Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys
| Autor: | Christopher A. Schuh, Michael Andrew Gibson |
|---|---|
| Přispěvatelé: | Massachusetts Institute of Technology. Department of Materials Science and Engineering, Gibson, Michael A., Schuh, Christopher A |
| Rok vydání: | 2015 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Polymers and Plastics Metallurgy Metals and Alloys Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Binary number Thermodynamics Boundary (topology) Electronic Optical and Magnetic Materials Ceramics and Composites Fracture (geology) Cohesion (chemistry) Grain boundary diffusion coefficient Grain boundary Embrittlement Grain boundary strengthening |
| Zdroj: | Other repository |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2015.05.004 |
| Popis: | 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 United States. Army Research Office (Grant W911NF-14-1-0539) United States. Department of Energy. Office of Basic Energy Sciences (Award DE-SC0001299) |
| Databáze: | OpenAIRE |
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