A compound unit method for incorporating ordered compounds into lattice models of alloys

Arvind R. Kalidindi, Christopher A. Schuh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Lattice models can be a basic tool for alloy design, due to their ability to capture the most important thermodynamic and kinetic phenomena of a wide-range of alloys at a low computational cost. However, in order to correctly treat ordered precipitates at off-stoichiometric compositions requires multi-body potentials, and these can be challenging to calibrate to known alloy behaviors. Here we introduce a simple means of capturing the multi-body terms needed to treat ordered compounds in a lattice model based on defining "compound units". This approach is particularly designed for, and easily calibrated in, cases where the structure and formation energy of equilibrium compounds are already known. This is accomplished by defining a compound unit that derives its energy from the formation energy of the compound as an a priori input. The method is illustrated for a binary alloy with D03 and B2 stable compounds.

Original languageEnglish (US)
Pages (from-to)172-179
Number of pages8
JournalComputational Materials Science
Volume118
DOIs
StatePublished - Jun 1 2016

Keywords

  • Alloy
  • Intermetallic
  • Ising model
  • Monte Carlo
  • Ordered compound
  • Pairwise

ASJC Scopus subject areas

  • General Computer Science
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • General Physics and Astronomy
  • Computational Mathematics

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