The effects of boron addition on the microstructure and mechanical properties of Co-Re-based high-temperature alloys

D. Mukherji, J. Rösler, M. Krüger, M. Heilmaier, M. C. Bölitz, R. Völkl, U. Glatzel, L. Szentmiklósi

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

High-melting-point Co-Re-base alloys show promise as a new class of high-temperature material. However, polycrystalline alloys fracture intergranularly. The addition of boron changes the fracture mode and dramatically improves the strength and ductility. Cr2B-type borides form at grain boundaries even with 200 ppm B addition in a Co-17Re-23Cr alloy. Borides are not, however, present at all grain boundaries, and electron energy loss spectroscopy could not detect elemental B segregation at grain boundaries. Measurements of boron mapping by neutron-induced radiography indicates that segregation of B to grain boundaries occurs, though only in some Co-Re alloy compositions.

Original languageEnglish
Pages (from-to)60-63
Number of pages4
JournalScripta Materialia
Volume66
Issue number1
DOIs
Publication statusPublished - Jan 1 2012

Keywords

  • Bending test
  • Ductility
  • Grain boundary cohesion
  • Microscopy and microanalysis techniques
  • Prompt gamma activation analysis (PGAA)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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