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Improvements on the Mechanical Properties of Al 6063 Alloy by Microalloying with Cu and Cr Elements

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Abstract

Microalloying is an effective method to improve the mechanical properties of 6063 Al–Mg–Si alloy. Here, in this work, the effects of trace Cu (0.14 wt.%) and Cr (0.10 wt.%.) additions on the microstructure and mechanical properties of 6063 Al–Mg–Si alloy were studied. The results show that the additions of two elements can cause significant age-hardening effects, and the yield and tensile strengths of the alloys are significantly increased after T6 heat treatment. Further, it is found that the Cu and Cr additions show different strengthening mechanisms in the alloy. Cu addition leads to a finer and denser distribution of the main strengthening phases in the peak aging of the alloy, as well as a large number density of the precipitated phases, resulting in an increase in the dislocation density of the alloy during strain and hindering the dislocation movement. However, Cr addition acts as an inhibitor of grain growth and results in grain refinement, which also increases the hindrance of dislocation movement during the plastic deformation of the alloy, resulting in an increase in the dislocation density, thereby strengthening the alloy.

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The date presented in this study are available within the article.

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Acknowledgments

This research was financially supported by the Natural Science Foundation of Liaoning Province (No: 2022-BS-181) and the Scientific Research Funding Project of Liaoning Education Department (No: LJKZ0118).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Xiangchen Meng, Wei Zhang, Yuqi Ma, Qingchun Xiang, Yinglei Ren & Keqiang Qiu

  2. Key Laboratory of Light Metal Materials and Engineering at Universities of Liaoning Province, Shenyang University of Technology, Shenyang, 110870, People’s Republic of China

    Wei Zhang

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  1. Xiangchen Meng
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Contributions

Xiangchen Meng was involved in writing—original draft preparation, investigation, and visualization. Wei Zhang contributed to methodology, writing—review and editing, and funding acquisition. Yuqi Ma was involved in software and formal analysis. Qingchun Xiang contributed to conceptualization and resources. Yinglei Ren was involved in data curation and supervision. Keqiang Qiu contributed to project administration and writing—review and editing.

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Correspondence to Wei Zhang or Qingchun Xiang.

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Meng, X., Zhang, W., Ma, Y. et al. Improvements on the Mechanical Properties of Al 6063 Alloy by Microalloying with Cu and Cr Elements. Inter Metalcast 18, 1309–1317 (2024). https://doi.org/10.1007/s40962-023-01110-w

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