Segregation-assisted plasticity in Ni-based superalloys
Correlative high resolution transmission electron microscopy and energydispersive X-ray spectroscopy are used to study deformation-induced planar faults in the single crystal superalloy MD2 crept at 800 ◦C and 650 MPa. Segregation of Cr and Co at microtwins, anti-phase boundaries (APB) and complex/s...
| Main Authors: | , , , , |
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| Format: | Journal article |
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Springer US
2018
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| _version_ | 1826286469442961408 |
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| author | Barba Cancho, D Smith, T Miao, J Mills, M Reed, R |
| author_facet | Barba Cancho, D Smith, T Miao, J Mills, M Reed, R |
| author_sort | Barba Cancho, D |
| collection | OXFORD |
| description | Correlative high resolution transmission electron microscopy and energydispersive X-ray spectroscopy are used to study deformation-induced planar faults in the single crystal superalloy MD2 crept at 800 ◦C and 650 MPa. Segregation of Cr and Co at microtwins, anti-phase boundaries (APB) and complex/superlattice extrinsic and intrinsic stacking faults (CESF/SESF and CISF/SISF) is confirmed and quantified. The extent of this is found to depend upon the fault type, being most pronounced for the APB. The CESF/SESF is studied in detail due to its role as a precursor of the microtwins causing the majority of plasticity under these conditions. Quantitative modelling is carried out to rationalize the findings; the experimental results are consistent with a greater predicted velocity for the lengthening of the CESF/SESF – compared with the other types of fault – and hence confirm its role in the diffusion-assisted plasticity needed for the microtwinning mechanism to be operative |
| first_indexed | 2024-03-07T01:44:14Z |
| format | Journal article |
| id | oxford-uuid:97deeca5-e42c-4e63-96e4-bbf912d786c4 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:44:14Z |
| publishDate | 2018 |
| publisher | Springer US |
| record_format | dspace |
| spelling | oxford-uuid:97deeca5-e42c-4e63-96e4-bbf912d786c42022-03-27T00:03:01ZSegregation-assisted plasticity in Ni-based superalloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:97deeca5-e42c-4e63-96e4-bbf912d786c4Symplectic Elements at OxfordSpringer US2018Barba Cancho, DSmith, TMiao, JMills, MReed, RCorrelative high resolution transmission electron microscopy and energydispersive X-ray spectroscopy are used to study deformation-induced planar faults in the single crystal superalloy MD2 crept at 800 ◦C and 650 MPa. Segregation of Cr and Co at microtwins, anti-phase boundaries (APB) and complex/superlattice extrinsic and intrinsic stacking faults (CESF/SESF and CISF/SISF) is confirmed and quantified. The extent of this is found to depend upon the fault type, being most pronounced for the APB. The CESF/SESF is studied in detail due to its role as a precursor of the microtwins causing the majority of plasticity under these conditions. Quantitative modelling is carried out to rationalize the findings; the experimental results are consistent with a greater predicted velocity for the lengthening of the CESF/SESF – compared with the other types of fault – and hence confirm its role in the diffusion-assisted plasticity needed for the microtwinning mechanism to be operative |
| spellingShingle | Barba Cancho, D Smith, T Miao, J Mills, M Reed, R Segregation-assisted plasticity in Ni-based superalloys |
| title | Segregation-assisted plasticity in Ni-based superalloys |
| title_full | Segregation-assisted plasticity in Ni-based superalloys |
| title_fullStr | Segregation-assisted plasticity in Ni-based superalloys |
| title_full_unstemmed | Segregation-assisted plasticity in Ni-based superalloys |
| title_short | Segregation-assisted plasticity in Ni-based superalloys |
| title_sort | segregation assisted plasticity in ni based superalloys |
| work_keys_str_mv | AT barbacanchod segregationassistedplasticityinnibasedsuperalloys AT smitht segregationassistedplasticityinnibasedsuperalloys AT miaoj segregationassistedplasticityinnibasedsuperalloys AT millsm segregationassistedplasticityinnibasedsuperalloys AT reedr segregationassistedplasticityinnibasedsuperalloys |