Effects of RE on Microstructure and Mechanical Properties of Squeeze Cast AlSi7Cu4MgMn Alloy

Zhang Yaqin; Fan Xiaoze; Chan Norman; Lee Yuen Fat; Xu Tao; Yin Wei; Song Zhuoneng; Li Fabing

doi:10.15980/j.tzzz.2019.10.015

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Effects of RE on Microstructure and Mechanical Properties of Squeeze Cast AlSi7Cu4MgMn Alloy
Vol. 39, Issue 10, Pages: 1097-1100(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.10.015

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[1]张亚琴,樊晓泽,陈善荣,李远发,徐涛,尹伟,宋卓能,李法兵.RE对挤压铸造AlSi7Cu4MgMn合金组织和性能的影响[J].特种铸造及有色合金,2019,39(10):1097-1100.

Zhang Yaqin, Fan Xiaoze, Chan Norman, et al. Effects of RE on Microstructure and Mechanical Properties of Squeeze Cast AlSi7Cu4MgMn Alloy. [J]. Special Casting & Nonferrous Alloys 39(10):1097-1100(2019)
[1]张亚琴,樊晓泽,陈善荣,李远发,徐涛,尹伟,宋卓能,李法兵.RE对挤压铸造AlSi7Cu4MgMn合金组织和性能的影响[J].特种铸造及有色合金,2019,39(10):1097-1100. DOI： 10.15980/j.tzzz.2019.10.015.

Zhang Yaqin, Fan Xiaoze, Chan Norman, et al. Effects of RE on Microstructure and Mechanical Properties of Squeeze Cast AlSi7Cu4MgMn Alloy. [J]. Special Casting & Nonferrous Alloys 39(10):1097-1100(2019) DOI： 10.15980/j.tzzz.2019.10.015.

摘要

研究了不同RE（Ce、La混合稀土）含量对挤压铸造AlSi7Cu4MgMn合金组织、力学性能及铸造性能的影响。结果表明

RE可提升合金铸造性能

大幅度提高合金成形的良品率。不含RE时

AlSi7Cu4MgMn合金微观组织由α-Al基体、共晶Si相、块状α-Fe相、小块聚集状Al

Cu相及其他强化相组成;添加适量RE后

块状Fe相转变为短棒状形态

Cu相细化并形成Al

复杂相;过量RE添加会导致合金中富Fe相聚集长大

恶化合金性能。添加0.25%的RE时合金力学性能最佳

抗拉强度为430MPa

屈服强度为392MPa

伸长率为6.8%。

Abstract

The effects of RE on microstructure

mechanical properties as well as the casting properties of AlSi7Cu4MgMn prepared by squeezing forging process were investigated.The results show that the RE can improve the casting properties and qualified rate of AlSi7Cu4MgMn alloy.The microstructure of AlSi7Cu4MgMn alloy is composed ofα-Al

eutectic Si phase

Cu and other strengthening phases.The shape of Fe phase is changed from bulky structure into short stick with the RE addition.Meanwhile

the Al

Cu phase is refined and changed into Al

complex phase.The mechanical properties of the alloy is weakened with excessive RE addition as a result of inducing Fe phase growth in the alloy.The RE can improve the mechanical properties of the alloy.The ultimate tensile strength

yield strength and elongation of AlSi7Cu4MgMn alloy reach 430 MPa

392 MPa and 6.8%

respectively

with 0.25% RE addition.