Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites
1
National Center of Novel Materials for International Research, Tsinghua University, Beijing 100084, China
2
Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
3
Beijing Engineering Research Center of Graphene and Application, Beijing 100095, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Materials 2020, 13(15), 3358; https://doi.org/10.3390/ma13153358
Received: 26 June 2020
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Revised: 25 July 2020
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Accepted: 27 July 2020
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Published: 29 July 2020
(This article belongs to the Special Issue Design, Properties and Processing of Novel Composites)
In this study, graphene-oxide (GO)-reinforced Ti–Al–Sn–Zr–Mo–Nb–Si high-temperature titanium-alloy-matrix composites were fabricated by powder metallurgy. The mixed powders with well-dispersed GO sheets were obtained by temperature-controlled solution mixing, in which GO sheets adsorb on the surface of titanium alloy particles. Vacuum deoxygenating was applied to remove the oxygen-containing groups in GO, in order to reduce the introduction of oxygen. The compact composites with refined equiaxed and lamellar α phase structures were prepared by hot isostatic pressing (HIP). The results show that in-situ TiC layers form on the surface of GO and GO promotes the precipitation of hexagonal (TiZr)6Si3 particles. The composites exhibit significant improvement in strength and microhardness. The room-temperature tensile strength, yield strength and microhardness of the composite added with 0.3 wt% GO are 9%, 15% and 27% higher than the matrix titanium alloy without GO, respectively, and the tensile strength and yield strength at 600 °C are 3% and 21% higher than the matrix alloy. The quantitative analysis indicates that the main strengthening mechanisms are load transfer strengthening, grain refinement and (TiZr)6Si3 second phase strengthening, which accounted for 48%, 30% and 16% of the improvement of room-temperature yield strength, respectively.
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Keywords:
titanium-matrix composite; graphene oxide; high-temperature titanium alloy; microstructure; tensile properties; silicide
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MDPI and ACS Style
Chen, H.; Mi, G.; Li, P.; Huang, X.; Cao, C. Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites. Materials 2020, 13, 3358. https://doi.org/10.3390/ma13153358
AMA Style
Chen H, Mi G, Li P, Huang X, Cao C. Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites. Materials. 2020; 13(15):3358. https://doi.org/10.3390/ma13153358
Chicago/Turabian StyleChen, Hang, Guangbao Mi, Peijie Li, Xu Huang, and Chunxiao Cao. 2020. "Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites" Materials 13, no. 15: 3358. https://doi.org/10.3390/ma13153358
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