Effects of Mixed Addition of Alkaline Earth Element on Microstructure and Properties of AZ91D Magnesium Alloy

Xu Yunlong; Chen Gang; Zhao Yutao; Wan Peng; Yao Hongbo; Zhang Daoli

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Effects of Mixed Addition of Alkaline Earth Element on Microstructure and Properties of AZ91D Magnesium Alloy
Vol. 29, Issue 6, Pages: 564-566(2009)
Published： 2009 ，
DOI：

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[1]徐云龙,陈刚,赵玉涛,万鹏,姚宏博,张道理.碱土元素对AZ91D镁合金组织和性能的影响[J].特种铸造及有色合金,2009,29(06):564-566+488-489.

Xu Yunlong, Chen Gang, Zhao Yutao, et al. Effects of Mixed Addition of Alkaline Earth Element on Microstructure and Properties of AZ91D Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):564-566(2009)
[1]徐云龙,陈刚,赵玉涛,万鹏,姚宏博,张道理.碱土元素对AZ91D镁合金组织和性能的影响[J].特种铸造及有色合金,2009,29(06):564-566+488-489. DOI：

Xu Yunlong, Chen Gang, Zhao Yutao, et al. Effects of Mixed Addition of Alkaline Earth Element on Microstructure and Properties of AZ91D Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(6):564-566(2009) DOI：

摘要

通过向AZ91D合金中添加Ca、Ba、Sr3种碱土元素

熔炼制备了铸态镁合金

利用OM、SEM、EDS和XRD等手段研究了合金的铸态组织和物相组成

测试了其力学性能。结果表明

Ca、Ba、Sr的综合作用可以显著细化镁合金的铸态组织

并使网络状β-Mg17Al12相以球块状弥散分布

室温抗拉强度从AZ91D合金的156.3MPa提高到AZ91D-0.5Ca-0.2Ba-0.1Sr合金的187.6MPa。

Abstract

The as-cast magnesium alloy was prepared with alkaline earth element

such as Ca

Ba and Sr

by melting-casting.Microstructure

phase constituent and mechanical properties of the alloy were investigated by OM（optical microscope）

SEM（scanning electron microscope）

EDS（energy dispersive spectrometer）and XRD（X-ray diffraction）as well as tensile testing.The results show that the as-cast microstructure of the alloy can be significantly refined as a result of comprehensive effects of Ca

Ba and Sr element

in which net-like β-Mg17Al12 phase is converted into globular structure with dispersive distribution.In addition

the ambient tensile strength is increased form 156.3MPa of AZ91D alloy to 184.6MPa of AZ91D-0.5Ca-0.2Ba-0.1Sr alloy.