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<p>Body-centered cubic (bcc) refractory multi-principal element alloys (RMEA) are promising candidates for high-temperature applications due to their high strength in a wide temperature range. However, deformation at high temperatures may lead to dynamic recrystallization (DRX), which changes the internal microstructure and may affect the mechanical performance of the alloy. In this work, we use hot forging to induce partial dynamic recrystallization and to study its effect on the microstructure and hardness of the single-phase bcc NbMoTaW RMEA. After hot forging, we find a bimodal grain size distribution with initial coarse and fine recrystallized grains of 130 ± 60 and 28 ± 17&#xa0;µm, respectively. A significant ‘bulging’ on initial grain boundaries, which is known to be a precursor of DRX has identified. Indeed, softening of the deformed microstructure is captured using in situ SEM nanoindentation tests at room temperature, verifying that DRX may be occurring in the microstructure during hot deformation by forging.</p>

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Microstructural and mechanical characterization of the NbMoTaW refractory multi-principal element alloy after hot forging

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Marta Pozuelo,
  • Alberico Talignani,
  • Matthew Mecklenburg,
  • Y. Morris Wang,
  • Jaime Marian

摘要

Body-centered cubic (bcc) refractory multi-principal element alloys (RMEA) are promising candidates for high-temperature applications due to their high strength in a wide temperature range. However, deformation at high temperatures may lead to dynamic recrystallization (DRX), which changes the internal microstructure and may affect the mechanical performance of the alloy. In this work, we use hot forging to induce partial dynamic recrystallization and to study its effect on the microstructure and hardness of the single-phase bcc NbMoTaW RMEA. After hot forging, we find a bimodal grain size distribution with initial coarse and fine recrystallized grains of 130 ± 60 and 28 ± 17 µm, respectively. A significant ‘bulging’ on initial grain boundaries, which is known to be a precursor of DRX has identified. Indeed, softening of the deformed microstructure is captured using in situ SEM nanoindentation tests at room temperature, verifying that DRX may be occurring in the microstructure during hot deformation by forging.