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<p>The strengthening of the matrix composite is achieved through microstructural refinement induced by the addition of particle reinforcements, which in turn enhances the mechanical properties. The AA7150-based metal matrix composites were fabricated by the incorporation of nanocrystalline Al4CrFeMnTi0.25 high-entropy particles (NCHEAps) as reinforcement in 0-2&#xa0;wt.% using double-ultrasonic treatment in a two-step stir casting technique. NCHEAps were clubbed in an irregular shape at the grain boundaries of the base alloy. NCHEAps act as an interface and provide space for the nucleation of new small grains to improve the mechanical properties of the composites. The average grain size of Al 7150 alloy was reduced from 108.77 to 23.27&#xa0;µm by 78.6% at 1.5&#xa0;wt.% NCHEAps addition to the AA-NCHEA alloy. The microstructure and properties improvement found at optimized incorporation of HEA 1.5&#xa0;wt.%. Transmission electron microscopy (TEM) images show a uniform distribution of nano-HEA on the Al matrix with proper bonding. The microhardness and ultimate tensile strength of 1.5&#xa0;wt.% HEA-based composite were reported to be 214.49&#xa0;HV and 218.37&#xa0;MPa, respectively, with accumulation of dislocations and twinning defects. The available strengthening methods were evaluated, and Orowan and thermal coefficient of variation (CTE) reinforcement showed a better strengthening effect. Meanwhile, a low dominance of modulus imbalance and grain refinement strengthening was observed. Theoretical strengthening models were analyzed, and the Ramakrishnan model was close to the experimental yield strength values with low error detection.</p>

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Microstructure and Strengthening Mechanisms of Al7150 Composites Reinforced with Al4CrFeMnTi0.25 High-Entropy Alloy Nanoparticles via Ultrasonic Stir Casting

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Vivek Pandey,
  • Deepak Kumar,
  • R. Seetharam,
  • H. Chelladurai

摘要

The strengthening of the matrix composite is achieved through microstructural refinement induced by the addition of particle reinforcements, which in turn enhances the mechanical properties. The AA7150-based metal matrix composites were fabricated by the incorporation of nanocrystalline Al4CrFeMnTi0.25 high-entropy particles (NCHEAps) as reinforcement in 0-2 wt.% using double-ultrasonic treatment in a two-step stir casting technique. NCHEAps were clubbed in an irregular shape at the grain boundaries of the base alloy. NCHEAps act as an interface and provide space for the nucleation of new small grains to improve the mechanical properties of the composites. The average grain size of Al 7150 alloy was reduced from 108.77 to 23.27 µm by 78.6% at 1.5 wt.% NCHEAps addition to the AA-NCHEA alloy. The microstructure and properties improvement found at optimized incorporation of HEA 1.5 wt.%. Transmission electron microscopy (TEM) images show a uniform distribution of nano-HEA on the Al matrix with proper bonding. The microhardness and ultimate tensile strength of 1.5 wt.% HEA-based composite were reported to be 214.49 HV and 218.37 MPa, respectively, with accumulation of dislocations and twinning defects. The available strengthening methods were evaluated, and Orowan and thermal coefficient of variation (CTE) reinforcement showed a better strengthening effect. Meanwhile, a low dominance of modulus imbalance and grain refinement strengthening was observed. Theoretical strengthening models were analyzed, and the Ramakrishnan model was close to the experimental yield strength values with low error detection.