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<p>Laser directed energy deposition (LDED) enables the rapid fabrication of TiAl alloy components featuring complex geometries. However, the wear resistance of the as-fabricated TiAl alloy is not satisfactory, limiting its application in high-friction working conditions. This work employed laser shock peening (LSP) to enhance the frictional performance of the LDED Ti45Al8Nb alloy. Through the study of its microstructure, hardness, and tribological behavior, the research reveals the significant beneficial influences of LSP on the structure and properties of LDED-fabricated Ti45Al8Nb alloy. Results demonstrate that LSP treatment significantly improves wear resistance, with weight loss reduced by 52.8% and wear volume decreased by 61.5% compared to the as-deposited condition. Additionally, LSP increases nanohardness by 16.1% and elastic modulus by 10.6%. Microstructure analysis showed that a considerable number of deformed grains were present on the surface of the sample without LSP treatment following the wear test. The wear surface of the LSP-treated sample is characterized by a distinct gradient structure, comprising fine grain layer, equiaxed grain layer, and coarse columnar grain layer. It revealed that the LSP-induced gradient structure and the production of residual stress contributed to the enhancement of wear resistance. This study provides a theoretical basis for improving the tribological performance of additively manufactured TiAl alloy components.</p>

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Enhancement of Frictional Properties in Laser Directed Energy Deposited TiAl Alloy by Laser Shock Peening

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Xiao Yan,
  • Liang Lan,
  • Qilong Zhang,
  • Yuwen Lin,
  • Junlang Liu,
  • Bo He

摘要

Laser directed energy deposition (LDED) enables the rapid fabrication of TiAl alloy components featuring complex geometries. However, the wear resistance of the as-fabricated TiAl alloy is not satisfactory, limiting its application in high-friction working conditions. This work employed laser shock peening (LSP) to enhance the frictional performance of the LDED Ti45Al8Nb alloy. Through the study of its microstructure, hardness, and tribological behavior, the research reveals the significant beneficial influences of LSP on the structure and properties of LDED-fabricated Ti45Al8Nb alloy. Results demonstrate that LSP treatment significantly improves wear resistance, with weight loss reduced by 52.8% and wear volume decreased by 61.5% compared to the as-deposited condition. Additionally, LSP increases nanohardness by 16.1% and elastic modulus by 10.6%. Microstructure analysis showed that a considerable number of deformed grains were present on the surface of the sample without LSP treatment following the wear test. The wear surface of the LSP-treated sample is characterized by a distinct gradient structure, comprising fine grain layer, equiaxed grain layer, and coarse columnar grain layer. It revealed that the LSP-induced gradient structure and the production of residual stress contributed to the enhancement of wear resistance. This study provides a theoretical basis for improving the tribological performance of additively manufactured TiAl alloy components.