Ductility enhancement by boron addition in Co-Al-W high-temperature alloys

Kazuya Shinagawa, Toshihiro Omori, Katsunari Oikawa, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

117 Citations (Scopus)

Abstract

The mechanical properties of several B-free and B-doped Co-Al-W superalloys with different volume fractions of the Co3(Al,W)-γ′ phase were examined by mechanical tests at various temperatures up to 980 °C. Although grain boundary fracture occurred in the B-free alloys, the addition of a small amount of B drastically improved the ductility. It was also confirmed that the positive temperature dependence of strength was strongly affected not only by the volume fraction of the γ′ phase, but also by the addition of B.

Original languageEnglish
Pages (from-to)612-615
Number of pages4
JournalScripta Materialia
Volume61
Issue number6
DOIs
Publication statusPublished - 2009 Sep 1

Keywords

  • Co-based superalloys
  • Compression test
  • Grain boundary cohesion
  • Intermetallic compounds
  • Tension test

ASJC Scopus subject areas

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

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