Mg、Si含量对Al-Cu-Mg-Ag-Si合金析出相的影响

doi:10.3969/j.issn.0253-6099.2024.01.031

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摘要研究了Mg、Si元素含量对Al-Cu-Mg-Ag-Si合金实际析出相种类及性能的影响。结果表明，Al-Cu-Mg-Ag-Si合金中高Mg含Si合金析出了大量S相和粗大的第二相；低Mg低Si合金中析出了常见的θ相和Ω相；低Mg含Si合金中出现了6系铝合金中常见的σ相和β″相等多种析出相，且具有非常细小弥散的θ相，为合金提供了良好的强化效果。Si和Mg的存在均极大地改变了合金的析出序列，无法通过增加Mg含量抵消Si的作用。Si的加入显著抑制了Ω相的析出，而大幅增加Mg含量则会促进S相的析出。

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	胡奇
	郭一鸣
	章立钢
	刘立斌
	杨佳琳
	高畅

关键词 ：铝合金, Al-Cu-Mg-Ag, 析出相, 硅元素, 镁元素

Abstract：The influence of Mg and Si content on the types and properties of actual precipitates in Al-Cu-Mg-Ag-Si alloy was investigated. The results show that a large amount of S phase and coarse second phases exist in the Al-Cu-Mg-Ag-Sialloy with high Mg content and regular Si content; the common θ phase and Ω phase are precipitated in the low-Mg and low-Si alloy; the common second phases in 6xxx aluminum alloys, such as σ and β″ phases, appear in the alloy with low Mg content and regular Si content, and also fine and dispersed θ phases are precipitated in the alloy, which results in excellent strengthening effect of the alloy. Both Si and Mg greatly alter the precipitation sequence of the alloy, and the effect of Si cannot be offset by increasing Mg content. The addition of Si significantly inhibits the precipitation of Ω phase, while a considerable increase of Mg content can promote the precipitation of S phase.

Key words： aluminum alloy Al-Cu-Mg-Ag precipitated phase Si element Mg element

收稿日期: 2023-08-27

基金资助:国家自然科学基金(51871248)

通讯作者: 章立钢(1982—)，男，浙江上虞人，教授，博士研究生导师，主要从事材料基因工程及材料大数据工作。E-mail:ligangzhang@csu.edu.cn

作者简介: 胡奇(1998—)，男，湖南常德人，硕士，主要从事耐热铝合金热力学及析出相工作。E-mail:203112137@csu.edu.cn

引用本文:

胡奇, 郭一鸣, 章立钢, 刘立斌, 杨佳琳, 高畅. Mg、Si含量对Al-Cu-Mg-Ag-Si合金析出相的影响[J]. 矿冶工程, 2024, 44(1): 143-146.
HU Qi, GUO Yiming, ZHANG Ligang, LIU Libin, YANG Jialin, GAO Chang. Influence of Mg and Si Content on Precipitates of Al-Cu-Mg-Ag-Si Alloy. Mining and Metallurgical Engineering, 2024, 44(1): 143-146.

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