Influence of Cr Contents on Microstructure of the Cast Al-3Si-0.4Mg Alloys

Dai Hang; Zhao Haidong; Li Changhai; Zhu Lin

doi:10.15980/j.tzzz.2019.12.026

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Influence of Cr Contents on Microstructure of the Cast Al-3Si-0.4Mg Alloys
Vol. 39, Issue 12, Pages: 1371-1375(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.12.026

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[1]代航,赵海东,李昌海,朱霖.Cr含量对铸造Al-3Si-0.4Mg合金微观组织的影响[J].特种铸造及有色合金,2019,39(12):1371-1375.

Dai Hang, Zhao Haidong, Li Changhai, et al. Influence of Cr Contents on Microstructure of the Cast Al-3Si-0.4Mg Alloys. [J]. Special Casting & Nonferrous Alloys 39(12):1371-1375(2019)
[1]代航,赵海东,李昌海,朱霖.Cr含量对铸造Al-3Si-0.4Mg合金微观组织的影响[J].特种铸造及有色合金,2019,39(12):1371-1375. DOI： 10.15980/j.tzzz.2019.12.026.

Dai Hang, Zhao Haidong, Li Changhai, et al. Influence of Cr Contents on Microstructure of the Cast Al-3Si-0.4Mg Alloys. [J]. Special Casting & Nonferrous Alloys 39(12):1371-1375(2019) DOI： 10.15980/j.tzzz.2019.12.026.

摘要

使用Thermo-Calc相图软件计算了不同Cr含量的铸造Al-3Si-0.4Mg合金的相图与凝固过程

并采用重力铸造进行验证。结果表明

试验结果和Thermo-Calc软件中Scheil模块所计算的结果一致

当Cr含量较低时（≤0.13%

质量分数）

Cr对合金的微观组织没有明显影响

当Cr含量较高时（≥0.2%）

形成了Al

（Cr

Fe）

相。当Cr含量从0.13%增加到0.2%时

合金中富Fe相的平均长度减小

富Fe相的体积分数增加。

Abstract

Phase diagrams and solidification processes of Al-3 Si-0.4 Mg alloys with different Cr contents were calculated by the Thermo-Calc phase diagram software

which were verified by gravity casting. The results reveal that the experimental results are in good agreement with those calculated by Scheil module in Thermo-Calc software. When the contents of Cr is less then 0.13%

the effect of Cr on the microstructure of the alloy can be ignored. When the contents of Cr is more than 0.2%

（Cr

Fe）

phase can be observed. As the Cr content increased from 0.13% to 0.2%

the average length of the iron-rich phase in the alloy is decreased

and the volume fraction of the iron-rich phase in the alloy is increased.