Phase transformations in the B2 phase of Co-rich Co–Al binary alloys
Phase transformations in the B2 phase of Co-rich Co–Al binary alloys
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DOI：
10.1016/j.jallcom.2010.11.130
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发表时间：
2011-02
影响因子：
6.2
通讯作者：
K. Niitsu;T. Omori;M. Nagasako;K. Oikawa;R. Kainuma;K. Ishida
中科院分区：
文献类型：
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作者：
K. Niitsu;T. Omori;M. Nagasako;K. Oikawa;R. Kainuma;K. Ishida
使用透射电子显微镜、能量色散 X 射线光谱和差示扫描量热法检查了 Co-21 和 –23at.% 铝合金的 β (B2) 相的相变。发现从淬火样品获得的微观结构受到淬火条件的强烈影响。虽然具有较低淬火速率的相对较厚的板状试样显示出具有面心立方结构的贝氏体板状析出物，但通过光学显微镜在具有较高淬火速率的相对较薄的试样中观察到马氏体状结构。无论淬火条件如何，都检测到由 A2 和 B2 相组成的旋节线状微观结构，并且在进一步时效过程中 A2 相转变为亚稳态 hcp 相。
Phase transformations in the β (B2) phase of Co–21 and –23at.% 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.