Phase transformations in the B2 phase of Co-rich Co-Al binary alloys |
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Authors: | K. NiitsuT. Omori M. NagasakoK. Oikawa R. KainumaK. Ishida |
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Affiliation: | Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai 980-8579, Japan |
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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. |
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Keywords: | Metals Scanning and transmission electron microscopy Magnetic measurements |
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