Abstract

High-entropy (H-E) alloys, bulk metallic glasses (BMGs) and high-entropy BMGs (HE-BMGs) were statistically analyzed with the help of a database of ternary amorphous alloys. Thermodynamic quantities corresponding to heat of mixing and atomic size differences were calculated as a function of composition of the multicomponent alloys. Actual calculations were performed for configurational entropy (Sconfig.) in defining the H-E alloys and mismatch entropy (Sσ) normalized with Boltzmann constant (kB), together with mixing enthalpy (λHmix) based on Miedema's empirical model and Delta parameter (δ) as a corresponding parameter to Sσ/kB. The comparison between λHmix-δ and λHmix- √Sσ/kBdiagrams for the ternary amorphous alloys revealed Sσ/kB ̃ (δ /22)2. The zones S, S' and B's where H-E alloys with disordered solid solutions, ordered alloys and BMGs are plotted in the λHmix-δ diagram are correlated with the areas in the λHmix - Sσ/kB diagram. The results provide mutual understandings among H-E alloys, BMGs and HE-BMGs.

Original languageEnglish
Pages (from-to)3810-3821
Number of pages12
JournalEntropy
Volume15
Issue number9
DOIs
Publication statusPublished - 2013

Keywords

  • Alloy design
  • Atomic size difference
  • Bulk metallic glass
  • Configurational entropy
  • High-entropy alloy
  • Mismatch entropy
  • Mixing enthalpy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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