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

Qing-dong Qin; Jin-bo Qu; Yong-e Hu; Yu-jiao Wu; Xiang-dong Su

doi:10.1007/s12613-018-1681-9

Volume 25 Issue 11

Nov. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(11): 1286-1293

Qing-dong Qin, Jin-bo Qu, Yong-e Hu, Yu-jiao Wu, and Xiang-dong Su, Microstructural characterization and oxidation resistance of multicomponent equiatomic CoCrCuFeNi-TiO high-entropy alloy, Int. J. Miner. Metall. Mater., 25(2018), No. 11, pp. 1286-1293. https://doi.org/10.1007/s12613-018-1681-9

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Qing-dong Qin, Jin-bo Qu, Yong-e Hu, Yu-jiao Wu, and Xiang-dong Su, Microstructural characterization and oxidation resistance of multicomponent equiatomic CoCrCuFeNi-TiO high-entropy alloy, Int. J. Miner. Metall. Mater., 25(2018), No. 11, pp. 1286-1293. https://doi.org/10.1007/s12613-018-1681-9

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Research Article

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

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Corresponding author:
Qing-dong Qin E-mail: qin8370@126.com
Received: 22 February 2018; Revised: 6 April 2018; Accepted: 13 April 2018

Abstract

Abstract

CoCrCuFeNi-TiO was prepared by arc melting of the pure elements and Ti₂CO powder under an Ar atmosphere. Both CoCrCuFeNi 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 CoCrCuFeNi. However, as the TiO content increases further, a corresponding decrease is observed in the oxidation resistance.
- multicomponent equiatomic;
- high-entropy alloys;
- microstructure;
- oxidation resistance

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