = 0.6 lead to enhanced age-hardening responses with the highest peak hardness of HV = 69 for x = 0.6. Further addition of Zn degraded the age-hardening responses. HAADF-STEM images revealed that the finely dispersed monolayer G.P. zones with internal ordered structure are the major contributor to the age-hardening. Excess addition of Zn resulted in the formation of Ca2Mg6Zn3 precipitates suppressing the formation of the ordered G.P. zones. (C) 2009 Elsevier B.V. All rights reserved.
引用
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页码：177 / 184
页数：8
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