Kinetic demixing and decomposition of multicomponent oxides due to a nonhydrostatic stress

D. Dimos, J. Wolfenstine, D. L. Kohlstedt

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Kinetic demixing of a solid solution oxide should occur during deformation if the cations have different mobilities and if the rate of stress-directed diffusion is not limited by oxygen diffusion. A theoretical treatment of kinetic demixing in mixed oxides due to a nonhydrostatic stress has been developed. Both the magnitude of the steady-state composition difference and the time constant which characterizes the transient behavior have been determined. Kinetic decomposition of a stoichiometric, ternary oxide can occur when the transport rates of the constituent oxides are different, provided that the magnitude of the driving force exceeds a certain limit. The critical differential stress for kinetic decomposition is a function of the free energy of formation of the compound and the transport coefficients of the species. The growth rate of the constituent oxide phase has also been evaluated.

Original languageEnglish (US)
Pages (from-to)1543-1552
Number of pages10
JournalActa Metallurgica
Issue number6
StatePublished - Jun 1988

Bibliographical note

Funding Information:
Acknowledgemenfs-Theauthorsare deeply indebted to ProfessoHrermannSchmalzriefodr introducingthemtothe (75) topicof kineticdemixinganddecompositionandfor numer-ous stimulatingdiscussionson the subject.Discussionswith G. Brian StephensonandMervyn S. Patersonwerealsovery helpful. Support from the National Science Foundation through Grants. No. DMR-8100131,DMR-8500480.and INT-8504802is gratefullyrecognized.


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