Microstructure of the TIG Welded Die Casting AM60B Magnesium Alloy

You Guoqiang1; Zhu Jüehua1; Guo Qiang1; Long Siyuan1

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Microstructure of the TIG Welded Die Casting AM60B Magnesium Alloy
Vol. 29, Issue 8, Pages: 729-732(2009)
Published： 2009 ，
DOI：

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[1]游国强,朱觉华,郭强,龙思远.压铸AM60B镁合金TIG焊组织研究[J].特种铸造及有色合金,2009,29(08):729-732+682.

You Guoqiang1, Zhu Jüehua1, Guo Qiang1, et al. Microstructure of the TIG Welded Die Casting AM60B Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(8):729-732(2009)
[1]游国强,朱觉华,郭强,龙思远.压铸AM60B镁合金TIG焊组织研究[J].特种铸造及有色合金,2009,29(08):729-732+682. DOI：

You Guoqiang1, Zhu Jüehua1, Guo Qiang1, et al. Microstructure of the TIG Welded Die Casting AM60B Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 29(8):729-732(2009) DOI：

摘要

对压铸AM60B镁合金板钨极氩弧焊缝显微组织进行了观察分析。结果表明

焊缝中心区由细小均匀的等轴晶和呈网状分布于晶界的高相比例Mg17Al12共晶相组成

在接近上自由表面分布着细小圆形气孔;靠焊缝侧的熔合区集中出现不同尺寸的气孔和微观疏松

显微组织由粗大等轴晶和数量明显减少、呈蠕虫状和颗粒状分布在晶界的Mg17Al12共晶相组成;靠热影响区侧的熔合区组织粗大、晶界和Mg17Al12共晶相逐渐模糊;热影响区组织形貌与母材相近

但晶粒有明显长大现象。

Abstract

The microstructure of joint in TIG welded die casting AM60B magnesium alloy plates was observed. The results indicate that the fusion zone （FZ） consists of uniform fine equiaxed grain and network high density eutectic Mg17Al12 phase distributed along grain boundary

and there exist small spherical gas holes distributed nearby surface. Gas hole with different sizes and shrinkage porosity can be observed in the partially melted zone （PMZ） nearby the FZ

and microstructure is composed of coarse equiaxed grain and decreasingly Mg17Al12 eutectic phase with worm or particle shape along grain boundary. The microstructure of PMZ nearby the heat-affected zone（HAZ） exhibits coarse structure and the disappearance of grain boundary with Mg17Al12 eutectic phase. In addition

microstructure of HAZ is similar to that of matrix materials

however

the coarseness of grain size can be presented.