Effect of Solution Modes on Microstructure and Mechanical Properties of AZ91Magnesium Alloy after Aging Treatment

Wang Zhihu; Zhang Jumei; Chen Zishan

doi:10.15980/j.tzzz.2015.04.002

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Effect of Solution Modes on Microstructure and Mechanical Properties of AZ91Magnesium Alloy after Aging Treatment
Vol. 35, Issue 4, Pages: 341-344(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.04.002

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[1]王志虎,张菊梅,陈梓山.固溶处理对AZ91镁合金组织与性能的影响[J].特种铸造及有色合金,2015,35(04):341-344.

Wang Zhihu, Zhang Jumei, Chen Zishan. Effect of Solution Modes on Microstructure and Mechanical Properties of AZ91Magnesium Alloy after Aging Treatment. [J]. Special Casting & Nonferrous Alloys 35(4):341-344(2015)
[1]王志虎,张菊梅,陈梓山.固溶处理对AZ91镁合金组织与性能的影响[J].特种铸造及有色合金,2015,35(04):341-344. DOI： 10.15980/j.tzzz.2015.04.002.

Wang Zhihu, Zhang Jumei, Chen Zishan. Effect of Solution Modes on Microstructure and Mechanical Properties of AZ91Magnesium Alloy after Aging Treatment. [J]. Special Casting & Nonferrous Alloys 35(4):341-344(2015) DOI： 10.15980/j.tzzz.2015.04.002.

摘要

利用光学显微镜（OM）、扫描电镜（SEM）、X射线衍射仪（XRD）及金属硬度、拉伸试验

研究了AZ91铸造镁合金在固溶、复合固溶处理过程中原子扩散对后期时效组织与性能的影响。结果表明

复合固溶处理后Al原子在α-Mg中分布较固溶处理后更均匀

晶界处与晶粒心部的含量仅相差0.64%;同时

复合时效态合金具有良好的力学性能

与铸态合金相比

在塑性指标基本不下降的前提下

硬度提高了34%

抗拉强度提高了25%

屈服强度提高了55%。力学性能的变化与β-Mg17Al12相在时效过程中的析出方式及形态有关。

Abstract

Effects of solution and multiplicity solution treatment on microstructure and mechanical properties of AZ91 magnesium alloy after aging treatment were investigated by OM（optical microscopy）

SEM（scanning electron microscopy）

XRD（X-ray diffraction）as well as hardness and tensile tests.The results indicate that the distribution of Al atoms inα-Mg is more uniform after multiplicity treatment

and the concentration difference is only 0.64 % between the grain boundary and the grain center.At the same time

the mechanical properties of AZ91 magnesium alloy after multiplicity heat treatment exhibit more satisfactory.Compared with those of the as-cast alloy

the hardness

the tensile strength and yield strength are increased by 34%

25% and by 55%

respectively

meanwhile

the decrease of elongation can be ignored

which is related with the morphology ofβ-Mg17Al12 precipitation during the aging treatment.

关键词

AZ91镁合金β-Mg17Al12相固溶时效处理

Keywords

AZ91Magnesium Alloyβ-Mg17Al12PhaseSolid Solution and Aging Treatment

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Effect of Spheroidizing Time on Morphology of β-Mg₁₇Al₁₂ Phase and Mechanical Properties of AZ80 Magnesium Alloy