Non-isothermal crystallization kinetics of Zr52Cu18Ni14Al10Ti6 metallic glass

作者：Prajapati Sonal R^*; Kasyap Supriya; Patel Ashmi T; Pratap Arun

来源：Journal of Thermal Analysis and Calorimetry, 2016, 124(1): 21-33.

DOI：10.1007/s10973-015-4979-0

• Crystallization kinetics
• DSC
• Secondary crystallization
• Isoconversional methods
• Isokinetic methods

In the present work, the thermal analysis of the bulk metallic glass with composition Zr52Cu18Ni14Al10Ti6 has been done by differential scanning calorimetry (DSC) through non-isothermal method. DSC curves indicate a two-step crystallization process at all four heating rates, i.e., 5, 10, 15, and 20 A degrees C min(-1). Non-isothermal crystallization studies of the alloy indicate that kinetics conform to Johnson-Mehl-Avrami (JMA) model. The master plot method and normalized heat flow curve prove the validity of JMA model. Analysis of the second crystallization event has been done by using various isoconversional and isokinetic methods available in the literature. Activation energy of crystallization increases, whereas the value of Avrami exponent decreases, with increase in crystallized fraction. The fitting curve using Lasocka's empirical relation shows that the influence of the heating rate for secondary crystallization event is larger than the primary crystallization event.

• 出版日期2016-4