| Related citation: | Liang Zhu,Mingxing Guo,Jishan Zhang,Gaojie Li,Yu Wang,Linzhong Zhuang.Influence of Si Contents on the Microstructure Evolution and Mechanical Properties of Al-Mg-Si-Cu-Zn Alloys[J].Journal of Harbin Institute Of Technology(New Series),2020,27(1):10-18.DOI:10.11916/j.issn.1005-9113.18098. |
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| Author Name | Affiliation | | Liang Zhu | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China | | Mingxing Guo | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China | | Jishan Zhang | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China | | Gaojie Li | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China | | Yu Wang | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China | | Linzhong Zhuang | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Tata Steel, 1970 CA Ijmuiden, Netherlands |
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| Abstract: |
| The influence of different Si contents on the microstructure evolution and mechanical properties of Al-Mg-Si-Cu-Zn alloys was systematically studied using tensile testing, OM, SEM, EDS, and EBSD. The results indicate that the grain size of as-cast alloys was gradually reduced with the increase of the Si content, which mainly resulted from the formation of many iron-rich phases and precipitates during the casting process. During homogenization treatment, the plate-like β-AlFeSi phases in the alloy with a higher Si content easily transformed to the spherical α-Al(FeMn)Si phases, which is helpful for improving the formability of alloys. The microstructure evolution of the alloys was also greatly dependent on the content of Si that the number density and homogeneous distribution level of precipitates in the final cold rolled alloys both increased with the increase of the Si content, which further provided a positive effect on the formation of fine recrystallization grains during the subsequent solution treatment. As a result, the yield strength, ultimate tensile strength, and elongation of the pre-aged alloys in the direction of 45°with respect to the rolling direction were all increased with increasing Si content. |
| Key words: Al-Mg-Si-Cu-Zn alloy Mg/Si ratio microstructure evolution mechanical properties |
| DOI：10.11916/j.issn.1005-9113.18098 |
| Clc Number:TG146.2 |
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| Descriptions in Chinese: |
| Si含量对Al-Mg-Si-Cu-Zn合金微观组织演变和力学性能的影响 朱亮1，郭明星1,2， 张济山1,2，李高洁1， 王宇1，庄林忠1,2 （1. 北京科技大学 新金属材料国家重点实验室，北京100083； 2.塔塔钢铁公司，1970 CA，艾默伊登, 荷兰） 摘要：通过拉伸试验，并利用光学显微镜（OM）、扫描电镜（SEM）、X射线能谱分析（EDS）和电子背散射衍射（EBSD）系统研究了不同Si含量对Al-Mg-Si-Cu-Zn合金组织演变和力学性能的影响。结果表明，随着Si含量的增加，铸态合金中形成的富铁相和析出相逐渐增加，从而使得铸态晶粒尺寸逐渐减小。随后在均匀化过程中，Si含量越高，合金中的板条状的β-AlFeSi相越易转变为更有利于改善合金成形性的球状α-Al(FeMn)Si 相。热加工过程中合金的组织演变主要受Si含量的影响，最终冷轧态合金中析出相的密度和均匀性分布均随Si含量的增加而增加，使得固溶处理过程中的再结晶晶粒尺寸被细化。因此，沿着45°轧制方向的预时效态合金的屈服强度，抗拉强度和延伸率均随着Si含量的增加而增加。 关键词：Al-Mg-Si-Cu-Zn合金，Mg/Si比，组织演变，力学性能 |
