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Heterogeneous nucleation of σ′ on dislocations in a dilute aluminum-lithium alloy

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Abstract

The nucleation of S on dislocations with small undercooling in binary aluminum-lithium alloys has been examined. The study of related microstructures was performed using transmission electron microscopy (TEM), which demonstrates that σ′ preferentially nucleates on dislocations with a strong edge character and locates at the side where the stress field is compressive without destroying the dislocation core structure. This qualitatively justifies the theoretical prediction by Larché on coherent heterogeneous nucleation on edge dislocations. Following the evaluation of the volume free energy change for the binary system by the ideal solution model and the mean-field model by Khachaturyan, the nucleation barrier and the nucleation rate were calculated and compared with experimentally determined data based on Larché's model. Specifically, the back-calculated interfacial energies from the experimentally determined nucleation rate data are in good agreement with the interfacial energy temperature dependence predicted by the related interfacial energy model. The effects of misfit strain, volume diffusion, interfacial energy, and nucleation sites are discussed.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Virginia, USA

    Z. M. Wang (Postdoctoral Fellow)

  2. Department of Materials Science and Engineering, University of Virginia, 22903, Charlottesville, VA

    G. J. Shiflet (William G. Reynolds Professor)

Authors
  1. Z. M. Wang
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  2. G. J. Shiflet
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Additional information

Formerly Graduate Student

This article is based on a presentation made during TMS/ASM Materials Week in the symposium entitled “Atomistic Mechanisms of Nucleation and Growth in Solids,” organized in honor of H.I. Aaronson’s 70th Anniversary and given October 3–5. 1994 in Rosemont, Illinois.

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Wang, Z.M., Shiflet, G.J. Heterogeneous nucleation of σ′ on dislocations in a dilute aluminum-lithium alloy. Metall Mater Trans A 27, 1599–1609 (1996). https://doi.org/10.1007/BF02649818

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