Cu对稀土A356合金组织及力学性能的影响

朱志华; 马路路; 刘华; 黄美松; 邓月华; 谭青; 宋觉敏

doi:10.15980/j.tzzz.2017.06.028

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Cu对稀土A356合金组织及力学性能的影响
Effects of Cu on Microstructure and Mechanical Properties of Rare Earth Microalloying A356 Alloy
2017年37卷第6期页码：683-686
纸质出版日期： 2017 ，
DOI： 10.15980/j.tzzz.2017.06.028

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[1]朱志华,马路路,刘华,黄美松,邓月华,谭青,宋觉敏.Cu对稀土A356合金组织及力学性能的影响[J].特种铸造及有色合金,2017,37(06):683-686.

Zhu Zhihua, Ma Lulu, Liu Hua, et al. Effects of Cu on Microstructure and Mechanical Properties of Rare Earth Microalloying A356 Alloy[J]. Special Casting & Nonferrous Alloys, 2017,37(6):683-686.
[1]朱志华,马路路,刘华,黄美松,邓月华,谭青,宋觉敏.Cu对稀土A356合金组织及力学性能的影响[J].特种铸造及有色合金,2017,37(06):683-686. DOI： 10.15980/j.tzzz.2017.06.028.

Zhu Zhihua, Ma Lulu, Liu Hua, et al. Effects of Cu on Microstructure and Mechanical Properties of Rare Earth Microalloying A356 Alloy[J]. Special Casting & Nonferrous Alloys, 2017,37(6):683-686. DOI： 10.15980/j.tzzz.2017.06.028.

摘要

采用金相显微镜、扫描电镜、能谱仪、X射线衍射和万能电子拉伸试验机等手段

研究了稀土微合金化A356合金添加Cu后的显微组织和力学性能。结果表明

Cu对提高A356合金的强度具有显著的效果

不但细化了合金组织中的α-Al相

且使共晶Si由棒状转变为细小圆整的颗粒状

弥散分布在α-Al相晶界上。添加2.5%的Cu后A356合金力学性能最佳

抗拉强度、屈服强度及伸长率分别为322 MPa

235 MPa和4.6%

相比未添加Cu的A356合金分别提高了10.35%、26.82%和降低了21.5%。

Abstract

The effects of Cu on microstructure and mechanical properties of rare earth microalloying A356 alloy were investiagted by using Metalloscope

SEM

EDS

XRD and tensile testing machine. The results indicate that Cu has a significant effect on improving the strength of rare earth microalloying A356 alloy. Cu could not only refine primary α-Al phase but also take the transformation from rodlike structure to small round granular Si with diepersedly distributed on the grain boundary of α-Al phase. With 2. 5% Cu addition

the tensile strength

yield strength and elongation of the alloy reach 235 MPa

322 MPa and 4. 6%

respectively

which increased by 10.35%

26. 82% and decreased by 21. 5% compared with those of the alloy without Cu.