Effects of Gd on Microstructure and Compressive Creep Behavior of Mg-7Al-1Si Magnesium Alloy

Wang Wuxiao; Zhang Sha; Liu Jian; Sheng Qing; Zhang Dongjie

doi:10.15980/j.tzzz.2014.04.009

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Effects of Gd on Microstructure and Compressive Creep Behavior of Mg-7Al-1Si Magnesium Alloy
Vol. 34, Issue 4, Pages: 346-349(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.04.009

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[1]王武孝,张莎,刘健,申情,张东杰.Gd含量对Mg-7Al-1Si合金组织及蠕变性能的影响[J].特种铸造及有色合金,2014,34(04):346-349.

Wang Wuxiao, Zhang Sha, Liu Jian, et al. Effects of Gd on Microstructure and Compressive Creep Behavior of Mg-7Al-1Si Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 34(4):346-349(2014)
[1]王武孝,张莎,刘健,申情,张东杰.Gd含量对Mg-7Al-1Si合金组织及蠕变性能的影响[J].特种铸造及有色合金,2014,34(04):346-349. DOI： 10.15980/j.tzzz.2014.04.009.

Wang Wuxiao, Zhang Sha, Liu Jian, et al. Effects of Gd on Microstructure and Compressive Creep Behavior of Mg-7Al-1Si Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 34(4):346-349(2014) DOI： 10.15980/j.tzzz.2014.04.009.

摘要

利用光学显微镜、扫描电镜、X射线衍射分析及高温压缩蠕变装置等

研究了稀土元素Gd对Mg-7Al-1Si合金显微组织及蠕变性能的影响。结果表明

适量Gd的加入能明显细化Mg-7Al-1Si合金的晶粒尺寸、改善Mg2Si相的形态

使β相分布更弥散

并提高了合金的抗高温蠕变性能

Gd的加入还使基体中出现新相Al2Gd。Gd含量为1.0%时

合金的组织和成分均匀

细化效果最好

抗高温蠕变性能也最佳。此时晶粒平均尺寸由79.08μm减小到39.12μm

β相含量由10.88%减少到6.98%

同时Mg2Si相形态明显改善

由粗大汉字状变为短杆状及颗粒状

从而提高了合金的抗高温蠕变性能。

Abstract

Effects of Gd on microstructure and compressive creep behavior of Mg-7Al-1Si alloy were investigated by optical microscopy（OM）

scanning electron microscope（SEM）

X-ray diffraction analysis（XRD）and high temperature compressive creep apparatus.The results show that proper Gd addition can greatly refine the as-cast microstructure and improve the morphology of Mg2Si phase as well as making theβphase more dispersed distribution

so the elevated creep behavior of the alloy is improved.In addition

Al2Gd particulate appears in the matrix.The microstructure and composition of Mg-7Al-1Si alloys are more homogeneous with 1.0%Gd and desirable grain refinement and high creep resistance can be obtained

where the average grain size is decreased from 79.08μm to 39.12μm

and theβphase content are decreased from 10.88%to 6.98%

while the morphology of the Mg2Si phases is changes from coarse Chinese script shape to short rod or fine particle.Accordingly

the creep properties of the alloy are improved greatly.