Compressive deformation behavior of CrMnFeCoNi high-entropy alloy

• Published in: Metals and materials international Vol. 22; no. 6; pp. 982 - 986
• Main Authors: Jang, Min Ji, Joo, Soo-Hyun, Tsai, Che-Wei, Yeh, Jien-Wei, Kim, Hyoung Seop
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.11.2016; Springer Nature B.V; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Deformation; Dislocation density; Dislocations; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mathematical models; Metallic Materials; Processes; Solid Mechanics; Strain hardening; Surface layer; Synchrotrons; Texture; 재료공학; dislocation; metals; deformation; alloys; texture
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-016-6304-2

The compressive deformation behavior of a single phase CrMnFeCoNi high-entropy alloy (HEA) is investigated using experimental and theoretical approaches. The equiaxed microstructures are observed using optical microscope, electron backscattered diffraction, and synchrotron X-ray diffraction (XRD) techniques. Compressive results reveal that the CrMnFeCoNi HEA has a high strain-hardening exponent in spite of its large grain size due to increased dislocation density and severe lattice distortion. The compressive texture of the HEA resembles those of typical FCC metals. The phenomenological dislocation-based constitutive model well describes the compressive deformation behavior. The predicted dislocation density is in good quantitative agreement with the experimental value measured using whole-profile fitting of synchrotron XRD peaks. It can be confirmed from the experimental and theoretical findings that the deformation mechanism of the CrMnFeCoNi HEA is the conventional dislocation glide and mechanical twinning is negligible contrary to general belief.