π-phase and ᵡ-phase: New precipitates in biomedical Co-Cr-Mo alloys

Takayuki Narushima, Shingo Mineta, Alfirano, Kyosuke Ueda

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)

Abstract

The phases of precipitates in ASTM F 75 and F 799 Co-Cr-Mo alloys are reviewed with a focus on new precipitates of the π- and ᵡ-phases. The π-phase carbide was observed at temperatures of 1,548-1,623 K where partial melting in Co-Cr-Mo-C system alloys occurred. Si was slightly enriched in the π-phase precipitate and nitrogen substituted carbon in the octahedral sites of the π-phase. It is suggested that the formation and stability in the partial melting region and the transformation of the π-phase take part in the final constitution of the precipitates in ASTM F 75 and F 799 alloys. A ᵡ-phase has been detected in the as-cast and heat- treated Co-Cr-Mo alloy with a midlevel carbon content and the addition of Si. The ᵡ-phase precipitate is an intermetallic compound. The conditions under which the ᵡ-phase is formed are limited by the heat-treatment temperature and chemical composition.

Original languageEnglish
Title of host publicationInterface Oral Health Science 2011
PublisherSpringer Japan
Pages72-80
Number of pages9
ISBN (Electronic)9784431540700
ISBN (Print)9784431540694
DOIs
Publication statusPublished - 2012 Jan 1

Keywords

  • ASTM F 75
  • Co-Cr alloy
  • Precipitation
  • π-Phase
  • ᵡ-Phase

ASJC Scopus subject areas

  • Dentistry(all)

Fingerprint Dive into the research topics of 'π-phase and ᵡ-phase: New precipitates in biomedical Co-Cr-Mo alloys'. Together they form a unique fingerprint.

Cite this