Study on the Deformation Mechanism of a Nonequiatomic AlCrMnFeNi High-Entropy Alloy at Cold and Warm Temperatures

Abstract:

High-entropy alloys (HEAs) have led to breakthroughs in materials science due to their superior properties and the challenge of achieving the high strength and high ductility trade-off. Microstructural evolution during cold and warm compression tests of the single-phase Al₈Cr₁₂Mn₂₅Fe₃₅Ni₂₀ high entropy alloy (Fe-HEA) is investigated in the present work. The current study assesses the effect of temperature on the mechanical properties and deformation mechanism of the face-centered cubic structure Fe-HEA. The arc-melted ingot is homogenized at 1473 K and then directly hot-rolled to break the cast structure of the alloy prior to testing procedures. Fe-HEA is tested through uniaxial compressive testing at three different selected temperatures: 293, 473, and 673 K utilizing a Gleeble thermo-mechanical simulator at a strain rate of 0.001 s^-1. The compressive behavior at 673 K showed a higher strain hardening exponent when compared to 293 and 473 K. The deformed microstructural features of the compressed and quenched specimens, deformation mechanism, and phase revolution are investigated with X-ray diffraction (XRD) and electron backscattered diffraction (EBSD). Dislocation densities for the deformed conditions were estimated to be 4.11 × 10¹⁴ and 5.39 × 10¹⁴ m^-2 for the 473 and 673 K deformed conditions, respectively. At a deformation temperature of 673 K, B2 precipitation is observed at the high-angle grain boundaries.

• Periodical: Solid State Phenomena (Volume 353)
• Pages: 19-24
• DOI: https://doi.org/10.4028/p-QwTrS0
• Online since: December 2023
• Authors: Ahmed W. Abdelghany*, Matias Jaskari, Atef Saad Hamada, Mohamed Abdel Hady Gepreel, Antti Järvenpää
• Keywords: AlCrMnNiFe, Deformation Mechanism, High-Entropy Alloy, Mechanical Properties, Warm Temperature Deformation

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