J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (4): 352-358.DOI: 10.1016/j.jmst.2016.09.012
• Orginal Article • Previous Articles Next Articles
Wei X.X.1, Xu W.2, Kang J.L.1, Ferry M.2, Li J.F.1,*()
Received:
2015-12-13
Revised:
2016-01-25
Accepted:
2016-01-27
Online:
2017-04-15
Published:
2017-05-24
Contact:
Li J.F.
Wei X.X., Xu W., Kang J.L., Ferry M., Li J.F.. Phase Selection in Solidification of Undercooled Co-B Alloys[J]. J. Mater. Sci. Technol., 2017, 33(4): 352-358.
Fig. 1. Heating DSC curves of hypoeutectic, eutectic and hypereutectic alloy samples solidified at an undercooling below 5 K (heating rate = 20 K/min).
Fig. 2. Microstructures of the bulk Co81.5B18.5 eutectic alloy solidified at undercooling of (a) 5 K, (b) 55 K, (c) 65 K and (d) 75 K. (e) XRD patterns of 55 K and 65 K undercooled samples and (f) cooling curves of four samples (Te is the equilibrium eutectic temperature and Tme the metastable eutectic temperature).
Fig. 3. Microstructures of the bulk Co80.4B19.6 alloy solidified at an undercooling of (a) 20 K and (b) 68 K, and (c) their corresponding XRD patterns and (d) cooling curves (Tl is the equilibrium liquidus temperature, Te the equilibrium eutectic temperature and Tme the metastable eutectic temperature).
Fig. 4. Microstructures of the bulk Co79.3B20.7 (Co23B6) alloy solidified at an undercooling of (a) 17 K and (b) 70 K, and (c) their corresponding XRD patterns and (d) cooling curves (Tl is the liquidus temperature, Te the equilibrium eutectic temperature and Tml the melting temperature of metastable Co23B6 phase).
Fig. 5. (a) DSC curves of the Co81.5B18.5, Co80.4B19.6 and Co79.3B20.7 alloys consisting fully of metastable Co23B6 phase at a heating rate of 20 K/min, (b) DSC curves of the Co79.3B20.7 alloy consisting fully of metastable Co23B6 phase during isothermal annealing at various temperatures, (c) microstructure of the alloy isothermally annealed to the end of the decomposition and (d) the corresponding XRD patterns.
Fig. 6. Co-rich region of the Co-B phase diagram. The solid lines correspond to the equilibrium diagram[21], while the dashed lines show the estimated metastable phase diagram. The symbols denote the phase constitution of typical bulk alloy samples solidified at different undercoolings.
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