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Diffusion of Au in the Intermetallic Compound Ti3Al

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Abstract

The Au diffusion in the Ti3Al compound was investigated at six compositions from 25 to 35 at. pct Al by using the diffusion couples (Ti-X at. pct Al/Ti-X at. pct Al-2 at. pct Au; X = 25, 27, 29, 31, 32, and 35) at 1273 to 1423 K. The diffusion coefficients of Au in Ti3Al \( \left( {D_{\text{Au}}^{{{\text{Ti}}_{3} {\text{Al}}}} } \right) \) are relatively close to those of Ti. The \( {D}_{\text{Au}}^{{{\text{Ti}}_{3} {\text{Al}}}} {\text{s}} \) slightly increase with Al concentration within the same order of magnitude. The activation energies of Au diffusion, \( Q_{\text{Au}}^{{{\text{Ti}}_{3} {\text{Al}}}} {\text{s}}, \) evaluated from the Arrhenius plots were relatively close to those of Ti diffusion, \( Q_{\text{Ti}}^{{{\text{Ti}}_{3} {\text{Al}}}} {\text{s}}, \) rather than those of Al diffusion, \( {Q}_{\text{Al}}^{{{\text{Ti}}_{3} {\text{Al}}}} {\text{s}}; \) therefore, it was suggested that Au atoms diffuse by the sublattice diffusion mechanism in which Au atoms substitute for Ti sites preferentially in Ti3Al and diffuse by vacancy mechanism on Ti sublattice. The influence of the D019 ordered structure (hcp base) of Ti3Al on diffusion of Au and other elements is discussed by comparing the diffusivities in Ti3Al and α-Ti.

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Acknowledgment

This research was partly supported by the Grant-in-Aid for Scientific Research Program of the Japan Society for the Promotion of Science (No. 14702051).

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Authors and Affiliations

  1. Department of Adaptive Machine Systems, Osaka University, Osaka, 565-0871, Japan

    Y. Koizumi (Assistant Professor) & Y. Minamino (Professor)

  2. Hitachi Limited, Tokyo, 100-8280, Japan

    T. Tanaka

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  1. Y. Koizumi
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  2. T. Tanaka
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  3. Y. Minamino
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Correspondence to Y. Koizumi.

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Manuscript submitted January 8, 2009.

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Koizumi, Y., Tanaka, T. & Minamino, Y. Diffusion of Au in the Intermetallic Compound Ti3Al. Metall Mater Trans A 40, 2919–2926 (2009). https://doi.org/10.1007/s11661-009-0011-2

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