Effects of Pre-Streching on Microstructure and Mechanical Properties of Al-4.5Cu-0.8Mg Alloy

Xu Jing; Zheng Kaihong; Wang Shuncheng; Huang Zhenghua; Zhou Nan; Song Dongfu

doi:10.15980/j.tzzz.2017.05.029

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Effects of Pre-Streching on Microstructure and Mechanical Properties of Al-4.5Cu-0.8Mg Alloy
Vol. 37, Issue 5, Pages: 565-567(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.05.029

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[1]徐静,郑开宏,王顺成,黄正华,周楠,宋东福.预变形对Al-4.5Cu-0.8Mg合金组织和性能影响[J].特种铸造及有色合金,2017,37(05):565-567.

Xu Jing, Zheng Kaihong, Wang Shuncheng, et al. Effects of Pre-Streching on Microstructure and Mechanical Properties of Al-4.5Cu-0.8Mg Alloy. [J]. Special Casting & Nonferrous Alloys 37(5):565-567(2017)
[1]徐静,郑开宏,王顺成,黄正华,周楠,宋东福.预变形对Al-4.5Cu-0.8Mg合金组织和性能影响[J].特种铸造及有色合金,2017,37(05):565-567. DOI： 10.15980/j.tzzz.2017.05.029.

Xu Jing, Zheng Kaihong, Wang Shuncheng, et al. Effects of Pre-Streching on Microstructure and Mechanical Properties of Al-4.5Cu-0.8Mg Alloy. [J]. Special Casting & Nonferrous Alloys 37(5):565-567(2017) DOI： 10.15980/j.tzzz.2017.05.029.

摘要

通过对挤压后的Al-4.5Cu-0.8Mg合金棒材进行变形量为0、2%和8%的预拉伸处理

然后进行人工时效处理

研究预变形对Al-4.5Cu-0.8Mg合金人工时效后的硬度、室温拉伸性能和显微组织的影响。结果表明

随着预变形量的增加

合金的时效响应加快

其强度达到峰值的时间逐渐缩短

且峰值强度明显提高。时效前的预变形处理能显著细化合金沉淀析出相

并随预变形程度的增加

析出强化相越弥散、越细小

这有利于阻碍位错的运动和提高合金的强度。

Abstract

The effects of pre-streching prior to artificial aging on microstructure and tensile properties of the Al-4.5Cu-0.8Mg alloy were investigated through tensile testing

hardness testing

metallographic microscope and TEM with pre-streching of 0

2% and 8%.The results show that the aging hardening responsing exhibits obvious with the increase of plastic deformation after quenching

enhancing the peakaged tensile strength and shortening time of tending peak strength.Pre-streching before aging can refine significantly the precipitated phase

and with the increase of the degree of pre-streching

the precipitation strengthening phase is dispersed and refined

which is beneficial to hindering the dislocation movement and enhancing the strength of the alloy.