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<p>This study deals into the impact of laser shock peening (LSP) on the microstructural features, residual stress distribution, and mechanical characteristics of the Al 5083 alloy. Optical microscopy shows significant grain refinement, decreasing grain size from ~ 100&#xa0;μm in the base metal to ~ 8&#xa0;μm in the LSP-treated alloy. SEM and EDS analyses reveal precipitate refinement from ~ 2&#xa0;μm to ~ 0.5&#xa0;μm, resulting in improved elemental distribution and lower oxide content. Residual stress measurements indicate the presence of deep compressive stresses up to 750&#xa0;μm depth, with a peak compressive stress of -312&#xa0;MPa at the surface, improving fatigue resistance. The hardness increases from 112 HV in the base alloy to 124 HV in the LSP-treated alloy due to grain refinement and dislocation pinning by refined precipitates. Tensile tests show increased ultimate tensile strength (346&#xa0;MPa) but slight reductions in yield strength (255&#xa0;MPa) and ductility (13.1%) due to work hardening. The SEM fracture morphology shows a transition from ductile dimples in the base alloy to a mixed fracture mode in the LSP-treated alloy, which correlates with increased strength and toughness. These findings show that LSP can potentially improve the mechanical performance and structural integrity of the Al 5083 alloy for advanced engineering applications.</p>

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Correlating Microstructure, Residual Stress, and Mechanical Properties of Al 5083 Alloy Treated with Laser Shock Peening

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Ayinala Naga Sai,
  • V. V. M. J. Satish Chembuly,
  • Chitturi Ram Prasad,
  • Praveen Mathi,
  • Rama Bhadri Raju Chekuri,
  • Ravi Varma Penmetsa

摘要

This study deals into the impact of laser shock peening (LSP) on the microstructural features, residual stress distribution, and mechanical characteristics of the Al 5083 alloy. Optical microscopy shows significant grain refinement, decreasing grain size from ~ 100 μm in the base metal to ~ 8 μm in the LSP-treated alloy. SEM and EDS analyses reveal precipitate refinement from ~ 2 μm to ~ 0.5 μm, resulting in improved elemental distribution and lower oxide content. Residual stress measurements indicate the presence of deep compressive stresses up to 750 μm depth, with a peak compressive stress of -312 MPa at the surface, improving fatigue resistance. The hardness increases from 112 HV in the base alloy to 124 HV in the LSP-treated alloy due to grain refinement and dislocation pinning by refined precipitates. Tensile tests show increased ultimate tensile strength (346 MPa) but slight reductions in yield strength (255 MPa) and ductility (13.1%) due to work hardening. The SEM fracture morphology shows a transition from ductile dimples in the base alloy to a mixed fracture mode in the LSP-treated alloy, which correlates with increased strength and toughness. These findings show that LSP can potentially improve the mechanical performance and structural integrity of the Al 5083 alloy for advanced engineering applications.