Print Email Facebook Twitter Shear band-driven precipitate dispersion for ultrastrong ductile medium-entropy alloys Title Shear band-driven precipitate dispersion for ultrastrong ductile medium-entropy alloys Author Jang, Tae Jin (Korea University) Choi, Won Seok (Korea Advanced Institute of Science and Technology) Kim, Dae Woong (Pohang University of Science and Technology) Choi, Gwanghyo (Korea Advanced Institute of Science and Technology) Jun, Hosun (Korea Advanced Institute of Science and Technology) Ferrari, A. (TU Delft Team Marcel Sluiter) Körmann, F.H.W. (TU Delft Team Marcel Sluiter; Max-Planck-Institut für Eisenforschung) Choi, Pyuck Pa (Korea Advanced Institute of Science and Technology) Sohn, Seok Su (Korea University) Date 2021 Abstract Precipitation strengthening has been the basis of physical metallurgy since more than 100 years owing to its excellent strengthening effects. This approach generally employs coherent and nano-sized precipitates, as incoherent precipitates energetically become coarse due to their incompatibility with matrix and provide a negligible strengthening effect or even cause brittleness. Here we propose a shear band-driven dispersion of nano-sized and semicoherent precipitates, which show significant strengthening effects. We add aluminum to a model CoNiV medium-entropy alloy with a face-centered cubic structure to form the L21 Heusler phase with an ordered body-centered cubic structure, as predicted by ab initio calculations. Micro-shear bands act as heterogeneous nucleation sites and generate finely dispersed intragranular precipitates with a semicoherent interface, which leads to a remarkable strength-ductility balance. This work suggests that the structurally dissimilar precipitates, which are generally avoided in conventional alloys, can be a useful design concept in developing high-strength ductile structural materials. To reference this document use: http://resolver.tudelft.nl/uuid:631c61a9-cb02-4e20-a80d-40bed342e036 DOI https://doi.org/10.1038/s41467-021-25031-6 ISSN 2041-1723 Source Nature Communications, 12 (1) Bibliographical note + Author Correction https://doi.org/10.1038/s41467-021-26008-1 Part of collection Institutional Repository Document type journal article Rights © 2021 Tae Jin Jang, Won Seok Choi, Dae Woong Kim, Gwanghyo Choi, Hosun Jun, A. Ferrari, F.H.W. Körmann, Pyuck Pa Choi, Seok Su Sohn Files PDF s41467_021_25031_6.pdf 3.09 MB PDF s41467_021_26008_1.pdf 437.91 KB Close viewer /islandora/object/uuid:631c61a9-cb02-4e20-a80d-40bed342e036/datastream/OBJ1/view