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<p>Friction stir processing (FSP) is an effective method for fabricating high-entropy alloy-reinforced aluminum matrix composites. As a key process parameter, the traverse speed significantly affects the heat input per unit length, and its effects on the final composite properties remain to be elucidated. In this study, the regulatory mechanisms of different traverse speeds on the microstructure, mechanical and tribological properties of composites were investigated. The results demonstrated that as traverse speed increases, the proportion of dynamic recrystallization of the nugget zone (NZ) rises and the grain size is obviously refined. The average grain size decreases from 4.14 to 2.17&#xa0;μm. The ultimate tensile strength of the composites increases with the rising traverse speed, reaching a maximum of 398.0&#xa0;MPa, which represents 70.4% of the base material (BM) strength. In addition, compared to the BM, the composites demonstrate superior wear resistance, with the wear rate reduced by up to 85.09%. This excellent performance results from the synergistic action of HEA particles' load-bearing effect and grain refinement mechanism. Fractographic analysis revealed two failure modes of HEA particles: particle fracture and interfacial debonding, demonstrating the effective load transfer capability of the metallic bonded interface.</p>

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Tailoring Microstructural Evolution, Mechanical and Tribological Properties of Friction Stir Processed HEAp/AA7075 Composites through Traverse Speed Control

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Lisheng Zuo,
  • Huashu Tao,
  • Xingquan Zhang,
  • Lin Dai,
  • Ziyu Wang

摘要

Friction stir processing (FSP) is an effective method for fabricating high-entropy alloy-reinforced aluminum matrix composites. As a key process parameter, the traverse speed significantly affects the heat input per unit length, and its effects on the final composite properties remain to be elucidated. In this study, the regulatory mechanisms of different traverse speeds on the microstructure, mechanical and tribological properties of composites were investigated. The results demonstrated that as traverse speed increases, the proportion of dynamic recrystallization of the nugget zone (NZ) rises and the grain size is obviously refined. The average grain size decreases from 4.14 to 2.17 μm. The ultimate tensile strength of the composites increases with the rising traverse speed, reaching a maximum of 398.0 MPa, which represents 70.4% of the base material (BM) strength. In addition, compared to the BM, the composites demonstrate superior wear resistance, with the wear rate reduced by up to 85.09%. This excellent performance results from the synergistic action of HEA particles' load-bearing effect and grain refinement mechanism. Fractographic analysis revealed two failure modes of HEA particles: particle fracture and interfacial debonding, demonstrating the effective load transfer capability of the metallic bonded interface.