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Effect of micro-alloying La on precipitation behavior, mechanical properties and electrical conductivity of Al-Mg-Si alloys

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Abstract

The rapid industrial development calls for alloys that possess higher comprehensive properties. In this study, the effect of micro-alloying La addition on the precipitation behavior during artificial aging as well as the mechanical properties and electrical conductivity of Al-Mg-Si alloys were investigated by thermal analysis, microstructural characterizations and properties tests. The results demonstrated that micro-alloying La addition does not change the whole precipitation sequence during the artificial aging of Al-Mg-Si alloys as well as the atomic structure of the precipitates. However, the higher La-vacancy binding energy as well as the strong La-Si and La-Mg interactions can decrease the solubility of Si and Mg in the Al matrix and the β″ precipitation activation energy from 89.9 to 76.7 kJ/mol, leading to the improvement of the strength and electrical conductivity of Al-Mg-Si alloys simultaneously. The microstructural features affecting the strength and electrical conductivity were theoretically discussed in terms of the La addition.

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Authors and Affiliations

  1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    QiuJu Zheng, HongXiang Jiang, Jie He, LiLi Zhang & JiuZhou Zhao

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    QiuJu Zheng, HongXiang Jiang, Jie He & JiuZhou Zhao

Authors
  1. QiuJu Zheng
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  2. HongXiang Jiang
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  3. Jie He
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  4. LiLi Zhang
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  5. JiuZhou Zhao
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Correspondence to HongXiang Jiang or JiuZhou Zhao.

Additional information

This work was supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China (Grant No. 5500-201924129A-0-0-00).

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Zheng, Q., Jiang, H., He, J. et al. Effect of micro-alloying La on precipitation behavior, mechanical properties and electrical conductivity of Al-Mg-Si alloys. Sci. China Technol. Sci. 64, 2012–2022 (2021). https://doi.org/10.1007/s11431-021-1863-5

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  • DOI: https://doi.org/10.1007/s11431-021-1863-5

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