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Microstructure and properties of Al–70Si alloy prepared by laser cladding

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Abstract

In this study, Al–70Si alloy was prepared by laser cladding. The effect of microstructure on the mechanical and thermo-physical properties was elucidated by comparing specimens prepared by laser cladding and casting methods. It is found that the laser cladding process can effectively reduce the formation of coarse primary silicon, which inevitably occurs in large quantities in cast samples. Therefore, various properties have been significantly improved. The tensile strength reaches 85 MPa, the thermal conductivity at room temperature is 76.6 W/(m·K), and the coefficient of thermal expansion (CTE) is 8.19 × 10−6/K. In addition, the solid solution treatment is able to spheroidize the primary silicon and passivate the sharp corners. The change in Si phase morphology can greatly reduce stress concentration and increase the degree of interfacial bonding. This resulted in an increase in tensile strength and thermal conductivity of 50.7% and 42.2%, respectively.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The work was supported by the Natural Science Foundation of Anhui Province (No.1808085ME150).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230000, Anhui, China

    Peng Hua, Ao Liu, Xianfen Li, Rui Li & Yue Cao

  2. School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Wei Zhou

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Contributions

PH: conceptualization, methodology, writing—final version. AL: writing—original draft, analysis. XL: methodology, investigation. RL: methodology, writing—review & editing. YC: writing—review & editing. WZ: resources, conceptualization.

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Correspondence to Peng Hua.

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Hua, P., Liu, A., Li, X. et al. Microstructure and properties of Al–70Si alloy prepared by laser cladding. Journal of Materials Research 38, 4927–4936 (2023). https://doi.org/10.1557/s43578-023-01202-7

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