Si对Al-1.5Cu-0.7Mg合金组织和性能的影响

doi:10.13251/j.issn.0254-6051.2024.02.008

金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 53-59.DOI: 10.13251/j.issn.0254-6051.2024.02.008

Si对Al-1.5Cu-0.7Mg合金组织和性能的影响

谭鑫禹, 刘静静, 刘东雨

华北电力大学能源动力与机械工程学院, 北京 102206

收稿日期:2023-09-04 修回日期:2023-12-27 出版日期:2024-03-27 发布日期:2024-03-27
通讯作者: 刘静静,副教授,博士,E-mail:ljj@ncepu.edu.cn
作者简介:谭鑫禹(1998—),男,硕士研究生,主要研究方向为先进金属材料,E-mail:tanxinyu111111@126.com。

Effect of Si on microstructure and properties of Al-1.5Cu-0.7Mg alloy

Tan Xinyu, Liu Jingjing, Liu Dongyu

School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2023-09-04 Revised:2023-12-27 Online:2024-03-27 Published:2024-03-27

摘要/Abstract

摘要： 通过力学性能测试、20 ℃电阻率测试及显微组织观察,研究了Si加入量为0.3wt%时对Al-1.5Cu-0.7Mg合金组织和性能的影响。结果表明,当Si加入量为0.3wt%时,Al-1.5Cu-0.7Mg合金时效态的强度明显提高,经473~493 K峰时效后,其20 ℃电阻率为3.638~3.667 μΩ·cm,抗拉强度为370~380 MPa。根据马蒂森定律建立了20 ℃电阻率与时效析出第二相相对体积分数之间的关系式。利用JMA(Johnson-Mehl-Avrami)方程得出Al-1.5Cu-0.7Mg和Al-1.5Cu-0.7Mg-0.3Si合金的时效析出激活能分别为135 kJ/mol和204 kJ/mol,由此可判定,Al-1.5Cu-0.7Mg合金以S″相为主,Al-1.5Cu-0.7Mg-0.3Si合金以S相为主。由JMA方程对其他时效参数下的电阻率进行预测,预测模型的准确性在99%以上。

关键词: Al-1.5Cu-0.7Mg合金, Si, 电阻率, 抗拉强度, 第二相, 析出激活能

Abstract: Effect of 0.3wt%Si addition on the microstructure and mechanical properties of Al-1.5Cu-0.7Mg alloy was studied by means of mechanical test, resistivity test at 20 ℃ and microstructure observation. The results show that with the 0.3wt%Si addition, the as-aged strength of the tested alloy is obviously increased. After peak aging at 473-493 K, its 20 ℃ resistivity is 3.638-3.667 μΩ·cm, and its tensile strength is 370-380 MPa, and then the relationship between the 20 ℃ resistivity and the relative volume fraction of the second phase precipitated during aging is established according to Matthiessen rule. The second phase precipitation activation energies in aging of the Al-1.5Cu-0.7Mg and Al-1.5Cu-0.7Mg-0.3Si alloys obtained by using JMA (Johnson-Mehl-Avrami) equation are 135 kJ/mol and 204 kJ/mol respectively, according to which to know that the S″ phase is dominant in the Al-1.5Cu-0.7Mg alloy and the S phase is dominant in the Al-1.5Cu-0.7Mg-0.3Si alloy. The resistivity under other aging parameters is also predicted by JMA equation, and the accuracy of the prediction model is all over 99%.

Key words: Al-1.5Cu-0.7Mg alloy, Si, resistivity, tensile strength, second phase, precipitation activation energy

中图分类号:

TG166.3

谭鑫禹, 刘静静, 刘东雨. Si对Al-1.5Cu-0.7Mg合金组织和性能的影响[J]. 金属热处理, 2024, 49(2): 53-59.

Tan Xinyu, Liu Jingjing, Liu Dongyu. Effect of Si on microstructure and properties of Al-1.5Cu-0.7Mg alloy[J]. Heat Treatment of Metals, 2024, 49(2): 53-59.

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Si对Al-1.5Cu-0.7Mg合金组织和性能的影响

Effect of Si on microstructure and properties of Al-1.5Cu-0.7Mg alloy

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