The dual role of coherent twin boundaries in hydrogen embrittlement
Hydrogen embrittlement (HE) causes engineering alloys to fracture unexpectedly, often at considerable economic or environmental cost. Inaccurate predictions of component lifetimes arise from inadequate understanding of how alloy microstructure affects HE. Here we investigate hydrogen-assisted fractu...
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| Format: | Article |
| Language: | en_US |
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Nature Publishing Group
2016
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| Online Access: | http://hdl.handle.net/1721.1/103051 https://orcid.org/0000-0002-6934-1415 https://orcid.org/0000-0003-3949-0441 |
| _version_ | 1826190582564782080 |
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| author | Seita, Matteo Hanson, John Paul Gradecak, Silvija Demkowicz, Michael J. |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Seita, Matteo Hanson, John Paul Gradecak, Silvija Demkowicz, Michael J. |
| author_sort | Seita, Matteo |
| collection | MIT |
| description | Hydrogen embrittlement (HE) causes engineering alloys to fracture unexpectedly, often at considerable economic or environmental cost. Inaccurate predictions of component lifetimes arise from inadequate understanding of how alloy microstructure affects HE. Here we investigate hydrogen-assisted fracture of a Ni-base superalloy and identify coherent twin boundaries (CTBs) as the microstructural features most susceptible to crack initiation. This is a surprising result considering the renowned beneficial effect of CTBs on mechanical strength and corrosion resistance of many engineering alloys. Remarkably, we also find that CTBs are resistant to crack propagation, implying that hydrogen-assisted crack initiation and propagation are governed by distinct physical mechanisms in Ni-base alloys. This finding motivates a re-evaluation of current lifetime models in light of the dual role of CTBs. It also indicates new paths to designing materials with HE-resistant microstructures. |
| first_indexed | 2024-09-23T08:42:12Z |
| format | Article |
| id | mit-1721.1/103051 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:42:12Z |
| publishDate | 2016 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1030512022-09-23T14:01:20Z The dual role of coherent twin boundaries in hydrogen embrittlement Seita, Matteo Hanson, John Paul Gradecak, Silvija Demkowicz, Michael J. Massachusetts Institute of Technology. Department of Materials Science and Engineering Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Seita, Matteo Hanson, John Paul Gradecak, Silvija Demkowicz, Michael J. Hydrogen embrittlement (HE) causes engineering alloys to fracture unexpectedly, often at considerable economic or environmental cost. Inaccurate predictions of component lifetimes arise from inadequate understanding of how alloy microstructure affects HE. Here we investigate hydrogen-assisted fracture of a Ni-base superalloy and identify coherent twin boundaries (CTBs) as the microstructural features most susceptible to crack initiation. This is a surprising result considering the renowned beneficial effect of CTBs on mechanical strength and corrosion resistance of many engineering alloys. Remarkably, we also find that CTBs are resistant to crack propagation, implying that hydrogen-assisted crack initiation and propagation are governed by distinct physical mechanisms in Ni-base alloys. This finding motivates a re-evaluation of current lifetime models in light of the dual role of CTBs. It also indicates new paths to designing materials with HE-resistant microstructures. National Science Foundation (U.S.) (Award number DMR—0213282) United States. Dept. of Energy. Office of Science (Graduate Fellowship Program, contract no. DE-AC05-06OR23100) 2016-06-08T14:16:09Z 2016-06-08T14:16:09Z 2015-02 2014-07 Article http://purl.org/eprint/type/JournalArticle 2041-1723 http://hdl.handle.net/1721.1/103051 Seita, Matteo, John P. Hanson, Silvija Gradečak, and Michael J. Demkowicz. “The Dual Role of Coherent Twin Boundaries in Hydrogen Embrittlement.” Nat Comms 6 (February 5, 2015): 6164. https://orcid.org/0000-0002-6934-1415 https://orcid.org/0000-0003-3949-0441 en_US http://dx.doi.org/10.1038/ncomms7164 Nature Communications Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature Publishing Group |
| spellingShingle | Seita, Matteo Hanson, John Paul Gradecak, Silvija Demkowicz, Michael J. The dual role of coherent twin boundaries in hydrogen embrittlement |
| title | The dual role of coherent twin boundaries in hydrogen embrittlement |
| title_full | The dual role of coherent twin boundaries in hydrogen embrittlement |
| title_fullStr | The dual role of coherent twin boundaries in hydrogen embrittlement |
| title_full_unstemmed | The dual role of coherent twin boundaries in hydrogen embrittlement |
| title_short | The dual role of coherent twin boundaries in hydrogen embrittlement |
| title_sort | dual role of coherent twin boundaries in hydrogen embrittlement |
| url | http://hdl.handle.net/1721.1/103051 https://orcid.org/0000-0002-6934-1415 https://orcid.org/0000-0003-3949-0441 |
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