The effect of lattice stability determination on the computational phase diagrams of intermetallic alloys

Journal Article (Journal Article)

The evaluation of lattice stabilities of unstable elemental phases is a long-standing problem in the computational assessment of phase diagrams. Here we tackle this problem by explicitly calculating phase diagrams of intermetallic systems where its effect should be most conspicuous, binary systems of titanium with bcc transition metals. Two types of phase diagrams are constructed: one based on the lattice stabilities extracted from empirical data, and the other using the lattice stabilities computed from first principles. It is shown that the phase diagrams obtained using the empirical values contain clear contradictions with the experimental phase diagrams at the well known limits of low or high temperatures. Realistic phase diagrams, with a good agreement with the experimental observations, are achieved only when the computed lattice stability values are used. At intermediate temperatures, the computed phase diagrams resolve the controversy regarding the shape of the solvus in these systems, predicting a complex structure with a eutectoid transition and a miscibility gap between two bcc phases.

Full Text

Duke Authors

Cited Authors

  • Barzilai, S; Toher, C; Curtarolo, S; Levy, O

Published Date

  • January 1, 2017

Published In

Volume / Issue

  • 728 /

Start / End Page

  • 314 - 321

International Standard Serial Number (ISSN)

  • 0925-8388

Digital Object Identifier (DOI)

  • 10.1016/j.jallcom.2017.08.263

Citation Source

  • Scopus