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

29 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 2012

Fingerprint

Boron
heat resistant alloys
Superalloys
Grain boundaries
boron
grain boundaries
Boron Compounds
mechanical properties
Mechanical properties
microstructure
Microstructure
borides
Borides
refractory materials
Electron energy loss spectroscopy
Radiography
radiography
ductility
melting points
Melting point

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

Cite this

The effects of boron addition on the microstructure and mechanical properties of Co-Re-based high-temperature alloys. / Mukherji, D.; Rösler, J.; Krüger, M.; Heilmaier, M.; Bölitz, M. C.; Völkl, R.; Glatzel, U.; Szentmiklósi, L.

In: Scripta Materialia, Vol. 66, No. 1, 01.2012, p. 60-63.

Research output: Contribution to journalArticle

Mukherji, D. ; Rösler, J. ; Krüger, M. ; Heilmaier, M. ; Bölitz, M. C. ; Völkl, R. ; Glatzel, U. ; Szentmiklósi, L. / The effects of boron addition on the microstructure and mechanical properties of Co-Re-based high-temperature alloys. In: Scripta Materialia. 2012 ; Vol. 66, No. 1. pp. 60-63.
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