The Ostwald ripening behavior of Al8CeCu4 phase in Al-14Cu-7Ce alloy

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The Ostwald ripening behavior of Al8CeCu4 phase in Al-14Cu-7Ce alloy
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Affiliation:Changzhou University,School of Materials Science and Engineering, Changzhou University,School of Materials Science and Engineering, Changzhou University,School of Materials Science and Engineering, Changzhou University,School of Materials Science and Engineering, Central South University
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Abstract:

The Ostwald ripening behavior of Al8CeCu4 phase in the Al-14Cu-7Ce alloy annealing at elevated temperatures was investigated using hardness testing, scanning electron microscopy, image analyses and physical modeling. The average radius of Al8CeCu4 particles increases while the hardness of the alloy decreases with increasing annealing temperature and time. The ripening process of Al8CeCu4 phase is mainly controlled by the volume diffusion of Ce. The ripening kinetic of Al8CeCu4 particles satisfies well the modified Lifshits-Slyozov-Wagner theory, taking into account the effect of the volume fraction of Al8CeCu4 particles. The volume diffusion coefficient of Ce and the interfacial energy between the matrix and Al8CeCu4 phase are also calculated based on the general rate equation.

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[Li Hai, Wang Zhixiu, Fang Bijun, Song Renguo, Zheng Ziqiao. The Ostwald ripening behavior of Al8CeCu4 phase in Al-14Cu-7Ce alloy[J]. Rare Metal Materials and Engineering,2016,45(5):1106~1110.]
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Received:March 29,2014
Revised:January 15,2015
Adopted:February 06,2015
Online: June 02,2016
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