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      Ripening of L1 2 Ni 3Ti precipitates in the framework of the trans-interface diffusion-controlled theory of particle coarsening

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          Abstract

          Data are presented on the kinetics of coarsening of γ′-type Ni 3Ti precipitates (L1 2 crystal structure) in three binary Ni–Ti alloys containing 10.31, 11.84, and 13.72at.% Ti aged at 720°C for times up to 64 h. Data on the distributions of particle sizes (PSDs) are also presented. These data, as well as previously published data, are analyzed in light of a new theory of coarsening in which diffusion is controlled by transport through the non-sharp interface between the matrix and precipitate phases. The new theory, called the trans-interface diffusion-controlled (TIDC) theory of coarsening, predicts time (t)-dependent behavior of the type 〈r〉 n ∝ t for the growth of precipitates of average radius 〈r〉 and X Ti ∝ t −1/n for the depletion of the solute concentration of the matrix, X Ti. The exponent n is intimately related to the width of the interface between the precipitate and matrix phases, δ, which is assumed to depend on the particle radius as δ ∝ m, where n = m + 2. The shape of the scaled distribution of particle sizes (PSD) depends on n and the thermo-physical kinetic constants are independent of volume fraction. The data on kinetics are evaluated and compared for n=2.375, determined from analyses of the PSDs, and for n=3, which is the traditionally accepted value. The agreement between the data on kinetics and predictions of the TIDC theory is acceptable, and the TIDC theory is the only one capable of explaining the experimentally observed absence of an effect of volume fraction on the kinetics at larger volume fractions, and the shapes of the PSDs.

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          Decomposition kinetics in Ni-Ti alloys

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            Author and article information

            Journal
            meku
            Zeitschrift für Metallkunde
            Carl Hanser Verlag
            0044-3093
            2195-8556
            2006
            : 97
            : 3
            : 295-302
            Affiliations
            a Department of Materials Science and Engineering, University of California, Los Angeles, USA
            b depSamsung Informations Systems America, Inc., San Jose, USA
            Author notes
            [* ] Correspondence address, Dr. Alan J. Ardell, Department of Materials Science and Engineering, 6531-G Boelter Hall, University of California at Los Angeles, Los Angeles/CA, 90095-1595, Tel.: +1310825-7011, Fax: +1310206-7353. E-mail: aardell@ 123456ucla.edu

            Dedicated to Professor Dr. Gernot Kostorz on the occasion of his 65th birthday

            Article
            MK101254
            10.3139/146.101254
            © 2006, Carl Hanser Verlag, München
            Page count
            References: 41, Pages: 8
            Product
            Categories
            Basic

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