 This study examined the microstructure, phase composition, and mechanical properties of a refractory high-entropy superalloy, almost 0.5 Nbeta 0.5 Tzr. The alloy consisted of two distinct phases, one consisting of cuboidal nanoprecipetates aligned in rows along less than 100 type directions, and another consisting of channels between these precipitates. These phases were found to be coherent and have the same crystallographic orientation within the former grains. The alloy's yield strength was superior to that of nickel-based superalloys at temperatures ranging from 20°C to 1200°C. This article was authored by Oleg Nsenkov, Dieter Ishim, David N. Seidman, and others.