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<p>To develop cobalt-free, low-cost, high-entropy alloys (HEAs) with excellent mechanical properties, Al<sub><i>x</i></sub>CrFeNi<sub>1.5</sub>Cu<sub>0.5</sub> HEAs were designed via phase diagram calculations (Pandat<sup>TM</sup>) and fabricated by vacuum arc melting and suction casting. The effects of Al content on phase constitution, microstructure, and mechanical properties were systematically investigated. The results show that, with increasing Al content, the alloy structure evolves from a single face-centered cubic (FCC) phase at <i>x</i> = 0.5 to a dual-phase FCC + body-centered cubic (BCC) structure at <i>x</i> = 0.75 and 1.0. Further increasing the Al content to <i>x</i> = 1.25 and 1.5 promotes the precipitation of an ordered B2 phase, leading to the formation of a BCC/B2 structure. Among the studied alloys, the Al<sub>0.75</sub>CrFeNi<sub>1.5</sub>Cu<sub>0.5</sub> HEA, with its heterogeneous FCC + BCC structure, exhibits an excellent combination of strength and plasticity, achieving a compressive strength of 3032&#xa0;MPa and an elongation of 37.69%.</p>

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Heterostructures and Mechanical Properties of Novel Co-free AlxCrFeNi1.5Cu0.5 High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Chen Liang,
  • Hengrui Shao,
  • Yueran Jin,
  • Chenhao Qian,
  • Runyu Bian,
  • Yulong Huang,
  • Dongpeng Wang

摘要

To develop cobalt-free, low-cost, high-entropy alloys (HEAs) with excellent mechanical properties, AlxCrFeNi1.5Cu0.5 HEAs were designed via phase diagram calculations (PandatTM) and fabricated by vacuum arc melting and suction casting. The effects of Al content on phase constitution, microstructure, and mechanical properties were systematically investigated. The results show that, with increasing Al content, the alloy structure evolves from a single face-centered cubic (FCC) phase at x = 0.5 to a dual-phase FCC + body-centered cubic (BCC) structure at x = 0.75 and 1.0. Further increasing the Al content to x = 1.25 and 1.5 promotes the precipitation of an ordered B2 phase, leading to the formation of a BCC/B2 structure. Among the studied alloys, the Al0.75CrFeNi1.5Cu0.5 HEA, with its heterogeneous FCC + BCC structure, exhibits an excellent combination of strength and plasticity, achieving a compressive strength of 3032 MPa and an elongation of 37.69%.