Microstructure and magnetic properties of nanocrystalline cobalt–zirconium boride alloy prepared by melt spinning and subsequent annealing
The structural, thermal and magnetic characteristics of cobalt–zirconium boride (Co80Zr18B2) alloy were investigated in this work. In this regards, cobalt–zirconium boride samples with different structures and crystallite sizes were prepared using a copper boat vacuum induction melting plus melt-spinning and subsequent annealing processes. Prepared samples were characterized using X-ray diffraction, field emission scanning electron microscopy, differential scanning calorimetry and vibrating sample magnetometer. According to X-ray diffraction results, cobalt–-zirconium (Zr2Co11) single phase can successfully form by means of a melt-spinning process at a wheel speed of 40 m s−1. The saturation magnetization and coercivity of this sample are 58 emu/g and 3 kOe, respectively, which exhibit a hard magnetic property. Cobalt–zirconium compound which formed during melt-spinning process was not stable and transformed to Co23Zr6 during annealing process up to 500 °C. The maximum value of coercivity (Hc = 3.4 kOe vs. 3 kOe for single Zr2Co11 phase) is related to cobalt–zirconium boride alloy after annealing at 500 °C for 1 h.
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