Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy
The role of a topologically close-packed (TCP) phase (μ phase) on the plastic deformation of a Ni-based superalloy was investigated employing a combination of in situ scanning electron microscope micropillar compression and atomic-scale characterization using atom probe tomography and transmission e...
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Elsevier
2025-02-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525000206 |
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| author | Sangwon Lee Jeonghyeon Do Baig Gyu Choi Ujjval Bansal Christoph Kirchlechner Pyuck-Pa Choi Subin Lee |
| author_facet | Sangwon Lee Jeonghyeon Do Baig Gyu Choi Ujjval Bansal Christoph Kirchlechner Pyuck-Pa Choi Subin Lee |
| author_sort | Sangwon Lee |
| collection | DOAJ |
| description | The role of a topologically close-packed (TCP) phase (μ phase) on the plastic deformation of a Ni-based superalloy was investigated employing a combination of in situ scanning electron microscope micropillar compression and atomic-scale characterization using atom probe tomography and transmission electron microscopy. Micropillar tests revealed two distinct slip behaviors: TCP-free pillars deformed via multiple slip systems, whereas TCP-containing pillars deformed by single slip. Notably, while previous studies have reported fracture at the TCP/γ' interface, our findings revealed that in the TCP-containing pillars, deformation was rarely observed at the interface. Instead, slip predominantly occurred in regions approximately 50–100 nm away from the interface. Chemical analysis near the TCP/γ' interface via APT showed an excess Ta content near the interface increasing the antiphase boundary energy and enhancing local order strengthening. Moreover, an approximate 8% lattice misfit at the TCP/γ' interface, coupled with the elastic mismatch between the two phases, provided additional slip resistance in the vicinity of the interface. This study sheds light on the intricate interplay between TCP phase formation, microstructural evolution, and mechanical properties in Ni-based superalloys offering valuable insights into the role of the TCP phases. |
| format | Article |
| id | doaj-art-ab1a36b8fbc24be8aaf8953a204b421d |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-ab1a36b8fbc24be8aaf8953a204b421d2025-01-18T05:03:20ZengElsevierMaterials & Design0264-12752025-02-01250113600Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloySangwon Lee0Jeonghyeon Do1Baig Gyu Choi2Ujjval Bansal3Christoph Kirchlechner4Pyuck-Pa Choi5Subin Lee6Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141 Republic of Korea; Department of High Temperature Materials, Korea Institute of Materials Science (KIMS), Changwon 51508 Republic of Korea; Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76131 GermanyDepartment of High Temperature Materials, Korea Institute of Materials Science (KIMS), Changwon 51508 Republic of KoreaDepartment of High Temperature Materials, Korea Institute of Materials Science (KIMS), Changwon 51508 Republic of KoreaInstitute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76131 GermanyInstitute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76131 GermanyDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141 Republic of Korea; Corresponding authors.Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76131 Germany; Corresponding authors.The role of a topologically close-packed (TCP) phase (μ phase) on the plastic deformation of a Ni-based superalloy was investigated employing a combination of in situ scanning electron microscope micropillar compression and atomic-scale characterization using atom probe tomography and transmission electron microscopy. Micropillar tests revealed two distinct slip behaviors: TCP-free pillars deformed via multiple slip systems, whereas TCP-containing pillars deformed by single slip. Notably, while previous studies have reported fracture at the TCP/γ' interface, our findings revealed that in the TCP-containing pillars, deformation was rarely observed at the interface. Instead, slip predominantly occurred in regions approximately 50–100 nm away from the interface. Chemical analysis near the TCP/γ' interface via APT showed an excess Ta content near the interface increasing the antiphase boundary energy and enhancing local order strengthening. Moreover, an approximate 8% lattice misfit at the TCP/γ' interface, coupled with the elastic mismatch between the two phases, provided additional slip resistance in the vicinity of the interface. This study sheds light on the intricate interplay between TCP phase formation, microstructural evolution, and mechanical properties in Ni-based superalloys offering valuable insights into the role of the TCP phases.http://www.sciencedirect.com/science/article/pii/S0264127525000206Ni-based single crystal superalloyTopologically close-packed (TCP) phaseDeformation behaviorMicropillar compressionAtom probe tomography (APT) |
| spellingShingle | Sangwon Lee Jeonghyeon Do Baig Gyu Choi Ujjval Bansal Christoph Kirchlechner Pyuck-Pa Choi Subin Lee Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy Materials & Design Ni-based single crystal superalloy Topologically close-packed (TCP) phase Deformation behavior Micropillar compression Atom probe tomography (APT) |
| title | Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy |
| title_full | Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy |
| title_fullStr | Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy |
| title_full_unstemmed | Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy |
| title_short | Local plastic deformation in the vicinity of topologically close-packed phases in a Ni-based single crystal superalloy |
| title_sort | local plastic deformation in the vicinity of topologically close packed phases in a ni based single crystal superalloy |
| topic | Ni-based single crystal superalloy Topologically close-packed (TCP) phase Deformation behavior Micropillar compression Atom probe tomography (APT) |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525000206 |
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