ВПЛИВ ВИСОКОЕНТРОПІЙНОГО ПРОШАРКУ СИСТЕМИ CrMnFeCoNi НА МІКРОМЕХАНІЧНІ ВЛАСТИВОСТІ З’ЄДНАНЬ З ЖАРОМІЦНОГО СПЛАВУ ЕІ437Б.

The paper presents the results of investigations on diffusion welding of high-temperature alloy EI437B, using foil from high-entropy alloy of CrMnFeCoNi system as an interlayer. The features of producing foil from high-entropy alloy and its main physical-chemical properties in as-rolled and as-annealed condition are given. Increase of the degree of the foil general deformation to 99.9 % results in up to three times increase of the yield limit, and further annealing of the foil leads to its lowering to values characteristic for EI437B alloy. During diffusion welding the Young’s modulus increased from 165 to 195 GPa in the joint zone corresponding to the high-entropy alloy, which may be indicative of a diffusion-induced redistribution of elements in the interlayer. Chemical element distribution in the joint zone is indicative of their sufficiently high diffusion mobility. It is shown that application of a high-entropy alloy interlayer in vacuum diffusion welding ensures formation of a diffusion zone of a rather homogeneous chemical composition with a monotonic nature of distribution of the main alloying elements. The thermo-deformational impact results in equalizing of the characteristics of hardness and modulus of elasticity in different regions of the joint, and their physical-mechanical properties become similar. [ABSTRACT FROM AUTHOR]