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<p>The high-temperature creep behavior of the FCC + B2 eutectic high entropy alloy Fe<sub>28.2</sub>Ni<sub>18.8</sub>Mn<sub>32.9</sub>Al<sub>14.1</sub>Cr<sub>6</sub> was investigated using both strain-rate jump tests and constant-stress uniaxial creep experiments over temperatures ranging from 923 to 1023&#xa0;K and stresses from 27 to 70&#xa0;MPa. The alloy exhibited power law behavior with two distinct deformation regimes: a high strain-rate regime characterized by a stress exponent of ~ 6.4, indicating dislocation climb as the dominant mechanism, and a low strain-rate regime with an exponent near 2.7, suggesting a combination of dislocation glide and climb with possible solute drag effects. The measured activation volumes (35–105 b³, where <Emphasis Type="BoldItalic">b</Emphasis> is the Burgers vector) further support a diffusion- and dislocation-controlled creep mechanism. Dislocations were found mostly at the FCC/B2 interfaces. Fractographic analysis showed that most cracks are formed along the boundary between the B2 and FCC phases and propagate within the FCC phase after a long creep time.</p>

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Elevated Temperature Creep of a Eutectic FeNiMnAlCr High Entropy Alloy

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Edwin S. Jiang,
  • Jifeng Liu,
  • Ian Baker

摘要

The high-temperature creep behavior of the FCC + B2 eutectic high entropy alloy Fe28.2Ni18.8Mn32.9Al14.1Cr6 was investigated using both strain-rate jump tests and constant-stress uniaxial creep experiments over temperatures ranging from 923 to 1023 K and stresses from 27 to 70 MPa. The alloy exhibited power law behavior with two distinct deformation regimes: a high strain-rate regime characterized by a stress exponent of ~ 6.4, indicating dislocation climb as the dominant mechanism, and a low strain-rate regime with an exponent near 2.7, suggesting a combination of dislocation glide and climb with possible solute drag effects. The measured activation volumes (35–105 b³, where b is the Burgers vector) further support a diffusion- and dislocation-controlled creep mechanism. Dislocations were found mostly at the FCC/B2 interfaces. Fractographic analysis showed that most cracks are formed along the boundary between the B2 and FCC phases and propagate within the FCC phase after a long creep time.