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

N. I. Medvedeva*, Yu N. Gornostyrev, A. J. Freeman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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 (US)
Pages (from-to)2471-2476
Number of pages6
JournalActa Materialia
Issue number10
StatePublished - Jun 12 2002


  • Ab initio calculation
  • Chromium alloys
  • Mechanical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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