Nam, Seungjin Kim, Sang Jun Yoon, Kook Noh Kim, Moon J. Quevedo-Lopez, Manuel Hwang, Jun Yeon Park, Eun Soo Choi, Hyunjoo 2024-01-19T10:32:46Z 2024-01-19T10:32:46Z 2022-12-22 2022-12 0264-1275 https://pubs.kist.re.kr/handle/201004/114229 To develop alloys with high strength and reasonable ductility, CoCrFeNi-based metastable complex -concentrated alloys were designed using composition-property contour maps. The map was constructed by exploring the phase stability and mechanical behaviors of a series of CoCrFeNi alloy thin films synthe-sized via solid-state alloying of multilayer thin films. The concentrations of Co and Ni were key to activate metastable deformation behaviors by reducing the stacking fault energy of alloys and improve solid -solution strengthening, as expected from the atomic-level complexity related to the electronegativity dif-ference. By optimizing the Co and Ni concentrations based on the composition-phase/mechanical prop-erty contour maps, we activated the combined deformation behavior of mechanical twinning and phase transformation. This resulted in a Co33Cr25Fe25Ni17 metastable complex-concentrated alloy with excel-lent tensile properties-yield strength of 234 MPa, ultimate tensile strength of 720 MPa, and elongation to failure of 80%. The proposed approach provides a useful guideline for the design of complex -concentrated alloys with customized properties through property predictive control.(c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/). English Elsevier BV Design of metastable complex-concentrated alloys through composition tailoring Article 10.1016/j.matdes.2022.111391 1 Materials & Design, v.224 Materials & Design 224 Y scie scopus 000891745700002 Materials Science, Multidisciplinary Materials Science Article HIGH-ENTROPY ALLOYS STACKING-FAULT ENERGIES MECHANICAL-PROPERTIES DEFORMATION-BEHAVIOR PHASE-FORMATION GRAIN-SIZE MICROSTRUCTURE TRANSFORMATION TWIP MN We proposed alloy exploration Alloy design Multilayer thin film Solid-state alloying Composition -dependent properties Metastable complex -concentrated alloy