Coarsening behavior of secondary phase particles in Zr-Sn-Nb-Fe alloy

doi:10.13251/j.issn.0254-6051.2020.06.020

Abstract

Abstract: The microstructure of Zr-0.3Sn-1.2Nb-0.2Fe alloy and Zr-0.5Sn-0.2Nb-0.8Fe alloy fuel cladding tubes annealed at different temperatures (450-550 ℃) were studied by means of SEM-SE and quantitative metallography analysis technique. The results show that increasing the temperature can promote the distribution uniformity and size coarsening process of the secondary phase particles. According to the second-order kinetics of Kahlweit theory, the secondary phase particle coarsening activation energy of the Zr-0.3Sn-1.2Nb-0.2Fe alloy and the Zr-0.5Sn-0.2Nb-0.8Fe alloy tubes are proven to be 209 kJ/mol and 179 kJ/mol respectively. The addition of Nb is considered to play an important role in increasing the coarsening activation energy of secondary phase particle.

Key words: zirconium alloy, final annealing, microstructure, secondary phase particles

CLC Number:

TG142.1

Wu Zongpei, Yang Zhongbo, Yi Wei. Coarsening behavior of secondary phase particles in Zr-Sn-Nb-Fe alloy[J]. Heat Treatment of Metals, 2020, 45(6): 89-92.

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