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Tensile properties and fracture behavior of Al–8Si alloy sheets with different Mg under natural aging

  • Metals & corrosion
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Abstract

In this study, we conducted an extensive analysis and research of the microstructure, mechanical features, and fracture behaviors of Al–8Si–xMg alloy sheets under natural aging. The results reveal that while the dimensions of GP zones remained relatively unchanged with increasing Mg concentrations, their volume fraction progressively increased before reaching a plateau. It was observed that at a Mg concentration of 1.32%, numerous particles clustered areas comprising Mg2Si and Si particles were discovered. With the increase of Mg concentration in the alloy sheets, there was an initial uptick in strength, followed by a minor decline thereafter. Concurrently, the elongation consistently exhibited a reduction. The yield strength of Al–8Si alloy sheets under natural aging, incorporating varying Mg content levels, was precisely predicted. Moreover, the predicted value demonstrated strong agreement with the actual data obtained. Additionally, this research illuminated the impact of diverse strengthening mechanisms on the yield strength. Under tensile stress, the experimental alloy sheets exhibited a ductile fracture mechanism. Initially, as the Mg concentration increased, the quantity of dimples on the fracture surface remained steady, then slightly increased, while the depth of these dimples progressively became shallower and their size slightly decreased. Additionally, a rise in Mg content led to a smoother texture on the alloy sheets’ surface after undergoing tensile fracture. Secondary fractures reduced in quantity, and some secondary cracks bypassed the Si particles. Moreover, the quantity of cracked Si particles gradually grew.

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Acknowledgements

The research was financially supported by the basic scientific research projects of colleges and universities in Liaoning Province (No. XB2023007). The corresponding author would like to acknowledge the research group of Gang Zhao and Ni Tian of Northeastern University for providing experimental alloys and corresponding experimental resources.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou, 121001, China

    Guangdong Wang & Yue Tian

  2. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Yiran Zhou

  3. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Jingyi Cao

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  1. Guangdong Wang
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  2. Yiran Zhou
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  3. Jingyi Cao
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  4. Yue Tian
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Contributions

Guangdong Wang provided conceptualization, methodology, investigation, formal analysis, writing—original draft, and writing—review & editing. Yiran Zhou presented methodology, investigation, formal analysis, and resources. Jingyi Cao analyzed conceptualization, methodology, and formal analysis. Yue Tian prepared writing—review & editing.

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Correspondence to Guangdong Wang.

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Wang, G., Zhou, Y., Cao, J. et al. Tensile properties and fracture behavior of Al–8Si alloy sheets with different Mg under natural aging. J Mater Sci 59, 7368–7386 (2024). https://doi.org/10.1007/s10853-024-09604-6

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