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<p>In this study, a combined surface strengthening approach employing shot peening (SP) and laser shock peening (LSP) was applied to 7075 aluminum alloy. The effects of these surface treatment techniques on the fatigue performance of the alloy were systematically investigated through tension-compression fatigue tests. The experimental results revealed that as the SP coverage increased from 100% to 200%, the surface roughness (Ra) rose from 1.04&#xa0;μm to 1.46&#xa0;μm, corresponding to an increase of 23.1% to 14.0%. Similarly, an increase in the shot impact velocity led to a significant rise in surface roughness, from 0.86&#xa0;μm to 1.6&#xa0;μm, representing a growth of 53.8%. Moreover, the surface residual compressive stress was enhanced with increasing SP coverage and impact velocity. At a 200% coverage, the residual stress reached − 295.81&#xa0;MPa, exhibiting an increment of 21.7&#xa0;MPa, while at an impact velocity of 50&#xa0;m/s, the residual stress attained − 311.3&#xa0;MPa, corresponding to a rise of 43.2&#xa0;MPa. The subsequent application of LSP further refined the surface morphology by mitigating the non-uniformity introduced by SP and effectively enhanced tension-compression fatigue life of the material. These findings demonstrate that the combined SP-LSP treatment significantly improves the fatigue resistance and crack propagation inhibition capability of 7075 aluminum alloy.</p>

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Effects of Combined Shot Peening and Laser Shock Peening on the Fatigue Life of 7075 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Ping Zhang,
  • Yajie Sun,
  • Xiujie Yue

摘要

In this study, a combined surface strengthening approach employing shot peening (SP) and laser shock peening (LSP) was applied to 7075 aluminum alloy. The effects of these surface treatment techniques on the fatigue performance of the alloy were systematically investigated through tension-compression fatigue tests. The experimental results revealed that as the SP coverage increased from 100% to 200%, the surface roughness (Ra) rose from 1.04 μm to 1.46 μm, corresponding to an increase of 23.1% to 14.0%. Similarly, an increase in the shot impact velocity led to a significant rise in surface roughness, from 0.86 μm to 1.6 μm, representing a growth of 53.8%. Moreover, the surface residual compressive stress was enhanced with increasing SP coverage and impact velocity. At a 200% coverage, the residual stress reached − 295.81 MPa, exhibiting an increment of 21.7 MPa, while at an impact velocity of 50 m/s, the residual stress attained − 311.3 MPa, corresponding to a rise of 43.2 MPa. The subsequent application of LSP further refined the surface morphology by mitigating the non-uniformity introduced by SP and effectively enhanced tension-compression fatigue life of the material. These findings demonstrate that the combined SP-LSP treatment significantly improves the fatigue resistance and crack propagation inhibition capability of 7075 aluminum alloy.