High Entropy Alloys: Criteria for Stable Structure

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 49; no. 1; pp. 7 - 17
• Main Authors: Tripathy, Snehashish, Gupta, Gaurav, Chowdhury, Sandip Ghosh
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.01.2018; Springer Nature B.V
• Subjects: Atomic structure; Characterization and Evaluation of Materials; Chemistry and Materials Science; Communication; Crystal structure; Electronegativity; High entropy alloys; Materials Science; Metallic Materials; Metallurgy; Nanotechnology; Parameter modification; Structural Materials; Surfaces and Interfaces; Thin Films
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-017-4388-z

An effort has been made to reassess the phase predicting capability of various thermodynamic and topological parameters across a wide range of HEA systems. These parameters are valence electron concentration, atomic mismatch ( δ ), electronegativity difference (Δ χ ), mixing entropy (Δ S mix ), entropy of fusion (Δ S f ), and mismatch entropy ( S σ ). In continuation of that, two new parameters (a) Modified Darken–Gurry parameter ( A   =   Sσ * χ ) and (b) Modified Mismatch Entropy parameter ( B   =   δ* Sσ ) have been designed to predict the stable crystal structure that would form in the HEA systems considered for assessment.