Synthesis and magnetic properties of Cu-based amorphous alloys made by mechanical alloying

Advanced Cu-based amorphous powders are synthesized by mechanical alloying with different milling time and weight ratios of ball to powder and examined by X-ray diffraction, scanning electron microscope and transmission electron microscope. Magnetic hysteresis loops at room temperature are measured by a vibration sample magnetometer. According to the present experiment, Cu-based amorphous powders are synthesized after being milled for 8, 10, and 12.5 h, respectively. If the time is more than 12.5 h, amorphous phase will transform into crystalline one again; otherwise, if less than 8 h, amorphous phase cannot be formed completely. Cu-based amorphous powders show hard magnetic properties. In addition, their hard magnetic properties are lower than Nd-based amorphous alloys.