Influence of quenching rate on the crystallization behaviors of Mg63Ni22Pr15 metallic glass

The influence of the quenching rate (from 5 m/s to 40 m/s) on the crystallization behaviors of melt-spun Mg63Ni22Pr15 metallic glasses has been studied. The isochronal differential scanning calorimeter (DSC) measurement at 20 K/min shows that the transition temperatures increase with the quenching rate, while the parameters of the glass-forming ability keep constant. The kinetics of isothermal crystallization performed at 481 K within the supercooled liquid region is discussed with some nucleation and growth models. The fittings show that with decreasing quenching rate, the quenched-in nucleation becomes more important and even dominant in the crystallization process.