Formation of Ni_(57)Zr_(20)Ti_(22)Pb_1 Amorphous Powders by Mechanical Alloying

摘要

In the current study, the amorphization behavior of mechanically alloyed Ni_(57)Zr_(20)Ti_(22)Pb_1 powder was examined in details. The conventional X-ray diffraction results confirm that the fully amorphous powders formed after 5 hours of milling. The thermal stability of the Ni_(57)Zr_(20)Ti_(22)Pb_1 amorphous powders was investigated by differential scanning calorimeter (DSC). As the results demonstrated, the glass transition temperature (T_g) and the crystallization temperature (T_x) are 760 K and 850 K, respectively. The supercooled liquid regionΔ T_x is 90 K.. The appearance of wide supercooled liquid region may be mainly due to the Pb additions which cause the increasing differences in atomic size of mechanically alloyed Ni_(57)Zr_(20)Ti_(22)Pb_1 powders.