Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 473, Issue 1-2, Pages 226-232Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.04.007
Keywords
non-equilibrium segregation; grain boundary; plastic deformation; embrittlement; metals and alloys
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On the basis of the vacancy-solute complex mechanism, a model describing deformation-induced non-equilibrium grain boundary segregation of solute is established for dilute alloys, which includes the quasi-thermodynamics and kinetics. The model is applied to the evaluation of non-equilibrium grain boundary segregation of boron during high temperature plastic deformation in an austenitic steel microstructure. The deformation-induced non-equilibrium segregation increases with decreasing temperature and is considerably larger than the thermal equilibrium one, especially in the temperature range below similar to 750 degrees C. In addition, at a given temperature the non-equilibrium segregation augments with rising strain rate as the deformation-created supersaturated vacancy concentration increases. The predictions are generally consistent with some experimental observations. (C) 2007 Elsevier B.V. All rights reserved.
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