Effects of RE Element Y on the Microstructure of ZM5 Mg Alloy

Liu Gangqiang~1 Chen Leping~2 Ai Yunlong~2

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Effects of RE Element Y on the Microstructure of ZM5 Mg Alloy
Issue 8, Pages: 496-498(2005)
Published： 2005 ，
DOI：

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[1]刘刚强,陈乐平,艾云龙.稀土Nd对ZM5合金组织与性能影响的研究[J].特种铸造及有色合金,2005(08):496-498+447.

Liu Gangqiang~1 Chen Leping~2 Ai Yunlong~2. Effects of RE Element Y on the Microstructure of ZM5 Mg Alloy. [J]. Special Casting & Nonferrous Alloys (8):496-498(2005)
[1]刘刚强,陈乐平,艾云龙.稀土Nd对ZM5合金组织与性能影响的研究[J].特种铸造及有色合金,2005(08):496-498+447. DOI：

Liu Gangqiang~1 Chen Leping~2 Ai Yunlong~2. Effects of RE Element Y on the Microstructure of ZM5 Mg Alloy. [J]. Special Casting & Nonferrous Alloys (8):496-498(2005) DOI：

摘要

在ZM5合金熔体中加入不同量的稀土Nd

经过不同处理

利用光学显微镜、扫描电镜以及能谱分析

研究了稀土Nd对ZM5合金组织的影响规律。试验结果表明

向ZM5合金中添加稀土Nd的质量分数达2%时

合金的显微组织明显改善。X衍射和金相照片显示ZM5合金铸态组织为α-Mg固溶体和沿晶界分布的网状β-Mg17Al12组成

固溶处理后Mg17Al12弥散在基体中

而加入稀土元素Nd的ZM5合金由α（基体）

Mg17Al12

颗粒状Mg12Nd等相组成。经固溶处理后网状Mg17Al12相完全溶解

留下热稳定较高的析出相Mg12Nd等。扫描电镜显示ZM5合金拉伸试样断口是解理断裂的断口形态

而加入稀土Nd的ZM5合金拉伸试样断口是沿晶断裂+准解理断裂的混合断口形态。其原因是加入稀土Nd后

熔体中生成了与镁基体共格的强化相Mg12Nd改变了其断口形貌。

Abstract

The effects of different Y contents on microstructure of ZM5 Mg alloy were investigated by optical microscope and SEM and EPA.It was found that 2[WTXT]%[WT]

Y addition can obviously improve the microstructure of the ZM5 Mg alloy.X ray diffusion and OM observation indicated as-cast microstructure of the alloy consitsts of α-Mg phase and net-like β-Mg

phase in boundary

in which solid solution treated β-Mg

phase was dispersed in the matrix

in turn

microstructure of ZM5 alloy containing Re element Y consists of α phase

β-Mg

phase and particle MgY phase.Solid solution treated alloy consists of MgY phase and precipitated Al

Y phase.SEM showed that ZM5 Mg alloy possesses the features of cleavage fracture while ZM5 Mg alloy containing Y has mixed fracture morphology of quasi-cleavage fracture and boundary fracture.The reason is that enhancing phase MgY and dispersely precipitated phase transform the fracture morphology.