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• W2078662893 abstract "This paper presents the results of combined experimental and theoretical studies of Ti and Al self-diffusion in the intermetallic compound γ-TiAl. Ti self-diffusion coefficients were measured over a temperature range of 1184–1691 K using the radiotracer 44Ti and the serial sectioning method. The diffusion coefficients show a non-Arrhenius behaviour with significant upward deviations at high temperatures (above ∼1470 K). The pre-exponential factor and the activation energy of Ti self-diffusion determined in the low temperature range (<1470 K) are (D∗Ti)0≈1.5×10−6 m2/s and Q∗Ti≈250 kJ/mol, respectively. By combining the obtained Ti self-diffusion coefficients with interdiffusion coefficients measured previously by Sprengel et al. (W. Sprengel, N. Opkawa, H. Nakajima, Intermetallics 4 (1996), 185) and using the Darken–Manning equation, Al self-diffusion coefficients in TiAl were evaluated. Within the scatter of the data points, Al self-diffusion follows the Arrhenius law with D∗Al0≈2.1×10−2 m2/s and Q∗Al≈360 kJ/mol. The energies of point defect formation and migration in TiAl were calculated by molecular statics with embedded-atom potentials. Several diffusion mechanisms in TiAl were considered, including migration of Ti and Al along their own sublattices by single vacancy jumps, 3-jump vacancy cycles and the anti-structural bridge mechanism. The activation energies of Ti and Al self-diffusion by different mechanisms were evaluated as functions of the alloy composition. The calculations predict that, in the compositions studied experimentally, Ti diffusion at low temperatures is dominated by the vacancy mechanism, while at higher temperatures the anti-structural bridge mechanism can essentially contribute to the overall diffusivity. Al diffusion occurs by the vacancy mechanism with some contribution of 3-jump cycles and anti-structural bridges. These predictions are in good agreement with the experimental results of this work." @default.
• W2078662893 created "2016-06-24" @default.
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• W2078662893 date "1999-03-01" @default.
• W2078662893 modified "2023-10-11" @default.
• W2078662893 title "Self-diffusion in γ-TiAl: an experimental study and atomistic calculations" @default.
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• W2078662893 doi "https://doi.org/10.1016/s0966-9795(98)00117-4" @default.
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