Shear band-driven precipitate dispersion for ultrastrong ductile medium-entropy alloys

Tae Jin Jang, Won Seok Choi, Dae Woong Kim, Gwanghyo Choi, Hosun Jun, Alberto Ferrari, Fritz Körmann, Pyuck-Pa Choi () and Seok Su Sohn ()
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Tae Jin Jang: Department of Materials Science and Engineering Korea University
Won Seok Choi: Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology
Dae Woong Kim: Center for High Entropy Alloys Pohang University of Science and Technology
Gwanghyo Choi: Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology
Hosun Jun: Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology
Alberto Ferrari: Department of Materials Science and Engineering Delft University of Technology, Mekelweg 2
Fritz Körmann: Department of Materials Science and Engineering Delft University of Technology, Mekelweg 2
Pyuck-Pa Choi: Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology
Seok Su Sohn: Department of Materials Science and Engineering Korea University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-25031-6

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