Non-Isothermal Kinetics Analysis of α→β Transformation in Zirconium Alloy

Abstract:

Differential scanning calorimetry (DSC) was used to study non-isothermal kinetics of α→β transformation of Zr-0.5wt%Sn-0.15wt%Nb-0.5wt%Fe-0.25wt%V alloy. The DSC curves were measured from room temperature to 1030 °C at the heating rate of 15, 20, 30, 50°C /min respectively. The Flynn-Wall-Ozawa (FWO) method was used to get the activation energy (E) of α→β transformation at different conversion ratios. Then the values of activation energy obtained were modified by Ozawa iterative equation. The kinetic mechanism functions of α→β transformation were investigated by Criado-Ortega methods. The results show that the activation energy is related to conversion ratios. It means α→β transformation is not a simple one-step reaction but a complex multi-step reaction. The most probable kinetic mechanism functions are different in different temperature ranges, which are -ln(1-x) for ≤830 °C, [-ln(1-x)]^1/2 for 834~848 °C, [-ln(1-x)]^2/5for 850~856 °C and [-ln(1-x)]^1/3 for 858~868 °C respectively.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 344-350
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.344
• Online since: May 2020
• Authors: Zong Pei Wu*, Zhu Qing Cheng, Zhong Bo Yang, Wei Yi, Xiao Lu Xu
• Keywords: DSC, Non-Isothermal Kinetics, Phase Transition, Zr-Sn-Nb-Fe-V Alloy

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