Microstructure and magnetic properties of nanocrystalline cobalt-zirconium boride alloy prepared by melt spinning and subsequent annealing
Abstract
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.
- Publication:
-
Applied Physics A: Materials Science & Processing
- Pub Date:
- August 2019
- DOI:
- 10.1007/s00339-019-2784-5
- Bibcode:
- 2019ApPhA.125..502M