Kinetics study on non-isothermal crystallization of Cu50Zr50 metallic glass

In this paper, the crystallization kinetics of melt-spun Cu50Zr50 amorphous alloy ribbons has been investigated using differential scanning calorimetry. Moreover, the Kissinger, Ozawa and isoconversional approaches have been used to obtain the crystallization kinetic parameters. As shown in the results, the onset crystallization activation energy Ex is less than crystallization peak activation energy E-p. The local activation energy E-alpha increases at the crystallized volume fraction alpha < 0.2 and decreases at the rest, which suggests that crystallization process is increasingly hard (alpha < 0.2) at first, after which it become increasingly easy (alpha < 0.2). The nucleation activation energy E-nucleation is greater than grain growth activation energy E-growth, indicating that the nucleation is harder than growth. In terms of the local Avrami exponent n(alpha), it lies between 1.27 and 8, which means that crystallization mechanism in the non-isothermal crystallization is interface-controlled one- two- or three-dimensional growth with different nucleation rates.