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<p>This study investigates the influence of the hybrid severe plastic deformation process, combining the multiaxial forging (MAF) and cryorolling (CR), on high cycle fatigue (HCF) and impact toughness behavior of Al–Cu–Li 2099 alloy. The alloy was processed by MAF, followed by CR, and the thickness reduction was 90%. Mechanical properties such as tensile strength, hardness, HCF, and impact toughness were evaluated and correlated with the different microstructural features. The MAF + CR samples exhibited enhanced fatigue strength (123&#xa0;MPa) and high impact toughness (138.69&#xa0;J) compared to the solution-treated specimen, which has a fatigue strength of 105&#xa0;MPa and impact toughness of 110.29&#xa0;J due to the formation of ultrafine-grained microstructure and suppression of dynamic recovery at cryogenic temperature. Post-deformation annealing to 150&#xa0;°C further increases the HCF strength and impact energy to 167&#xa0;MPa and 170.89&#xa0;J, respectively.</p>

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A Study on High Cycle Fatigue and Impact Toughness Behavior of Bulk UFG Al–Cu–Li 2099 Alloy Processed By Hybrid SPD Process

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Atul Bhatt,
  • Amit Joshi,
  • Shiv Dayal Pandey,
  • Ruby Pant,
  • Saurabh Gairola,
  • G. K. Kalavathi,
  • Manoj Kumar Pathak

摘要

This study investigates the influence of the hybrid severe plastic deformation process, combining the multiaxial forging (MAF) and cryorolling (CR), on high cycle fatigue (HCF) and impact toughness behavior of Al–Cu–Li 2099 alloy. The alloy was processed by MAF, followed by CR, and the thickness reduction was 90%. Mechanical properties such as tensile strength, hardness, HCF, and impact toughness were evaluated and correlated with the different microstructural features. The MAF + CR samples exhibited enhanced fatigue strength (123 MPa) and high impact toughness (138.69 J) compared to the solution-treated specimen, which has a fatigue strength of 105 MPa and impact toughness of 110.29 J due to the formation of ultrafine-grained microstructure and suppression of dynamic recovery at cryogenic temperature. Post-deformation annealing to 150 °C further increases the HCF strength and impact energy to 167 MPa and 170.89 J, respectively.