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Reducing grain boundary, dislocation line and vacancy formation energies by solute segregation: II. Experimental evidence and consequences

✍ Scribed by Reiner Kirchheim

Book ID: 103998232
Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 348 KB
Volume: 55
Category: Article
ISSN: 1359-6454
DOI: 10.1016/j.actamat.2007.05.033

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✦ Synopsis

The extended version of the Gibbs adsorption isotherm including dislocations and vacancies is used to analyse existing experimental data. Thus phenomena and models like solid solution softening, hydrogen-enhanced local plasticity, brittleness of hydrides and superabundant vacancies could be interpreted on the basis of thermodynamics as caused by changing the defect energy by solute segregation; like in Gibbs' original work, surface and grain boundary energies are reduced by excess solute. In addition, the analysis of experimental results addresses the question whether zero or negative defect energies are feasible and how this will affect materials behaviour.

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Reducing grain boundary, dislocation line and vacancy formation energies by solute segregation. I. Theoretical background

✍ Reiner Kirchheim 📂 Article 📅 2007 🏛 Elsevier Science 🌐 English ⚖ 311 KB

The Gibbs adsorption isotherm and Wagner's definition of excess solute at surfaces and grain boundaries are both extended to include other crystalline defects, like dislocations and vacancies. By using a thermodynamic state function which is suitable for a partially open system, open with respect to