Interdiffusion‐Driven Phase Growth in Cr 26 Co 20 Fe 20 Mn 20 Ni 14 /Al High‐Entropy Alloy Diffusion Couple
Source abstract
Abstract
This study examined the nucleation and kinetics of phases progressed during the interdiffusion couple annealing of an extremely low stacking fault energy (SFE) Cr 26 Co 20 Fe 20 Mn 20 Ni 14 high‐entropy alloy (HEA) interfaced with pure Al at 600°C, up to 240 h. Microstructural analysis revealed two primary phases (indicated as P1 and P3) at all annealing intervals and region P2, which was a mixture of P1 and P3. The characterizations confirmed the phases P1 and P3 to be Al 9 (Co, Cr, Ni, Mn, Fe) 2 and Al 5 (Co, Cr, Ni, Mn, Fe) 2 , respectively. A transition zone with segregated phases P4 (Co, Ni‐rich) and P5 (Cr, Fe, Mn‐rich) was observed close to the HEA interface. Thermodynamic phase formation tendencies were further validated through CALPHAD (Calculation of Phase Diagram)‐analyses. Phase growth across the interdiffusion zone attains parabolic law with a rate constant ( K p ) of 1.35 × 10 −14 m 2 /s. The results indicated that the formation of intermetallic phases was primarily driven by enthalpy considerations. However, the existence of multiple elements in the sublattices delineated that entropy stabilization also played a significant role in the phase formation.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: High Entropy Alloys Studies · High Temperature Alloys and Creep · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Science and Metallurgical Engineering Indian Institute of Technology Hyderabad Sangareddy India
Centre for Interdisciplinary Programs Indian Institute of Technology Hyderabad Sangareddy India
Institute for Frontier Materials Deakin University Geelong Australia
School of Engineering Sciences and Technology University of Hyderabad Hyderabad India
International Advanced research Centre for Powder Metallurgy and New Materials (ARCI) Hyderabad India
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