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<p>This study investigates the enhancement of fatigue performance in CoCrFeNiAl<sub>x</sub> (<i>x</i> = 0, 0.6, 1) high-entropy alloys (HEAs) through water jet peening (WJP). Finite element simulations were employed to evaluate the effects of varying jet velocities and aluminum content on residual stress, surface roughness, and fatigue life. Results show that both the magnitude and depth of residual compressive stress increase with jet velocity. For instance, in Al<sub>0</sub> samples, the depth of residual compressive stress grew from 80&#xa0;μm at 150&#xa0;mm/s to 159.4&#xa0;μm at 250&#xa0;mm/s. Similarly, Al<sub>1</sub> samples exhibited a maximum compressive stress increase from 147.3 to 394.5&#xa0;MPa as jet velocity increased. Surface roughness also increased with velocity, following the trend Al<sub>0</sub> &gt; Al<sub>0.6</sub> &gt; Al<sub>1</sub>. At 250&#xa0;mm/s, roughness values were 1.36&#xa0;μm, 0.61&#xa0;μm, and 0.22&#xa0;μm, respectively. Fatigue life improved with higher Al content but showed non-monotonic trends with jet speed due to competing effects of surface roughness and compressive stress. Notably, excessive roughness in Al<sub>0</sub> samples treated at 250&#xa0;mm/s reduced fatigue life compared to those treated at 225&#xa0;mm/s, due to localized stress concentrations from edge deformation.</p>

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Investigation of Water Jet Peening Mechanism and Fatigue Performance of CoCrFeNiAlx High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Ping Zhang,
  • Yeran Gao,
  • Xiaomin Jiang,
  • Tengfei Zhang,
  • Yan Yu

摘要

This study investigates the enhancement of fatigue performance in CoCrFeNiAlx (x = 0, 0.6, 1) high-entropy alloys (HEAs) through water jet peening (WJP). Finite element simulations were employed to evaluate the effects of varying jet velocities and aluminum content on residual stress, surface roughness, and fatigue life. Results show that both the magnitude and depth of residual compressive stress increase with jet velocity. For instance, in Al0 samples, the depth of residual compressive stress grew from 80 μm at 150 mm/s to 159.4 μm at 250 mm/s. Similarly, Al1 samples exhibited a maximum compressive stress increase from 147.3 to 394.5 MPa as jet velocity increased. Surface roughness also increased with velocity, following the trend Al0 > Al0.6 > Al1. At 250 mm/s, roughness values were 1.36 μm, 0.61 μm, and 0.22 μm, respectively. Fatigue life improved with higher Al content but showed non-monotonic trends with jet speed due to competing effects of surface roughness and compressive stress. Notably, excessive roughness in Al0 samples treated at 250 mm/s reduced fatigue life compared to those treated at 225 mm/s, due to localized stress concentrations from edge deformation.