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Thermal Stability of Precipitates in a Rapidly Quenched Ti-Al-Si Alloy

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Abstract

Ostwald ripening of precipitates in rapidly solidified Ti-5Al-2Si (wt.%) has been studied by TEM. Results show that particle coarsening at 700 and 800°C is controlled by volume diffusion. Diffusion coefficients of Si in α-Ti were found to be ∼7.5 × 10−13 cm2/sec at 700°C and ∼1.2 × 10−11 cm2/sec at 800°C. At these temperatures, microstructural refinement due to rapid quenching had no noticeable effect on the coarsening mechanism for the RS Ti-5Al-2Si alloy.

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Authors and Affiliations

  1. Materials Science Division, Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, Boston, MA, 02115, USA

    S. H. Whang, Y. Z. Lu & B. C. Giessen

Authors
  1. S. H. Whang
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  2. Y. Z. Lu
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  3. B. C. Giessen
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Contribution #192 from the Barnett Institute

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Whang, S.H., Lu, Y.Z. & Giessen, B.C. Thermal Stability of Precipitates in a Rapidly Quenched Ti-Al-Si Alloy. MRS Online Proceedings Library 28, 367–373 (1983). https://doi.org/10.1557/PROC-28-367

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