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<p>Laser shock peening (LSP) is an advanced severe plastic deformation–based surface modification technique that can significantly improve the surface integrity and tribological performance of metallic alloys. In the present study, the influence of LSP on the microstructural evolution and wear behavior of AA2024 aluminum alloy was systematically investigated. The average grain size decreased from approximately 103&#xa0;µm in the base alloy to approximately 9.3&#xa0;µm after LSP, indicating nearly 90% refinement, as observed by optical microscopy. SEM–EDS and XRD analyses indicated fragmentation and uniform redistribution of Cu–Mg–rich precipitates, confirming refinement of S (Al<sub>2</sub>CuMg) and θ/θ′ (Al<sub>2</sub>Cu) phases without thermal degradation. Compared with the untreated alloy, the LSP-treated alloy showed a reduction of roughly 35–40% in wear depth and a decrease of 20–25% in coefficient of friction under dry sliding conditions. The dominant wear mechanism changed from severe adhesive and delamination wear to mild abrasive wear, as observed under SEM. Grain refinement, stabilized precipitate distribution, increased surface hardness, and LSP-induced compressive residual stresses all contribute to improved tribological performance.</p>

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Laser Shock Peening–Induced Microstructural Evolution and Its Impact on the Tribological Behavior of Al2024 Alloy

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Kadapa Vijaya Bhaskar Reddy,
  • V. Ravinder Reddy,
  • Kishore Kumar Kandi,
  • P. Prakash,
  • M. Zubairuddin,
  • Y. Shireesha,
  • Shahid Tamboli

摘要

Laser shock peening (LSP) is an advanced severe plastic deformation–based surface modification technique that can significantly improve the surface integrity and tribological performance of metallic alloys. In the present study, the influence of LSP on the microstructural evolution and wear behavior of AA2024 aluminum alloy was systematically investigated. The average grain size decreased from approximately 103 µm in the base alloy to approximately 9.3 µm after LSP, indicating nearly 90% refinement, as observed by optical microscopy. SEM–EDS and XRD analyses indicated fragmentation and uniform redistribution of Cu–Mg–rich precipitates, confirming refinement of S (Al2CuMg) and θ/θ′ (Al2Cu) phases without thermal degradation. Compared with the untreated alloy, the LSP-treated alloy showed a reduction of roughly 35–40% in wear depth and a decrease of 20–25% in coefficient of friction under dry sliding conditions. The dominant wear mechanism changed from severe adhesive and delamination wear to mild abrasive wear, as observed under SEM. Grain refinement, stabilized precipitate distribution, increased surface hardness, and LSP-induced compressive residual stresses all contribute to improved tribological performance.