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Grain boundary character distribution of CoCrFeMnNi high-entropy alloy.

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Title: Grain boundary character distribution of CoCrFeMnNi high-entropy alloy.
Authors: Chirayutthanasak, Ooraphan1 (AUTHOR), Sarochawikasit, Rajchawit1 (AUTHOR), Promoppatum, Patcharapit2 (AUTHOR), Ouyang, Fan-Yi3 (AUTHOR), Panwisawas, Chinnapat4 (AUTHOR), Han, Junhee5 (AUTHOR), Thirathipviwat, Pramote1,6 (AUTHOR) pramote-thirathipviwat-js@ynu.ac.jp, Ratanaphan, Sutatch1,7 (AUTHOR) sutatch.ratanaphan@mail.kmutt.ac.th
Source: Scripta Materialia. Sep2026, Vol. 282, pN.PAG-N.PAG. 1p.
Subjects: Crystal grain boundaries, High-entropy alloys, Electron backscattering, Entropy, Face centered cubic structure
Abstract: The grain boundary character distribution of an equiatomic CoCrFeMnNi high-entropy alloy (HEA) was statistically determined using electron backscatter diffraction. The face-centered cubic (fcc) HEA exhibits an exceptionally high fraction of the Σ3 coherent twin boundary, constituting 94% of the total Σ3 grain boundary (GB) population, which is nearly double the levels observed in Cu (51%) and Ni (61%). This reflects an increased thermodynamic preference for the lowest-energy state, driven by suppressed GB energy anisotropy and a deeper relative energy minimum at the coherent twin configuration compared to fcc elemental metals (Au, Cu, and Ni). Beyond Σ3 misorientation, high-entropy effects from configurational entropy and local lattice distortion further stabilize {111} symmetrical twist configurations, leading to significant population enrichment across multiple misorientations, including Σ7, Σ13b, and Σ21a. Ultimately, these findings reinforce the high-entropy grain boundaries (HEGBs) framework, providing a foundation for next-generation multifunctional high-entropy materials. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The grain boundary character distribution of an equiatomic CoCrFeMnNi high-entropy alloy (HEA) was statistically determined using electron backscatter diffraction. The face-centered cubic (fcc) HEA exhibits an exceptionally high fraction of the Σ3 coherent twin boundary, constituting 94% of the total Σ3 grain boundary (GB) population, which is nearly double the levels observed in Cu (51%) and Ni (61%). This reflects an increased thermodynamic preference for the lowest-energy state, driven by suppressed GB energy anisotropy and a deeper relative energy minimum at the coherent twin configuration compared to fcc elemental metals (Au, Cu, and Ni). Beyond Σ3 misorientation, high-entropy effects from configurational entropy and local lattice distortion further stabilize {111} symmetrical twist configurations, leading to significant population enrichment across multiple misorientations, including Σ7, Σ13b, and Σ21a. Ultimately, these findings reinforce the high-entropy grain boundaries (HEGBs) framework, providing a foundation for next-generation multifunctional high-entropy materials. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:13596462
DOI:10.1016/j.scriptamat.2026.117401