Mohammad Molaahmadi - Malek- Ashtar University of Technology
Majid Tavoosi - Malek-Ashtar University of Technology
Ali Ghasemi - Malek- Ashtar University of Technology
Gholam Reza Gordani - Malek- Ashtar University of Technology

Investigation the structural and magnetic properties of nanocrystalline Co۷۸Zr۱۷B۲Si۱W۲ alloy during melt spinning and annealing processes were the main goal of this study. In this regard, samples were prepared using vacuum induction melting, melt spinning and subsequent annealing. The specimens were evaluated using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). Based on results, nanocrystalline Co۵Zr single phase with hard magnetic properties (Ms=۲۹.۵ emu/g and Hc=۲.۷ kOe) successfully formed during melt spinning process (at wheel speed of ۴۰ m.s-۱). The coercivity value of rapid solidified sample increased to about ۳.۲ kOe during annealing process up to ۴۰۰°C. However, more increasing in annealing temperature lead to the transformation of non-equilibrium magnetic Co۵Zr phase to stable Zr۲Co۱۱ phase, which has distractive effects on final magnetic properties.

Co-Zr alloy, Nanocrystalline, Melt-spinning, Magnetic properties