Effects of Ca and Si Compound Alloying on Microstructure of AZ31 Magnesium Alloy

Li Jiqiang1; Zhang Lei2; Liu Wen1; Zhang Zhao1

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Effects of Ca and Si Compound Alloying on Microstructure of AZ31 Magnesium Alloy
Vol. 30, Issue 8, Pages: 699-701(2010)
Published： 2010 ，
DOI：

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[1]李继强,张磊,刘文,张钊.Ca、Si复合合金化对AZ31镁合金显微组织的影响[J].特种铸造及有色合金,2010,30(08):699-701+680.

Li Jiqiang1, Zhang Lei2, Liu Wen1, et al. Effects of Ca and Si Compound Alloying on Microstructure of AZ31 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 30(8):699-701(2010)
[1]李继强,张磊,刘文,张钊.Ca、Si复合合金化对AZ31镁合金显微组织的影响[J].特种铸造及有色合金,2010,30(08):699-701+680. DOI：

Li Jiqiang1, Zhang Lei2, Liu Wen1, et al. Effects of Ca and Si Compound Alloying on Microstructure of AZ31 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 30(8):699-701(2010) DOI：

摘要

采用金相显微镜、扫描电镜、X射线能谱仪和X射线衍射仪研究了Ca、Si元素对AZ31镁合金铸态组织的影响。结果表明

在AZ31镁合金中同时加入Ca、Si元素后

Ca主要以固溶形式存在于AZ31镁合金中

Si的加入对Ca的分布没有产生影响

Si主要和Mg生成Mg2Si化合物

同时沿晶界分布的β-Mg17Al12相逐渐演变为在晶界附近和晶内弥散分布的细小点状（球状）和针状相。随着Si含量的增加

部分点状相开始粗化

并在基体中出现了汉字状的Mg2Si相。当加入0.3%的Ca与0.4%的Si时

合金铸态组织最为细化。

Abstract

Effects of Ca and Si compound alloying on as-cast microstructure of AZ31 magnesium alloy were analyzed by optical microscope （OM）

SEM （scanning electron microscope）

XRD （X-ray diffraction） and EDS （energy dispersive spectrometer）. It is found that Ca element exists in the AZ31 magnesium in form of solid solution phase

and Si element is irrelative with the distribution of Ca in the alloy. Mg2Si phase is created by Si reacting with Mg

meanwhile

Mg17Al12 phase distributed along boundary is gradually converted into particle and acicular phase dispersedly distributes around boundary or in the grain. With increasing in Si addition

partial particles become coarse

and Chinese script Mg2Si phase appears in the matrix alloy. The desirable as-cast microstructure of the alloy can be observed with 0.3% Ca and 0.4% Si compound addition.