Influence of Varied Mg/Si Mass Ratio on the Microstructure and Mechanical Properties of Aluminum Die Casting Alloys

Liu Yong; Chen Chao; Zhang Zhenfu; Feng Hao; Chen Xiaolei; Xu Xianghe; Li Dejiang; Zeng Xiaoqin

doi:10.15980/j.tzzz.2017.11.005

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Influence of Varied Mg/Si Mass Ratio on the Microstructure and Mechanical Properties of Aluminum Die Casting Alloys
Vol. 37, Issue 11, Pages: 1179-1182(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.11.005

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[1]刘勇,陈超,张振富,冯浩,陈晓磊,徐祥合,李德江,曾小勤.不同Mg、Si质量比对压铸铝合金组织与性能的影响[J].特种铸造及有色合金,2017,37(11):1179-1182.

Liu Yong, Chen Chao, Zhang Zhenfu, et al. Influence of Varied Mg/Si Mass Ratio on the Microstructure and Mechanical Properties of Aluminum Die Casting Alloys. [J]. Special Casting & Nonferrous Alloys 37(11):1179-1182(2017)
[1]刘勇,陈超,张振富,冯浩,陈晓磊,徐祥合,李德江,曾小勤.不同Mg、Si质量比对压铸铝合金组织与性能的影响[J].特种铸造及有色合金,2017,37(11):1179-1182. DOI： 10.15980/j.tzzz.2017.11.005.

Liu Yong, Chen Chao, Zhang Zhenfu, et al. Influence of Varied Mg/Si Mass Ratio on the Microstructure and Mechanical Properties of Aluminum Die Casting Alloys. [J]. Special Casting & Nonferrous Alloys 37(11):1179-1182(2017) DOI： 10.15980/j.tzzz.2017.11.005.

摘要

研究了Mg、Si质量比对Al-4Mg-xSi-0.6Cr合金组织和性能的影响。结果表明

未加入Si时

Mg主要固溶于α-Al基体中

少量形成颗粒状的Al

相

综合力学性能好。随着Si的加入

Mg主要与Si形成Al-Mg

Si共晶组织

合金强度显著提高

但是塑性急剧下降。Mg、Si元素质量比减小导致Al-Mg

Si共晶组织层片间距增大

形貌变为带有尖端的凹多边形

容易在拉伸过程中形成应力集中

加速合金断裂。当Mg、Si质量比减小到1.6时

继续提高Si含量

Si相的数量不再增加

但是有长条状共晶Si生成

强化合金的同时使合金的塑性进一步降低。含Cr相的种类和形貌与Mg、Si元素质量比有关

过剩Mg时Cr元素以大块状Al13Cr2相存在

过剩Si时Cr元素以不规则状Al5（Cr

Fe）Si相均匀分布。

Abstract

The influence of w（Mg）/w（Si）mass ratio on the microstructure and mechanical properties of Al-4 Mg-xSi-0.6 Cr die casting alloys was investigated.The results reveal that Mg is mainly soluted inα-Al matrix and a small amount of Al

particle phase can be generated

which results in the high comprehensive mechanical properties withoutSi added in the alloy.With the addition ofSi elements

the strength of the alloy is increased

while ductility is decreased sharply due to Mg andSi formed Al-Mg

Si eutectic microstructure.Al-Mg

Si eutectic lamellar spacing is increased and it’s morphology is transferred into concave polygon with the decrease of Mg/Si mass ratio

which can accelerate fracture during tensile process as a result of stress concentration.When the Mg/Si mass ratio is decrease to 1.6

with the increase ofSi

the amount of Mg

Si phase keeps constant value.Meanwhile

the strength is increased and ductility is decreased due to long stripSi eutectic phase formed in the die casting alloy.The category and morphology of Cr phase are related with Mg/Si mass ratio.With excess of Mg

the Cr exists in form of large block Al13 Cr2 phase

while with excessSi

the Cr is distributed evenly with irregular Al5（Cr

Fe）Si.