Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys
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 adsorpti...
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| Format: | Article |
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Elsevier BV
2018
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| Online Access: | http://hdl.handle.net/1721.1/117746 https://orcid.org/0000-0003-1973-1703 https://orcid.org/0000-0001-9856-2682 |
| _version_ | 1826215063086694400 |
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| author | Gibson, Michael A. Schuh, Christopher A |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Gibson, Michael A. Schuh, Christopher A |
| author_sort | Gibson, Michael A. |
| collection | MIT |
| description | 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 |
| first_indexed | 2024-09-23T16:15:57Z |
| format | Article |
| id | mit-1721.1/117746 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:15:57Z |
| publishDate | 2018 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1177462022-10-02T07:24:37Z Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys Gibson, Michael A. Schuh, Christopher A Massachusetts Institute of Technology. Department of Materials Science and Engineering Gibson, Michael A. Schuh, Christopher A 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) 2018-09-13T18:28:17Z 2018-09-13T18:28:17Z 2015-06 2015-03 2018-09-13T17:49:35Z Article http://purl.org/eprint/type/JournalArticle 1359-6454 1873-2453 http://hdl.handle.net/1721.1/117746 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 https://orcid.org/0000-0003-1973-1703 https://orcid.org/0000-0001-9856-2682 http://dx.doi.org/10.1016/J.ACTAMAT.2015.05.004 Acta Materialia Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier BV Other repository |
| spellingShingle | Gibson, Michael A. Schuh, Christopher A Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys |
| title | Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys |
| title_full | Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys |
| title_fullStr | Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys |
| title_full_unstemmed | Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys |
| title_short | Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys |
| title_sort | segregation induced changes in grain boundary cohesion and embrittlement in binary alloys |
| url | http://hdl.handle.net/1721.1/117746 https://orcid.org/0000-0003-1973-1703 https://orcid.org/0000-0001-9856-2682 |
| work_keys_str_mv | AT gibsonmichaela segregationinducedchangesingrainboundarycohesionandembrittlementinbinaryalloys AT schuhchristophera segregationinducedchangesingrainboundarycohesionandembrittlementinbinaryalloys |