A New Kinetics-Based Approach to Quantifying the Extent of Metastable?→?Stable Phase Transformation in Thermally-Grown Al2O3 Scales

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• 作者：Wei Zhao (1)
  Zhuoqun Li (1)
  Brian Gleeson (1)
  
• 关键词：Alumina scale ; Phase transformation ; Instantaneous growth rate ; instantaneous time exponent ; Kinetics ; Thermogravimetric ; Theta alumina ; Alpha alumina ; Curve fitting
• 刊名：Oxidation of Metals
• 出版年：2013
• 出版时间：4 - April 2013
• 年：2013
• 卷：79
• 期：3
• 页码：361-381
• 全文大小：1399KB
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• 作者单位：Wei Zhao (1)
  Zhuoqun Li (1)
  Brian Gleeson (1)
  
  1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, 15261, USA
  
• ISSN：1573-4889

文摘

A novel kinetics analysis method to quantifying the extent of metastable?→?stable Al2O3 phase-transformation in thermally-grown alumina scales is presented. This analysis involved assessing thermogravimetric data and the time dependence of the associated value of the instantaneous time exponent, n i . It was found that if there is θ?→?οtransformation, the n i -value curve characteristically decreases to a minimum and then increases. The time corresponding to the minimum was defined as a transition time, t tr . It was found that after this t tr , the α phase was significantly established as a continuous layer and the overall scaling kinetics were greatly reduced. Furthermore, using a kinetics scenario for the θ and α co-formation, measured weight-gain kinetics could be well simulated from the initial co-formation stage to the steady-state single-α-phase-growing stage. Finally, it is shown that the transformation kinetics in the lateral direction can also be determined by this kinetics analysis method.