Cr segregation at C11b/C40 interface in MoSi2-based alloys: A first-principles study

Koretaka Yuge, Kyosuke Kishida, Haruyuki Inui, Yuichiro Koizumi, Koji Hagihara, Takayoshi Nakano

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Based on the first-principles calculation, we investigated Cr segregation behavior at the C11b/C40 lamellar interface for MoSi 2-based alloys. We first elucidated the energetically stable interface structure among possible contacts between C11b and C40, where the interface energy is 1.7 meV/Å2. Without inclusion of lattice vibrational contribution to segregation energy, Cr composition at the interface was lower than that at C40 phase, which was inconsistent with the early experimental result. Inclusion of the vibrational contribution successfully resulted in strong Cr segregation at the interface over that at C11b as well as C40 phase. This indicates that Cr segregation at the most stable interface is a thermodynamically stable state, in which lattice vibration plays a significant role.

Original languageEnglish
Pages (from-to)165-169
Number of pages5
JournalIntermetallics
Volume42
DOIs
Publication statusPublished - 2013

Keywords

  • A. Silicides, various
  • B. Thermodynamic and thermochemical properties
  • D. Phase interfaces
  • E. Ab-initio calculations

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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