About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
In-situ Mapping for Diffusion Investigations and the Associated Vacancies & Creep Activities in High Entropy Alloys |
Author(s) |
E-Wen Huang, Mao-Yuan Luo |
On-Site Speaker (Planned) |
E-Wen Huang |
Abstract Scope |
Recalling our earlier in-situ neutron diffraction results showing creep, we applied Simmons–Balluffi methods, positron measurements, and in-situ neutron diffraction to estimate the vacancy of high entropy alloys (HEAs) using Cu as a benchmark. The results show the importance of resolving the local distributions of the elements to further examine diffusion. In this talk, we report the latest in-situ synchrotron spatially-resolved mapping. The local elements are quantified to map the contour of the mixing enthalpy, entropy, and the associated descriptors. The vacancy-dependent effective free volumes in the HEAs are greater than those in Cu, implying the easier formation of vacancies by lattice structure relaxation of HEAs at elevated temperatures. Spatially resolved synchrotron X-ray measurements revealed different characteristics of different HEAs subjected to quasi-equilibrium conditions at high temperatures. Element-dependent behavior revealed by in-situ X-ray fluorescence (XRF) mapping reveals the dominant effect and the associated mechanisms, which will be presented in this talk. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, ICME, Phase Transformations |