Journal article
Simultaneous twinning and microband formation under dynamic compression in a high entropy alloy with a complex energetic landscape
Acta materialia, v 200
01 Nov 2020
Abstract
High entropy alloys (HEAs) have been the subject of significant research in recent years due in part to their excellent mechanical properties and unique microstructure. Chemical disorder in these alloys is thought to lead to a complex energetic environment that affects the nucleation and movement of dislocations. In this study the development of deformation substructures is assessed in the Cantor HEA (CoCr-FeMnNi) due to quasistatic and dynamic compression. Scanning and transmission electron microscopy (SEM/TEM) techniques are used to image and quantify dislocation density. When increasing the strain rate from 10(-3) s(-1) to 5000 s(-1) we observe an increase in the overall dislocation density which leads to the formation of deformation twins. Further at a rate of 8000 s(-1), both deformation twins and microbands become operative plasticity modes, which are usually associated with different extremes of stacking fault energy. To relate this plastic response to chemical disorder, atomistic calculations are used to compute the generalized stacking fault energy curve and approximate the temperature dependence of the intrinsic stacking fault energy for the Cantor alloy, which reveals significant local variation in these critical energetic parameters associated with dislocation and twinning behaviors.
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Details
- Title
- Simultaneous twinning and microband formation under dynamic compression in a high entropy alloy with a complex energetic landscape
- Creators
- D. L. Foley - Johns Hopkins UniversityS. H. Huang - Drexel UniversityE. Anber - Johns Hopkins UniversityL. Shanahan - Drexel UniversityY. Shen - University of FloridaA. C. Lang - American Society For Engineering EducationC. M. Barr - Sandia National LaboratoriesD. Spearot - University of FloridaL. Lamberson - Colorado School of MinesM. L. Taheri - Johns Hopkins University
- Publication Details
- Acta materialia, v 200
- Publisher
- Elsevier
- Number of pages
- 11
- Grant note
- N000141712810 / Office of Naval Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000580631600001
- Scopus ID
- 2-s2.0-85090326735
- Other Identifier
- 991019167560404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering