Phase transformations in the B2 phase of Co-rich Co-Al binary alloys

K. Niitsu, T. Omori, M. Nagasako, K. Oikawa, R. Kainuma, K. Ishida

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Phase transformations in the β (B2) phase of Co-21 and -23 at.% Al alloys were examined using transmission electron microscopy, energy dispersive X-ray spectroscopy and differential scanning calorimetry. The microstructures obtained from as-quenched specimens were found to be strongly affected by the quenching condition. While relatively thick sheet-specimens with a lower quenching rate showed bainitic plate precipitates with a fcc structure, a martensite-like structure was observed by optical microscopy in relatively thin specimens with a higher quenching rate. Regardless of the quenching condition, a spinodal-like microstructure composed of A2 and B2 phases was also detected and the A2 phase changed to a metastable hcp phase during further aging.

Original languageEnglish
Pages (from-to)2697-2702
Number of pages6
JournalJournal of Alloys and Compounds
Volume509
Issue number6
DOIs
Publication statusPublished - 2011 Feb 10

Keywords

  • Magnetic measurements
  • Metals
  • Scanning and transmission electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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