About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
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Presentation Title |
Dislocation Core Structure from Diffuse Scattering Below the Bragg Peaks |
Author(s) |
Tamás Ungár, Gabor Ribarik |
On-Site Speaker (Planned) |
Tamás Ungár |
Abstract Scope |
The experimental obtainment of dislocation core (DC) structure is not easy. However, ample simulations show that DCs can be quite extended up to tens of the lengths of the Burgers vector, cf. [1,2]. It has long been observed that the intensity of diffuse scattering below Bragg peaks (DSbBP) in diffraction experiments increases with the dislocation density. The peak to background ratio in synchrotron experiments is usually good enough to determine dislocations induced DSbBP. We will show that when the dislocation density is in the range of 10^15 m^-2, or above, the DC volume fractions become substantial and can be evaluated for the width of cores. In electrodeposited nanocrystalline Ni-15%Fe alloy specimens cold-rolled at RT or liquid nitrogen the core width decreased with increasing dislocation density.
1. M. Boleininger, et al. Phys. Rev. Mater. 2 (2018) 083803
2. A.S.K. Mohammed et. al. Acta Mater. 233 (2022) 117989 |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Other |