In situ TiN-reinforced CoCr2FeNiTi(0.5) high-entropy alloy composite coating fabricated by laser cladding

摘要

The fcc structural CoCr2 FeNiTi(0.5) high-entropy alloy(HEA) composite coating with TiN particles reinforced was acquired by laser cladding on the commercial904 L stainless steels.The results show that phase structure is mainly composed of fcc solid solution and TiN phases.The coating exhibits excellent structural stability below850℃.The microstructure consists of irregular dendrite and TiN particles.Transmission electron microscopy(TEM) results reveal that the close-packed plane of fcc phase is(111) with interplanar spacing of ~ 0.208 nm.The interface between TiN and fcc matrix is semi-coherent.And the angle of boundary between dendrite and matrix is ~ 65°.The hardness and corrosion resistance of coating have much improvement compared with those of substrate.