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<p>In order to enhance the high-temperature fracture toughness of high-entropy alloy, the phase composition, microstructure evolution, fracture toughness and crack propagation behavior of Al<sub>0.3</sub>CrFeNiCu<sub>1.5</sub>Mo<sub>x</sub> alloy with Mo alloying are studied. The results show that the Al<sub>0.3</sub>CrFeNiCu<sub>1.5</sub> alloy is composed of FCC + BCC solid solution. When Mo element increases, σ phase is gradually appeared near the main peak of (111)<sub>FCC</sub>. The atomic size of Mo element is large, which is easy to cause lattice distortion. The diffraction peaks of (111)<sub>FCC</sub> and (110)<sub>BCC</sub> are separated. The Al<sub>0.3</sub>CrFeNiCu<sub>1.5</sub>Mo<sub>x</sub> alloys are composed of typical dendrites. The fracture toughness test shows that the value decreases continuously at 25&#xa0;°C; the value increases first and then decreases at 200&#xa0;°C (Mo-01 alloy average value is 73.291&#xa0;MPa·m<sup>1/2</sup>) and 300&#xa0;°C (Mo-01 alloy value is 49.260&#xa0;MPa·m<sup>1/2</sup>); the fracture toughness value first remains unchanged and then decreases at 400&#xa0;°C. The addition of Mo element plays a strengthening role, the secondary dendrite wall is obviously thickened. The crack propagation path is long, and the crack deflection is obvious. Most of the dendrites have a certain angle with the crack propagation direction, which hinders the crack propagation.</p>

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Microstructure Evolution and High-Temperature Fracture Toughness of Al0.3CrFeNiCu1.5Mox (x = 0,0.1,0.2,0.3) High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Rongyi Na,
  • Shulin Dong,
  • Yingdong Qu,
  • Ruirun Chen,
  • Guanglong Li,
  • Wei Zhang,
  • Siruo Zhang,
  • Weikai Kang

摘要

In order to enhance the high-temperature fracture toughness of high-entropy alloy, the phase composition, microstructure evolution, fracture toughness and crack propagation behavior of Al0.3CrFeNiCu1.5Mox alloy with Mo alloying are studied. The results show that the Al0.3CrFeNiCu1.5 alloy is composed of FCC + BCC solid solution. When Mo element increases, σ phase is gradually appeared near the main peak of (111)FCC. The atomic size of Mo element is large, which is easy to cause lattice distortion. The diffraction peaks of (111)FCC and (110)BCC are separated. The Al0.3CrFeNiCu1.5Mox alloys are composed of typical dendrites. The fracture toughness test shows that the value decreases continuously at 25 °C; the value increases first and then decreases at 200 °C (Mo-01 alloy average value is 73.291 MPa·m1/2) and 300 °C (Mo-01 alloy value is 49.260 MPa·m1/2); the fracture toughness value first remains unchanged and then decreases at 400 °C. The addition of Mo element plays a strengthening role, the secondary dendrite wall is obviously thickened. The crack propagation path is long, and the crack deflection is obvious. Most of the dendrites have a certain angle with the crack propagation direction, which hinders the crack propagation.