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<p>This study fabricated four types of Al coatings using cold spray technology: as-deposited, in-situ shot-peened, ex-situ shot-peened, and hybrid in-situ + ex-situ shot-peened coatings. The effects of shot-peening processes on the microstructure and tribological behavior of Al coatings were systematically investigated. The results demonstrate that shot-peening reduces the porosity of the coatings while enhancing their microhardness and wear resistance through grain refinement and work hardening. Among the tested processes, the hybrid in-situ + ex-situ shot-peening exhibited the most comprehensive performance. It achieved a porosity of 1.297%, a hardness of 62.32 HV<sub>0.05</sub>, a grain size of 1.88&#xa0;μm, and a wear rate of 2.938 × 10<sup>−4</sup>&#xa0;mm<sup>3</sup>/N⋅m. The improved wear resistance of the shot-peened Al coating can be attributed to its high-density grain boundaries, which effectively reduce the magnitude and distribution range of the accumulated shear strain during wear.</p>

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Influences of hybrid shot-peening on the microstructure and tribological behavior of cold-sprayed Al coatings

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Song Zeng,
  • Xinliang Zhang,
  • Wenfu Chen,
  • Chang Jiang,
  • Youxing He,
  • Yiyou Wu,
  • Xuebing Yang,
  • Jiuming Yu,
  • Lei Lu,
  • Linwei Zhang

摘要

This study fabricated four types of Al coatings using cold spray technology: as-deposited, in-situ shot-peened, ex-situ shot-peened, and hybrid in-situ + ex-situ shot-peened coatings. The effects of shot-peening processes on the microstructure and tribological behavior of Al coatings were systematically investigated. The results demonstrate that shot-peening reduces the porosity of the coatings while enhancing their microhardness and wear resistance through grain refinement and work hardening. Among the tested processes, the hybrid in-situ + ex-situ shot-peening exhibited the most comprehensive performance. It achieved a porosity of 1.297%, a hardness of 62.32 HV0.05, a grain size of 1.88 μm, and a wear rate of 2.938 × 10−4 mm3/N⋅m. The improved wear resistance of the shot-peened Al coating can be attributed to its high-density grain boundaries, which effectively reduce the magnitude and distribution range of the accumulated shear strain during wear.