Preparation, thermal stability and magnetic properties of Fe–Co–Ni–Zr–Mo–B bulk metallic glass

A new bulk metallic glass Fe56Co7Ni2Zr10Mo5B20 rod with a diameter of 1.5 mm was prepared by copper mould casting from industrial raw materials. The amorphous state and crystallization behaviour were investigated by X-ray diffraction. The thermal stability, such as the glass transition temperature (Tg), the onset temperature of crystallization (Tx), supercooled liquid region (ΔTx) between Tg and Tx, and reduced glass temperature Trg(Tg/Tm), the ratio of the glass transition temperature (Tg) and the onset temperature of melting (Tm) were measured by differential scanning calorimetry to be 868, 937, 69 K and 0.596, respectively. The crystallization products are determined to be α-Fe, ZrFe2, Fe3B, MoB2, and Mo2FeB2 and an unknown phase, as determined by X-ray analysis of the sample annealed for 1.5 ks at 973 K. This bulk metallic alloy exhibits ferromagnetic properties with saturation magnetization (Ms) of 41.6 emu/g, and low coercivity for the as-cast rod of 1.5 mm diameter.