Formation of surface layers from highly entropic materials with shape memory effect

Abstract

To expand the practical use of high-entropy and material with shape memory effect (SME), we have developed a technology to form functionally oriented surface layers with five and six-component powder compositions CoCuTiZrHf, NiCoTiZrHf, NiCuTiZrHf, ZrCuNiCoTi, TiNiZrHfCoCu. The coatings were deposited under conditions of high-energy effects, including mechanical activation of the applied material, high-velocity oxygen-fuel spraying in a chamber with argon, followed by thermomechanical treatment in a single technological cycle on the patented equipment. Electron-microscopic and X-ray diffraction studies have shown that the obtained coatings correspond to SME materials with a grain size of 80–400 nm. In accordance with energy criterion, we have predicted the cyclic durability of steel samples with a surface layer made of multicomponent SME materials. We took into account the energy intensity of the coating material and the structural factor. The energy intensity of the alloy is determined by the thermodynamic characteristics and the state diagram of the systems. The structural factor is based on the analysis of the structural-phase state by the method of multifractal parametrization taking into account homogeneity, fractal dimensionality, adaptability.To expand the practical use of high-entropy and material with shape memory effect (SME), we have developed a technology to form functionally oriented surface layers with five and six-component powder compositions CoCuTiZrHf, NiCoTiZrHf, NiCuTiZrHf, ZrCuNiCoTi, TiNiZrHfCoCu. The coatings were deposited under conditions of high-energy effects, including mechanical activation of the applied material, high-velocity oxygen-fuel spraying in a chamber with argon, followed by thermomechanical treatment in a single technological cycle on the patented equipment. Electron-microscopic and X-ray diffraction studies have shown that the obtained coatings correspond to SME materials with a grain size of 80–400 nm. In accordance with energy criterion, we have predicted the cyclic durability of steel samples with a surface layer made of multicomponent SME materials. We took into account the energy intensity of the coating material and the structural factor. The energy intensity of the alloy is determined by the thermodynam...