Temperature dependencies of the elastic moduli and thermal expansion coefficient of an equiatomic, single-phase CoCrFeMnNi high-entropy alloy

•An FCC CoCrFeMnNi high-entropy alloy (HEA) was cast and processed by swaging.•Recrystallization resulted in homogenous microstructure (grain size 15μm).•The HEA is nearly untextured after swaging (60% reduction) and recrystallization.•First report of the thermal expansion coefficient between 300 and 1270K.•Elastic moduli measured between 200 and 1000K are reported for the first time. The equiatomic CoCrFeMnNi alloy is now regarded as a model face-centered cubic single-phase high-entropy alloy. Therefore, determination of its intrinsic properties such as the temperature dependencies of elastic moduli and thermal expansion coefficient are important to improve understanding of this new class of material. These temperature dependencies were measured over a large temperature range (200–1270K) in this study.