Effects of Y,Gd and Ca on Microstructure and Mechanical Properties of AZ81 Magnesium Alloy

Chen Jun; Li Quan’an; Li Xiaofeng; Xie Jianchang; Zhang Xingyuan

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Effects of Y,Gd and Ca on Microstructure and Mechanical Properties of AZ81 Magnesium Alloy
Vol. 28, Issue 12, Pages: 980-982(2008)
Published： 2008 ，
DOI：

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[1]陈君,李全安,李肖丰,谢建昌,张兴渊.Y、Gd与Ca对AZ81镁合金组织和力学性能的影响[J].特种铸造及有色合金,2008,28(12):980-982+902.

Chen Jun, Li Quan’an, Li Xiaofeng, et al. Effects of Y,Gd and Ca on Microstructure and Mechanical Properties of AZ81 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 28(12):980-982(2008)
[1]陈君,李全安,李肖丰,谢建昌,张兴渊.Y、Gd与Ca对AZ81镁合金组织和力学性能的影响[J].特种铸造及有色合金,2008,28(12):980-982+902. DOI：

Chen Jun, Li Quan’an, Li Xiaofeng, et al. Effects of Y,Gd and Ca on Microstructure and Mechanical Properties of AZ81 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 28(12):980-982(2008) DOI：

摘要

通过合金制备、微观分析和力学性能测试等方法研究了Y、Gd与Ca对AZ81镁合金组织和力学性能的影响。结果表明

适量合金元素的加入使AZ81镁合金的组织明显细化

β（Mg17Al12）相减少

同时析出了针状和粒状的化合物Al2Y和Al2Ca。经时效处理后

随着合金元素含量的增加

从室温到175℃时

合金的强度和伸长率基本上呈先升后降的趋势。当Y、Gd与Ca总含量为2.1%时

合金在室温和175℃下的抗拉强度达到最大

分别为230MPa和160MPa。Y、Gd与Ca主要是通过细晶强化、固溶强化和弥散强化提高了镁合金的室温和高温强度。

Abstract

Effects of Y

Gd and Ca on the microstructure and mechanical properties of AZ81 magnesium alloy were investigated by microstructural observation and testing.The results indicate that additions of Y

Gd and Ca element can distinctly refine the grain size in microstructure of AZ81 magnesium alloy

resulting in the reduction of β（Mg17Al12） phase and the precipitation of acicular and granular Al2Y phase Al2Ca phase.With increasing in addition of the elements

tensile strength and elongation of the aged magnesium alloy are firstly increased and then decreased at 20

75 ℃.The desirable tensile strengths of the alloy at room temperature and at 175 ℃ reach 230 MPa and 160 MPa

respectively

with the total Y

Gd and Ca addition of 2.1%

which is attributed to grain refining strengthening

solution strengthening and dispersion strengthening by Y

Gd and Ca.