镁与热处理对Al-4Si-(xMg)合金导电性及力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.01.019

金属热处理 ›› 2021, Vol. 46 ›› Issue (1): 97-103.DOI: 10.13251/j.issn.0254-6051.2021.01.019

镁与热处理对Al-4Si-(xMg)合金导电性及力学性能的影响

叶辉, 崔晓丽, 崔红卫, 李星辉, 祝泽, 赵娟

山东理工大学材料科学与工程学院,山东淄博 255000

收稿日期:2020-06-22 出版日期:2021-01-25 发布日期:2021-01-26
通讯作者: 崔晓丽,讲师,博士,E-mail:cuixiaoli111@163.com
作者简介:叶辉(1995—),男,硕士研究生,主要研究方向为导电铝合金的组织和性能,E-mail:1119644915@qq.com。
基金资助:
国家自然科学基金青年基金(51804189);国家博士后基金面上项目(2019M662404);山东省自然科学基金博士基金(ZR2017BEM004)

Effect of magnesium and heat treatment on electrical conductivity andmechanical properties of Al-4Si-(xMg) alloys

Ye Hui, Cui Xiaoli, Cui Hongwei, Li Xinghui, Zhu Ze, Zhao Juan

School of Materials Science and Engineering,Shandong University of Technology,Zibo Shandong 255000,China

Received:2020-06-22 Online:2021-01-25 Published:2021-01-26

摘要/Abstract

摘要： 利用SEM、XRD、EDS、硬度计及电阻率测试仪等方法分析Mg元素和不同热处理对Al-4Si-(xMg)(x=0~1.5%,质量分数)系列合金导电率及硬度的影响。结果表明:随Mg添加量增加,铸态合金的导电率和硬度先增后减,最佳添加量为1.1%。Mg使铸态合金硬度显著增加,但恶化了其导电率。Al-4Si-(xMg) 合金经不同热处理后,合金导电率大幅提高,硬度略有降低。其中,固溶时效对合金导电率的提高最显著,硬度降低幅度最小,使Al-4Si-1.1Mg合金导电率和硬度匹配关系最好。通过Mg元素和固溶时效的协同作用,可使铸态Al-4Si合金导电率由43.3%IACS提高至50.9%IACS,硬度由41.5 HV0.5增加至84.3 HV0.5。

关键词: Mg元素, 热处理, Al-4Si合金, 导电率, 硬度

Abstract: Effects of Mg addition and different heat treatments on the electrical conductivity and hardness of Al-4Si-(xMg) (x=0-1.5%,mass fraction) alloys were analyzed by SEM,XRD,EDS,hardness tester and resistivity tester.The results show that for the as-cast alloys,the electrical conductivity and hardness increase first and then decrease with the increase of Mg addition and 1.1% is the optimum addition of Mg,while the Mg addition significantly improves the hardness,but damages the electrical conductivity.After different heat treatments,the electrical conductivity of Al-4Si-(xMg) alloys greatly increases and the hardness slightly decreases,where the solid solution+aging treatment significantly increase the electrical conductivity but reduce the hardness to the minimum,so that the Al-4Si-1.1Mg alloy has the best matching between electrical conductivity and hardness.Through the synergistic effect of Mg addition and solid solution+aging treatment,the electrical conductivity of the as-cast Al-4Si alloy can be improved from 43.3%IACS to 50.9%IACS,the hardness can be increased from 41.5 HV0.5 to 84.3 HV0.5.

Key words: magnesium element, heat treatment, Al-4Si alloy, electrical conductivity, hardness

中图分类号:

叶辉, 崔晓丽, 崔红卫, 李星辉, 祝泽, 赵娟. 镁与热处理对Al-4Si-(xMg)合金导电性及力学性能的影响[J]. 金属热处理, 2021, 46(1): 97-103.

Ye Hui, Cui Xiaoli, Cui Hongwei, Li Xinghui, Zhu Ze, Zhao Juan. Effect of magnesium and heat treatment on electrical conductivity andmechanical properties of Al-4Si-(xMg) alloys[J]. Heat Treatment of Metals, 2021, 46(1): 97-103.

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镁与热处理对Al-4Si-(xMg)合金导电性及力学性能的影响

Effect of magnesium and heat treatment on electrical conductivity andmechanical properties of Al-4Si-(xMg) alloys

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