Elastic anisotropy of iron carbides with trigonal-prismatic coordination of C by Fe

A. Leineweber, S. L. Shang, Z. K. Liu

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Elastic anisotropies obtained by density functional theory (DFT) calculations of four iron carbides exhibiting trigonal prismatic coordination of C by Fe are presented and compared. The elastic anisotropy is considerable for the carbides θ-Fe3C, χ-Fe5C2 and a hypothetical Fe2C with Pbcm symmetry, all with sheetlike arrangement of the trigonal prisms which results in a largely parallel arrangement of the prism axes. It is found that the easy shear which is mainly responsible for the large elastic anisotropy in these carbides occurs in all these three carbides in a plane perpendicular to the average axis of the prisms. In contrast to these three elastically anisotropic carbides, Fe7C3, in which the axes of the trigonal prisms are much more regularly distributed in space, shows a negligible elastic anisotropy.

Original languageEnglish (US)
Pages (from-to)390-394
Number of pages5
JournalJournal of Alloys and Compounds
Volume633
DOIs
StatePublished - May 15 2015

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Elastic anisotropy of iron carbides with trigonal-prismatic coordination of C by Fe'. Together they form a unique fingerprint.

  • Cite this