Abstract
The phase transformations proceeding in as-cast high-entropy FeCoCrNiVAl alloy are studied using high-temperature in situ X-ray diffraction in a helium atmosphere at 293–1273 K. In starting state, this alloy is a single-phase bcc solid solution ordered according to B2 type. It is found for the first time that a tetragonal σ phase of CrFe type forms at 1073 K on the alloy. The surface layer of the σ phase is ~22 μm thick. The influence of annealing on variation in phase composition of the highentropy alloy is analyzed. Optical and scanning electron microscopy is employed to examine the alloy microstructure. The microhardness and reduced Young’s modulus of the high-entropy alloy are determined at room temperature.
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