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<p>This investigation establishes an experimental foundation for utilizing submerged and intermittent argon purged stir-casting technique to fabricate aluminum metal matrix composites reinforced with equiatomic CoCrFeNiTi high-entropy alloy (HEAp) particulates at varying weight percentages of 3, 5, 7, and 9 wt%. The microstructure revealed lamellar dendritic regions embed-ded with intermetallic inclusions. Among all composites, the 5 wt% sample (A-5HEAp) exhibited the highest tensile strength of 150 MPa and ductility of 8.56 %. In comparison, the stir-cast pure aluminum matrix (PA) demonstrated a tensile strength of 50 MPa and 45.6 % ductility. X-ray diffraction patterns of the 3 and 5 wt% HEAp-reinforced composites revealed a face-centered cubic (FCC) phase structure. In contrast, the 7 and 9 wt% composites displayed a dualphase structure, comprising FCC, BCC (Fe–Cr rich), and ordered B2 (Al-Ni rich) phases within a solid solution matrix, along with AlFe, AlTi, Cr-rich, and Fe-rich intermetallic inclusions dispersed within the α-Al matrix. The yield strength enhancement in the A-HEAp composites is attributed to a combination of coefficient of thermal expansion (CTE) mismatch, Orowan, and Hall–Petch grain boundary strengthening mechanisms.</p>

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Fabrication of equiatomic CoCrFeNiTi high entropy alloy particulate reinforced aluminium metal matrix composite

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • K. M. B. Karthikeyan,
  • K. Babu

摘要

This investigation establishes an experimental foundation for utilizing submerged and intermittent argon purged stir-casting technique to fabricate aluminum metal matrix composites reinforced with equiatomic CoCrFeNiTi high-entropy alloy (HEAp) particulates at varying weight percentages of 3, 5, 7, and 9 wt%. The microstructure revealed lamellar dendritic regions embed-ded with intermetallic inclusions. Among all composites, the 5 wt% sample (A-5HEAp) exhibited the highest tensile strength of 150 MPa and ductility of 8.56 %. In comparison, the stir-cast pure aluminum matrix (PA) demonstrated a tensile strength of 50 MPa and 45.6 % ductility. X-ray diffraction patterns of the 3 and 5 wt% HEAp-reinforced composites revealed a face-centered cubic (FCC) phase structure. In contrast, the 7 and 9 wt% composites displayed a dualphase structure, comprising FCC, BCC (Fe–Cr rich), and ordered B2 (Al-Ni rich) phases within a solid solution matrix, along with AlFe, AlTi, Cr-rich, and Fe-rich intermetallic inclusions dispersed within the α-Al matrix. The yield strength enhancement in the A-HEAp composites is attributed to a combination of coefficient of thermal expansion (CTE) mismatch, Orowan, and Hall–Petch grain boundary strengthening mechanisms.