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

被引：201

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

页码：177 / 184

页数：8

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