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<p>This work used a vacuum arc melting furnace to generate cobalt-free, low-cost Al<sub>1-x</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>x</sub> (<i>x</i> = 0, 0.1, 0.25, 0.35, and 0.45) high-entropy alloys, with the goal of evaluating the effects of Al and Nb synergistic alloying on the microstructure and mechanical properties of CrFe<sub>2</sub>Ni<sub>2</sub>-based alloys. In this study, the base alloy consists of a primary FCC phase and FCC + B2 two-phase eutectic, while other alloys comprise primary FCC phase, two-phase eutectic, and FCC + B2 + Laves three-phase eutectic. The two-phase eutectic of Al<sub>0.9</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>0.1</sub>, Al<sub>0.75</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>0.25</sub>, and Al<sub>0.65</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>0.35</sub> is FCC + B2, whereas that of Al<sub>0.55</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>0.45</sub> changes to FCC + Laves. The Al<sub>1-x</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>x</sub> alloy’s compressive yield strength improves from 505 (AlCrFe<sub>2</sub>Ni<sub>2</sub>) to 1107&#xa0;MPa (Al<sub>0.55</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>0.45</sub>) as the Nb concentration rises, while the plastic strain falls from 37.1 to 23.1%. In terms of yield strength, fracture strength, and plastic strain, the Al<sub>0.65</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>0.35</sub> alloy has the best overall characteristics, measuring 919&#xa0;MPa, 2085&#xa0;MPa, and 32.8%, respectively. The Laves phase is the main contributor to the yield strength of high-entropy alloys with the composition Al<sub>1-x</sub>CrFe<sub>2</sub>Ni<sub>2</sub>Nb<sub>x</sub> (<i>x</i> = 0.1, 0.25, 0.35, and 0.45), according to calculations based on the mixing rule.</p>

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Microstructure and Mechanical Properties of Al1-xCrFe2Ni2Nbx High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Guoxin Wu,
  • Li Sun,
  • Yiren Rong,
  • Jiajia Guo,
  • Fanghui Zhu,
  • Jingjie Cao,
  • Xicong Ye

摘要

This work used a vacuum arc melting furnace to generate cobalt-free, low-cost Al1-xCrFe2Ni2Nbx (x = 0, 0.1, 0.25, 0.35, and 0.45) high-entropy alloys, with the goal of evaluating the effects of Al and Nb synergistic alloying on the microstructure and mechanical properties of CrFe2Ni2-based alloys. In this study, the base alloy consists of a primary FCC phase and FCC + B2 two-phase eutectic, while other alloys comprise primary FCC phase, two-phase eutectic, and FCC + B2 + Laves three-phase eutectic. The two-phase eutectic of Al0.9CrFe2Ni2Nb0.1, Al0.75CrFe2Ni2Nb0.25, and Al0.65CrFe2Ni2Nb0.35 is FCC + B2, whereas that of Al0.55CrFe2Ni2Nb0.45 changes to FCC + Laves. The Al1-xCrFe2Ni2Nbx alloy’s compressive yield strength improves from 505 (AlCrFe2Ni2) to 1107 MPa (Al0.55CrFe2Ni2Nb0.45) as the Nb concentration rises, while the plastic strain falls from 37.1 to 23.1%. In terms of yield strength, fracture strength, and plastic strain, the Al0.65CrFe2Ni2Nb0.35 alloy has the best overall characteristics, measuring 919 MPa, 2085 MPa, and 32.8%, respectively. The Laves phase is the main contributor to the yield strength of high-entropy alloys with the composition Al1-xCrFe2Ni2Nbx (x = 0.1, 0.25, 0.35, and 0.45), according to calculations based on the mixing rule.