On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies
The evolution of dislocation density with creep strain in single-crystal superalloys is studied quantitatively using high-resolution electron backscatter diffraction (HR-EBSD) and electron channelling contrast imaging under controlled diffraction conditions (cECCI). Data regarding dislocation densit...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2019
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| _version_ | 1826286330340966400 |
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| author | Sulzer, S Li, Z Zaefferer, S Haghighat, SMH Wilkinson, A Raabe, D Reed, R |
| author_facet | Sulzer, S Li, Z Zaefferer, S Haghighat, SMH Wilkinson, A Raabe, D Reed, R |
| author_sort | Sulzer, S |
| collection | OXFORD |
| description | The evolution of dislocation density with creep strain in single-crystal superalloys is studied quantitatively using high-resolution electron backscatter diffraction (HR-EBSD) and electron channelling contrast imaging under controlled diffraction conditions (cECCI). Data regarding dislocation density/structure is measured for deformation at 900 °C and 450 MPa up to ≈ 1% plastic strain. Effects of chemical composition are elucidated via three purpose-designed superalloys of differing rhenium and ruthenium contents. The evidence indicates that dislocation avalanching is already prevalent at plastic strains of ≈ 0.1%; thereafter, an exponential decay in the dislocation multiplication rate is indicative of self-hardening due to dislocation constriction within the matrix channels, as confirmed by the imaging. The results are rationalised using discrete dislocation dynamics modelling: a universal dislocation evolution law emerges, which will be useful for alloy design efforts. |
| first_indexed | 2024-03-07T01:42:09Z |
| format | Journal article |
| id | oxford-uuid:973e6714-e4f9-49d3-bbed-22334f8d5e0a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:42:09Z |
| publishDate | 2019 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:973e6714-e4f9-49d3-bbed-22334f8d5e0a2022-03-26T23:58:10ZOn the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:973e6714-e4f9-49d3-bbed-22334f8d5e0aEnglishSymplectic ElementsElsevier2019Sulzer, SLi, ZZaefferer, SHaghighat, SMHWilkinson, ARaabe, DReed, RThe evolution of dislocation density with creep strain in single-crystal superalloys is studied quantitatively using high-resolution electron backscatter diffraction (HR-EBSD) and electron channelling contrast imaging under controlled diffraction conditions (cECCI). Data regarding dislocation density/structure is measured for deformation at 900 °C and 450 MPa up to ≈ 1% plastic strain. Effects of chemical composition are elucidated via three purpose-designed superalloys of differing rhenium and ruthenium contents. The evidence indicates that dislocation avalanching is already prevalent at plastic strains of ≈ 0.1%; thereafter, an exponential decay in the dislocation multiplication rate is indicative of self-hardening due to dislocation constriction within the matrix channels, as confirmed by the imaging. The results are rationalised using discrete dislocation dynamics modelling: a universal dislocation evolution law emerges, which will be useful for alloy design efforts. |
| spellingShingle | Sulzer, S Li, Z Zaefferer, S Haghighat, SMH Wilkinson, A Raabe, D Reed, R On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies |
| title | On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies |
| title_full | On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies |
| title_fullStr | On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies |
| title_full_unstemmed | On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies |
| title_short | On the assessment of creep damage evolution in nickel-based superalloys through correlative HR-EBSD and cECCI studies |
| title_sort | on the assessment of creep damage evolution in nickel based superalloys through correlative hr ebsd and cecci studies |
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