Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys
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Segregation-induced_changes_in_grain_boundary_cohe.pdf
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Author(s)
Gibson, Michael A.
Schuh, Christopher A
Date Issued
June 2015
Journal
Acta Materialia
Publisher
Elsevier BV
Citation
Gibson, Michael A., and Christopher A. Schuh. “Segregation-Induced Changes in Grain Boundary Cohesion and Embrittlement in Binary Alloys.” Acta Materialia 95 (August 2015): 145–155 © 2015 Acta Materialia Inc.Published by Elsevier Ltd
Version
Author's final manuscript
Abstract
Grain boundary embrittlement occurs when a solute enriches at a grain boundary and lowers its cohesive energy. While grain boundary enrichment is often attributed to equilibrium segregation effects, most models of embrittlement consider either the energetics of decohesion or the equilibrium adsorption at the boundary, but not both phenomena together. We develop a model for the change in cohesive energy of a grain boundary of a pure metal upon introduction of solute under conditions of equilibrium segregation prior to fracture. A heuristic grain boundary cohesion map is presented to delineate whether a given solute-solvent pair will exhibit weakening or strengthening of grain boundaries. The analysis helps to clarify that grain boundary embrittlement requires a solute that will both lower the cohesive energy of the boundary and segregate in the first place. The map reasonably captures known metal-metal embrittling pairs. Keywords: Grain-boundary segregation; Embrittlement; Thermodynamic modeling; Solubility
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/J.ACTAMAT.2015.05.004
