挤压铸造AZ91D镁合金的显微组织与力学性能

陈云; 熊新红; 杜艳迎; 罗继相; 陶振锋

doi:10.15980/j.tzzz.2015.04.013

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挤压铸造AZ91D镁合金的显微组织与力学性能
Microstructure and Mechanical Properties of Squeeze Casting AZ91D Magnesium Alloy
2015年35卷第4期页码：380-383
纸质出版日期： 2015 ，
DOI： 10.15980/j.tzzz.2015.04.013

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[1]陈云,熊新红,杜艳迎,罗继相,陶振锋.挤压铸造AZ91D镁合金的显微组织与力学性能[J].特种铸造及有色合金,2015,35(04):380-383.

Chen Yun, Xiong Xinhong, Du Yanying, et al. Microstructure and Mechanical Properties of Squeeze Casting AZ91D Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2015,35(4):380-383.
[1]陈云,熊新红,杜艳迎,罗继相,陶振锋.挤压铸造AZ91D镁合金的显微组织与力学性能[J].特种铸造及有色合金,2015,35(04):380-383. DOI： 10.15980/j.tzzz.2015.04.013.

Chen Yun, Xiong Xinhong, Du Yanying, et al. Microstructure and Mechanical Properties of Squeeze Casting AZ91D Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2015,35(4):380-383. DOI： 10.15980/j.tzzz.2015.04.013.

摘要

研究了挤压铸造AZ91D镁合金在不同热处理状态下的显微组织、力学性能以及厚度对镁合金试样力学性能的影响。结果表明

挤压铸造AZ91D镁合金铸态显微组织主要由基体α-Mg和在晶内及晶界上分布的β-Mg17Al12相组成

经固溶处理后得到单相α-Mg固溶体组织

而且在α-Mg晶粒内部也出现了少量颗粒状析出物

经固溶时效处理后β-Mg17Al12相再一次在α-Mg晶内和晶界析出

且晶粒变得更加细小;挤压铸造AZ91D镁合金的硬度、屈服强度、抗拉强度随着试样厚度的增加而减小

而伸长率随着试样厚度的增加而增加。

Abstract

Microstructure and mechanical properties of squeeze casting AZ91 Dalloy under different heat treatment conditions were investigated

and effects of wall thickness on mechanical properties were also discussed.The results show that microstructure of squeeze casting AZ91 Dalloy consists of primaryα-Mg matrix andβ-Mg17Al12 phase which is mainly present in the matrix and grain boundaries.Single phaseα-Mg solid solution is observed after solid solution treatment

and a few granular precipitates are distributed insideα-Mg matrix.After solid solution aging treatment

β-Mg17Al12 phase is distributed at insideα-Mg matrix and grain boundaries again.Moreover

theβ-Mg17Al12 phase is present in form of finer particles.The hardness

yield strength and tensile strength of squeeze casting AZ91 Dalloy are decreased while elongation is increased with the increase of wall thickness.