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• W4283070372 abstract "Continuous Nb fiber-reinforced TiAl-matrix composites are a potential structural material to satisfy the service requirements in space industry. However, the premature cracking failure is resulted from the brittle reaction products formed at the interface between Nb fiber and TiAl matrix, which accelerates the structural failure of Nbf/TiAl composite. Fortunately, Al2O3 coating could be introduced on the surface of Nb fiber to tackle the problem. In this study, Al2O3 coating was prepared on the surface of Nb fiber by the cathodic plasma electrolytic deposition (CPED) technology, and then the Al2O3-coated Nb fibers were used to reinforce TiAl alloy by using vacuum hot-pressing sintering. Furthermore, the influence of the Al2O3 coating on the interfacial microstructure of Nbf/TiAl composite after hot-pressing sintering and thermal exposure was studied. The results show that deposition voltage plays a key role in the microstructure of Al2O3 coating on the Nb fiber. As the voltage increases from 200 V to 400 V, the thickness, density and Al2O3 content of the coating increase. Meanwhile, the bonding between Nb fiber and Al2O3 coating is better when the deposition voltage exceeds 350 V, and the components of Al2O3-coated Nb fibers prepared from fiber to coating are as follows: Nb/Nb2O5/Nb2O5 + Al2O3/Al2O3. The Al2O3 coating can restrain the formation of the interfacial brittle phases including σ-Nb2Al and α2-Ti3Al during hot-pressing sintering process of Nbf/TiAl composite. In addition, the introduction of Al2O3 coating can reduce the defects in interface, as well as avoid the formation of the crisscrossed and deleterious oxides, which improves interfacial oxidation resistance of the Nbf/TiAl composite." @default.
• W4283070372 created "2022-06-19" @default.
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• W4283070372 date "2022-08-01" @default.
• W4283070372 modified "2023-10-16" @default.
• W4283070372 title "Preparation of Al2O3 coating on Nb fiber and the effect on interfacial microstructure of Nbf/TiAl composite" @default.
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• W4283070372 doi "https://doi.org/10.1016/j.matchar.2022.112061" @default.
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