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Segregation and wetting transition at dislocations

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Abstract

We investigate solute segregation and wetting transition at dislocations and the corresponding drag effect on dislocation glide using a continuum model developed previously for grain boundary and based on gradient thermodynamics. The dislocation core structure and stress field are described by the newly developed phase field model. This study differs from much previous work because it takes into account not only the long-range elastic interactions but the short-range chemical interactions between solute atoms and dislocation core as well as among solute atoms themselves. The latter leads to the prediction of a wetting transition at the dislocation core with respect to varying temperature, solute concentration, or dislocation velocity. The transition temperatures obtained during heating and cooling are different from each other, leading to a hysteresis loop in the solute concentration-temperature plot and the solute concentration-velocity plot. These predictions could provide new insights into the phenomena of sharp yield point drop and strain aging observed in metal alloys.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, 43210, Columbus, OH

    N. Ma (Postdoctoral Candidate), C. Shen (Postdoctoral Candidate), S. A. Dregia (Associate Professor) & Y. Wang (Associate Professor)

Authors
  1. N. Ma
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  2. C. Shen
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  3. S. A. Dregia
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  4. Y. Wang
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Additional information

This article is based on a presentation made in the “Hillert Symposium on Thermodynamics & Kinetics of Migrating Interfaces in Steels and Other Complex Alloys,” December 2–3, 2004, organized by The Royal Institute of Technology in Stockholm, Sweden.

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Ma, N., Shen, C., Dregia, S.A. et al. Segregation and wetting transition at dislocations. Metall Mater Trans A 37, 1773–1783 (2006). https://doi.org/10.1007/s11661-006-0119-6

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