Carbon stabilized A15 Cr 3Re precipitates and ductility enhancement of Cr-based alloys

N. I. Medvedeva, Yu N. Gornostyrev, Arthur J Freeman

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A new metastable A15 phase in the Cr-Re system is predicted based on full-potential linear muffin-tin orbital (FLMTO) calculations of its electronic structure and cohesive properties. While A15 Cr 3Re is unstable as a bulk compound, we demonstrate that nonstoichiometry and carbon impurities play a dominant role in stabilizing this phase and may lead to the occurrence of A 15 type particles in Cr-based alloys. Thus, these A15 precipitates may scavenge carbon impurities and prevent the formation of brittle carbides and, additionally, provide an obstacle for dislocation motion. The formation of small close-packed particles appear to explain the improvement of both ductility and strength and is most likely the mechanism of the "rhenium effect" in Cr (W, Mo) based alloys.

Original languageEnglish
Pages (from-to)2471-2476
Number of pages6
JournalActa Materialia
Volume50
Issue number10
DOIs
Publication statusPublished - Jun 12 2002

Keywords

  • Ab initio calculation
  • Chromium alloys
  • Mechanical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Metals and Alloys

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