About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
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Presentation Title |
Electron Diffraction-based Analysis of the Role of Chemical Short-range Order on the Dynamic Deformation Response of FCC and BCC Multi-principal Element Alloys |
Author(s) |
Daniel L. Foley, David Beaudry, Elaf Anber, Yevgeny Rakita Shlafstein, Partha Pratim Das, Simon J. L. Billinge, Andrew Matejunas, Carolina Frey, Leslie Lamberson, Tresa Pollock, Irene Beyerlein, Garritt Tucker, Chris Weinberger, Mitra L. Taheri |
On-Site Speaker (Planned) |
Daniel L. Foley |
Abstract Scope |
A chemically complex matrix with the potential for chemical ordering distinguishes multi-principal element alloys (MPEAs) from conventional alloys. As this pertains to mechanical behavior, a nominally disordered matrix presents a non-uniform energetic landscape for dislocation motion which can be modulated by varying degrees of ordering. Such energetics can lead to the development of microstructural features such as dislocation cells, twins, microbands, and martensite, the evolution of which are important in both in-service plastic response and the potential for tunable deformation processing. The present work investigates the effect of chemical short-range order (SRO) in FCC CoCrNi and BCC NbTiZr alloys on microstructural evolution due to high strain rate compression. Samples of each alloy were heat treated to induce different degrees of SRO and dynamically compressed via Kolsky (split-Hopkinson pressure) bar. Electron microscopy diffraction-based techniques are used to both measure the degree of chemical ordering as well as characterize the deformation substructure. |
Proceedings Inclusion? |
Undecided |