Orientation-related twinning and dislocation glide in a cantor high entropy alloy at room and cryogenic temperature studied by in situ TEM straining

0544795 - ÚFM 2022 RIV CH eng J - Journal Article
Oliveros, D. - Fraczkiewicz, A. - Dlouhý, Antonín - Zhang, C. - Song, HX. - Sandfeld, S. - Legros, M.
Orientation-related twinning and dislocation glide in a cantor high entropy alloy at room and cryogenic temperature studied by in situ TEM straining.
Materials Chemistry and Physics. Roč. 272, NOV (2021), č. článku 124955. ISSN 0254-0584. E-ISSN 1879-3312
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : stacking-fault energies * 60-degrees dislocations * mechanical-properties * stainless-steel * plasticity * In situ TEM * High entropy alloy * Plasticity * Twinning * Dislocation
OECD category: Materials engineering
Impact factor: 4.778, year: 2021
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0254058421007380?via%3Dihub

In situ straining experiments were performed in a TEM on an equimolar CoCrFeMnNi (Cantor) high entropy alloy at room and cryogenic temperature. Perfect and partial dislocation activity were recorded in both cases. Twinning directly follows the development of partial dislocation shearing that has various origins (perfect dislocation splitting, anchoring). It is shown that, although twinning is more frequently observed at liquid nitrogen temperature, its prevalence depends mainly on crystal orientation. As a result, twinning and perfect dislocation plasticity are likely to occur jointly in random oriented polycrystals, even at early stages of deformation.
Permanent Link: http://hdl.handle.net/11104/0321606