Phase Selection in Solidification of Undercooled Co-B Alloys

doi:10.1016/j.jmst.2016.09.012

J. Mater. Sci. Technol.

2017, Vol. 33

Issue (4): 352-358 DOI: 10.1016/j.jmst.2016.09.012

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Phase Selection in Solidification of Undercooled Co-B Alloys

Wei X.X.¹, Xu W.², Kang J.L.¹, Ferry M.², Li J.F.^1,^*(

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¹ State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
² Australian Research Council Centre of Excellence for Design in Light Metals, School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia

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Abstract

A series Co-(18.5-20.7) at.% B melts encompassing the eutectic composition (Co_81.5B_18.5) were solidified at different degrees of undercooling. It is found that the metastable Co₂₃B₆ phase solidifies as a substitute for the stable Co₃B phase in the alloy melts undercooled above a critical undercooling value of ~60 K. The Co₂₃B₆ and α-Co phases make up a metastable eutectic. The corresponding eutectic composition and temperature are Co_80.4B_19.6 and 1343 K, respectively. On exposure of the metastable Co₂₃B₆ phase at a given temperature above 1208 K, it does not decompose even after several hours. But it transforms by a eutectoid reaction to α-Co + Co₃B at lower temperature.

Key words: Undercooling Rapid solidification Metastable phase diagram Structure evolution

Received: 13 December 2015 Published: 24 May 2017

Corresponding Authors: Li J.F. E-mail: jfli@sjtu.edu.cn

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Cite this article:

Wei X.X., Xu W., Kang J.L., Ferry M., Li J.F.. Phase Selection in Solidification of Undercooled Co-B Alloys. J. Mater. Sci. Technol., 2017, 33(4): 352-358.

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http://www.jmst.org/EN/10.1016/j.jmst.2016.09.012 OR http://www.jmst.org/EN/Y2017/V33/I4/352

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 Co_81.5B_18.5 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 (T_e is the equilibrium eutectic temperature and T_me the metastable eutectic temperature).

Fig. 3. Microstructures of the bulk Co_80.4B_19.6 alloy solidified at an undercooling of (a) 20 K and (b) 68 K, and (c) their corresponding XRD patterns and (d) cooling curves (T_l is the equilibrium liquidus temperature, T_e the equilibrium eutectic temperature and T_me the metastable eutectic temperature).

Fig. 4. Microstructures of the bulk Co_79.3B_20.7 (Co₂₃B₆) alloy solidified at an undercooling of (a) 17 K and (b) 70 K, and (c) their corresponding XRD patterns and (d) cooling curves (T_l is the liquidus temperature, T_e the equilibrium eutectic temperature and T_ml the melting temperature of metastable Co₂₃B₆ phase).

Fig. 5. (a) DSC curves of the Co_81.5B_18.5, Co_80.4B_19.6 and Co_79.3B_20.7 alloys consisting fully of metastable Co₂₃B₆ phase at a heating rate of 20 K/min, (b) DSC curves of the Co_79.3B_20.7 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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