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采用扫描电镜、透射电镜、显微硬度计和万能试验机等研究了Zn对金属型铸造Al-Mg-Si-Cu合金组织和力学性能的影响。利用Avrami-Johnson-Mehl方法计算了合金析出相的动力学参数并构建了析出动力学方程。结果表明：Zn元素在合金中难以形成亚稳和稳定相，但可细化铸态合金的晶粒组织；随着Zn含量的增加，铸态合金晶粒尺寸逐渐减小；尽管Zn元素在合金中并未以析出相的形式存在，但会影响合金的时效析出行为，在时效早期可形成Mg-Zn团簇，过多的Zn含量会导致析出相减少且尺寸更大；Zn有利于提高合金的硬度，但过多的Zn含量会导致T6态合金的硬度增量降低；随着Zn含量的增加，铸态合金的强度逐渐升高，伸长率先增加后减小，断裂模式均为混合型断裂。
Abstract：Effect of Zn on microstructure and mechanical properties of Al-Mg-Si-Cu alloys prepared by permanent mold casting was studied using scanning electron microscopy, transmission electron microscopy, microhardness tester, and universal testing machine. The kinetic parameters of precipitation phases of the alloys were calculated using the Avrami-Johnson-Mehl method, and the precipitation kinetics equation was constructed. The results show that the Zn element is difficult to form metastable and stable phases in the alloys, but can refine the grain structure of the as-cast alloys. As the Zn content increases, the grain size of the as-cast alloys gradually decreases. Although Zn element does not exist in the form of precipitates in the alloys, it can affect the aging precipitation behavior of the alloys, Mg-Zn clusters can be formed in the early stages of aging, and excessive Zn content can lead to a decrease in the number and a increase in the size of precipitates. Zn is beneficial for improving the hardness of the alloys, but excessive Zn content can lead to a decrease in the hardness increment of T6 state alloys. With the increase of Zn content, the strength of the as-cast alloys gradually increases, the elongation first increases and then decreases, and the fracture mode is mixed fracture.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2025-0040
中图分类号:TG146.21
引用信息:
[1]陈伟,冯光明,刘亚刚,等.Zn对金属型铸造Al-Mg-Si-Cu合金组织和力学性能的影响[J].材料热处理学报,2025,46(10):12-21.DOI:10.13289/j.issn.1009-6264.2025-0040.
基金信息:
宁波市重点研发计划暨“揭榜挂帅”项目(2023Z005,2023Z037); 新金属材料国家重点实验室开放基金(2023-Z04)
2025-02-04
2025
2025-09-15
2025
1
2025-10-25
2025-10-25