Abstract
High-entropy alloys which is a brand-new concept metallic material, have excellent mechanical properties and have attracted a lot of attention. An improvement of the mechanical properties by microstructure control is important even for high-entropy alloys. A harmonic structure has fine grain regions which are arranged in a three-dimensional network, and coarse grain regions which are arranged between them. The harmonic structure materials exhibit excellent mechanical properties with high strength and high ductility. Cantor alloy powder, which is a typical high-entropy alloy, is produced into a harmonic structure Cantor alloy by applying the mechanical milling and spark plasma sintering methods. The harmonic structure Cantor alloy showed superior mechanical properties with higher strength and higher ductility than the homogeneous grain material. In addition, it showed even better mechanical properties in a low temperature environment. It is clarified that the control of deformation twins is important for improving the mechanical properties of the harmonic structure Cantor alloy.
