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 journalArticlepeer-review

11 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2011 Feb 10


  • Magnetic measurements
  • Metals
  • Scanning and transmission electron microscopy


Dive into the research topics of 'Phase transformations in the B2 phase of Co-rich Co-Al binary alloys'. Together they form a unique fingerprint.

Cite this