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<p>In this research, the creep behavior of cast and homogenized AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr refractory high entropy alloy was investigated through stress relaxation tests in the temperature range of 760–840&#xa0;°C (0.3–0.5 T<sub>m</sub>) with the prestrains of 0.07, 0.08, and 0.09. Microstructural characterizations by scanning electron microscope and X-ray diffraction showed that the microstructure of the homogenized alloy consists of dendritic and interdendritic phases, with BCC and HCP structures, respectively. It was found that the dendritic phase is rich in Ta and Mo, which were solidified at the early stages of casting and the interdendritic phase is enriched with Al and Zr to form the Al-Zr intermetallic compound. The creep tests revealed that the creep strain rises with an increase in temperature or applied constant stress. Trying various regression models showed that power law equations can accurately predict the creep behavior of material at all studied creep conditions. The material constants in the power law equation were then related to the creep temperature and the applied stress.</p>

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Investigating Microstructure and Creep Behavior of AlMo0.5NbTa0.5TiZr Refractory High-Entropy Alloy Using Stress Relaxation Test

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Mehdi Soltanalinezhad,
  • A. Farzadi,
  • Hamid Omidvar

摘要

In this research, the creep behavior of cast and homogenized AlMo0.5NbTa0.5TiZr refractory high entropy alloy was investigated through stress relaxation tests in the temperature range of 760–840 °C (0.3–0.5 Tm) with the prestrains of 0.07, 0.08, and 0.09. Microstructural characterizations by scanning electron microscope and X-ray diffraction showed that the microstructure of the homogenized alloy consists of dendritic and interdendritic phases, with BCC and HCP structures, respectively. It was found that the dendritic phase is rich in Ta and Mo, which were solidified at the early stages of casting and the interdendritic phase is enriched with Al and Zr to form the Al-Zr intermetallic compound. The creep tests revealed that the creep strain rises with an increase in temperature or applied constant stress. Trying various regression models showed that power law equations can accurately predict the creep behavior of material at all studied creep conditions. The material constants in the power law equation were then related to the creep temperature and the applied stress.