About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Dislocation Structure in FeCrAl Alloys through Advanced In-situ Microscopy Experiments |
Author(s) |
Keyou Mao, Maxim Gussev, Caleb Massey, Kinga Unocic, Yukinori Yamamoto, Kevin Field, Philip Edmondson |
On-Site Speaker (Planned) |
Keyou Mao |
Abstract Scope |
In-situ mechanical testing and microstructural analysis was used to probe differences in the deformation behavior of an accident tolerant ferritic alloy following neutron irradiation. Body-centered cubic (bcc) crystal structure deformation is dominated by slip behavior on {110}, {112}, and {123} planes controlled by screw dislocation motion. After irradiation, the dislocation structure is affected by high-density defects leading to localized dislocation channeling and strain bursts. This work investigates this irradiation-induced transition in deformation modes in a Fe-13Cr-5Al-2Mo (wt.%) alloy. Loops and Cr-rich α’ precipitates formed in irradiated FeCrAl alloys hinder dislocation movement. In-situ scanning electron microscopic strain experiments were applied at different strain levels, followed by transmission electron microscopy (TEM) characterization of the dislocation relaxation, patterning, density and their interactive slip systems at various locations such as grain boundaries and interior grains. Preliminary results by scanning TEM dispersive X-ray spectroscopy and atom probe tomography suggest the dissociation of α’ precipitation. |
Proceedings Inclusion? |
Planned: |