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Improvement of Microstructure, Mechanical Properties and Corrosion Resistance of Cast Al–12Si Alloy by Friction Stir Processing

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Abstract

Friction stir processing (FSP) was applied to casting and non heat-treated strengthening of Al–12Si aluminum alloy in order to enhance the mechanical properties by improving the microstructure. Moreover, the corrosion resistance of FSPed Al–12Si alloy is also examined. The results indicate that intense plastic deformation during FSP effectively results in the grain refinement of Al–12Si alloy, uniform distribution of Si particles and elimination of cast porosities, and the microstructures of Al–12Si alloy are significantly improved. The microhardness, tensile strength and elongation are increased to 57.15 HV, 159.39 MPa and 9.87% after FSP, respectively, The surface fracture of the FSPed tensile specimen exhibits a typical ductile dimple-fracture. Grain-boundary strengthening and dispersion strengthening of Si particles play important roles in enhancing the mechanical properties. Meanwhile, compared with cast alloy, FSPed Al–12Si alloy has more excellent corrosion resistance.

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Acknowledgements

The work was supported by Basic Science Research Project of Colleges and Universities in Liaoning Province in China (Project number: LG201714).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang Ligong University, Shenyang, 110159, China

    HuanHuan Sun

  2. Beijing Hongshen Education, Dalian, 116000, China

    Shuai Yang

  3. Casting and Melting Plant, Nanshan Light Alloy Co. Ltd, Longkou, 265700, China

    Duo Jin

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  1. HuanHuan Sun
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  2. Shuai Yang
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  3. Duo Jin
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Correspondence to HuanHuan Sun.

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Sun, H., Yang, S. & Jin, D. Improvement of Microstructure, Mechanical Properties and Corrosion Resistance of Cast Al–12Si Alloy by Friction Stir Processing. Trans Indian Inst Met 71, 985–991 (2018). https://doi.org/10.1007/s12666-017-1232-5

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  • DOI: https://doi.org/10.1007/s12666-017-1232-5

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