Editors have highlighted the following attributes while ensuring the content's credibility:Thermodynamic phase diagram, schematic illustration of microstructure, and tensile properties of Ni-based high-entropy alloy. Large grains in a metal enhance ductility by allowing it to stretch, while small grains increase strength by making the metal harder. The POSTECH research team developed a unique "core–shell" structure inside a nickel (Ni)-based high-entropy alloy by applying hot rolling—a process of rolling the metal at high temperatures—together with precise heat treatment. The newly developed alloy demonstrated outstanding performance, recording a yield strength of 1,029 MPa, a tensile strength of 1,271 MPa, and an elongation of 31.1%. More information: Hyojin Park et al, Manipulating grain boundary migration to fabricate integral core–shell structure with enhanced strain hardening in Ni-based high-entropy alloy, Journal of Materials Science & Technology (2025).