Microstructure and Properties as well as Fracture Behavior of As-extruded Mg-（6～9） Al-Zn Alloy

Du Yong1; Cao Hanxue1; Long Siyuan1; Cao Fenghong1; Zhu Qian1

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Microstructure and Properties as well as Fracture Behavior of As-extruded Mg-（6～9） Al-Zn Alloy
Vol. 29, Issue 9, Pages: 857-860(2009)
Published： 2009 ，
DOI：

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[1]杜勇,曹韩学,龙思远,曹凤红,朱茜.挤压态Mg-(6～9)Al-Zn的组织性能和断裂行为分析[J].特种铸造及有色合金,2009,29(09):857-860+782-783.

Du Yong1, Cao Hanxue1, Long Siyuan1, et al. Microstructure and Properties as well as Fracture Behavior of As-extruded Mg-（6～9） Al-Zn Alloy. [J]. Special Casting & Nonferrous Alloys 29(9):857-860(2009)
[1]杜勇,曹韩学,龙思远,曹凤红,朱茜.挤压态Mg-(6～9)Al-Zn的组织性能和断裂行为分析[J].特种铸造及有色合金,2009,29(09):857-860+782-783. DOI：

Du Yong1, Cao Hanxue1, Long Siyuan1, et al. Microstructure and Properties as well as Fracture Behavior of As-extruded Mg-（6～9） Al-Zn Alloy. [J]. Special Casting & Nonferrous Alloys 29(9):857-860(2009) DOI：

摘要

通过金相观察、拉伸试验和SEM分析等方法

研究了挤压态Mg-（6～9）Al-Zn合金的显微组织和力学性能。结果表明

挤压工艺使铸态下粗大枝状晶变成均匀细小等轴晶

随着Al含量增加

合金抗拉强度、硬度和晶粒大小均呈升高趋势

而伸长率先上升后下降。AZ91综合性能最优

抗拉强度、屈服强度和伸长率分别达336.7MPa、245.3MPa和17.1%。Mg-（6～9）Al-Zn合金均表现为准解理断裂特征

适当的Al含量有利于改善合金的综合性能

但Al含量过高所形成的脆性β（Mg17Al12）相加剧了镁合金的断裂倾向。

Abstract

Microstructure and mechanical properties of as-extruded Mg-（6

） Al-Zn alloys were investigated by OM （optical microscope）

tensile testing and SEM （scanning electron microscope）. The results indicate that coarse dendrite in as-cast alloy is transformed into fine equiaxed grain in as-extruded ones. With increasing in Al content

tensile strength

hardness and grain size are increased

however

elongation is firstly increased and then decreased. Tensile strength

yield strength and elongation of AZ91 magnesium alloy reach 336.7MPa

245.3MPa and 17.1%

respectively

showing the most desirable comprehensive properties. Fracture morphology of Mg-（6

）Al-Zn alloys is characterized by quasi-cleavage crack. Properties of the alloys can be improved with appropriate Al contents

however

crack tendency can be enhanced as a result of creation of Mg17Al12 phase with excessive Al addition.