Phase stability of the sigma phase in Fe-Cr based alloys

Marcel H.F. Sluiter, Keivan Esfarjani, Yoshiyuki Kawazoe

研究成果: Conference article査読


The FeCr sigma phase is a good example of a complex structure: it has 30 atoms in the unit cell and 5 inequivalent lattice sites, and it belongs to the class of tetrahedrally close packed structures, also known as Frank-Kaspar structures. So far, such structures have not been treated within a first-principles statistical thermodynamics framework. It will be shown that due to advances in algorithms and hardware important features of the phase stability of complex phases can be computed. The factors which affect the stability of the sigma phase have been studied using carefully selected supercells for electronic total energy calculations. Cluster variation calculations in the tetrahedron approximation were performed to evaluate the effect of partial disorder and of finite temperature. The preferred occupancy of the 5 lattice sites has been investigated and is compared with experimental determinations.

ジャーナルMaterials Research Society Symposium - Proceedings
出版ステータスPublished - 1996 12月 1
イベントProceedings of the 1996 MRS Fall Symposium - Boston, MA, USA
継続期間: 1995 11月 271995 12月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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