High-purity amorphous Zr52.5Cu17.9Ni14.6Al10Ti5 powders via mechanical amorphization of crystalline pre-alloys

Fully amorphous Zr52.5Cu17.9Ni14.6Al10Ti5 (Vit 105) powder with very low oxygen contamination was successfully produced from pre-alloyed crystalline material. A yield of over 80% was achieved without the use of a milling agent. The amorphization process was observed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The extremely fast amorphization rate was fitted by an exponential relaxation function. A partial time-temperature-transformation (TTT) diagram was obtained from isothermal annealing experiments based on the Johnson–Mehl–Avrami (JMA) model. In addition, the microstructure of the powder was observed by scanning electron microscopy (SEM), and gas analysis was conducted at various stages of the ball-milling process.