Microstructural characterization and oxidation resistance of multicomponent equiatomic CoCrCuFeNi–TiO high-entropy alloy

Qing-dong Qin^1,2，Jin-bo Qu³，Yong-e Hu²，Yu-jiao Wu^2,4，Xiang-dong Su¹

1. Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province,Guizhou Institute of Technology2. Department of Materials & Metallurgy Engineering,Guizhou Institute of Technology3. Merchant Marine college,Shanghai Maritime University4. 2011 Special Functional Materials Collaborative Innovation Center of Guizhou Province

摘 要：CoCrCuFeNi–TiO was prepared by arc melting of the pure elements and Ti₂CO powder under an Ar atmosphere. Both CoCrCuFe Ni and CoCrCuFeNi–TiO alloys are composed of a face-centered cubic（fcc） solid solution, whereas the alloys of CoCrCuFeNi–TiO are basically composed of an fcc solid solution and TiO crystals. The microstructures of CoCrCuFeNi–TiO are identified as dendrite and interdendrite structures such as CoCrCuFeNi. The morphology of TiO is identified as an equiaxed crystal with a small amount of added Ti₂CO. By increasing the amount of Ti₂CO added, the TiO content was dramatically increased and part of the equiaxed crystals changed to a dendrite structure. A test of the oxidation resistance demonstrates that the oxidation resistance of CoCrCuFeNi–TiO is better than that of CoCrCu Fe Ni. However, as the TiO content increases further, a corresponding decrease is observed in the oxidation resistance.

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