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Mechanical properties, microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu alloy after solution heat treatment

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Abstract

The effect of solution heat treatment (SHT) on mechanical properties, microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu-0.6Zn alloy was investigated by tensile test, Erichsen test, surface topography, scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD). The results indicate that with the increase in SHT temperature, yield strength and cupping test value (I E) of the sheets increase greatly and reach a peak value, then decrease. Meanwhile, intermetallic compounds dissolve into matrix gradually. The grains grow up as SHT temperature increases, and abnormal grain growth leads to the surface defects after solution-treated above 560 °C. Considering mechanical properties, I E value, residual phases, grain size and surface quality of the sheets, SHT temperature for the alloy should not be higher than 550 °C.

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Acknowledgments

This study was financially supported by the National Program on Key Basic Research Project of China (No. 2012CB619504) and the National Natural Science Foundation of China (No. 51271037). The authors wish to thank Dr. Xiao-Lei Han for EBSD work.

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Authors and Affiliations

  1. State Key Laboratory for Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    Li-Zhen Yan, Yong-An Zhang, Bai-Qing Xiong, Xi-Wu Li, Zhi-Hui Li, Hong-Wei Liu & Shu-Hui Huang

  2. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, 110004, China

    Gang Zhao

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  1. Li-Zhen Yan
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Correspondence to Yong-An Zhang.

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Yan, LZ., Zhang, YA., Xiong, BQ. et al. Mechanical properties, microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu alloy after solution heat treatment. Rare Met. 36, 550–555 (2017). https://doi.org/10.1007/s12598-015-0623-1

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  • DOI: https://doi.org/10.1007/s12598-015-0623-1

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