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, Seok Su Sohn*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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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.

Original languageEnglish
Article number4703
Number of pages9
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - 2021

Bibliographical note

+ Author Correction https://doi.org/10.1038/s41467-021-26008-1

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