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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Influence of Si contents on the microstructure evolution and mechanical properties of Al-Mg-Si-Cu-Zn alloys
Liang Zhu1, Mingxing Guo1, Zhang Jishan1, Li Gaojie1, Wang Yu1, Zhuang Linzhong2,3
1.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083;2.1.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083;3.2. Tata Steel, 1970 CA Ijmuiden, Netherlands
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 45o 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 property
DOI:10.11916/j.issn.1005-9113.18098
Clc Number:TG146.2
Fund:

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