Abstract
A mixture of the Ti–Al–Sn–Zr matrix powder and SiC particles was used as a raw powder to fabricate an in situ TiC and Ti5Si3 reinforced titanium matrix composites (TMCs) via low energy ball milling–cold press forming–argon-protected sintering. The effects of various content of SiCp on the microstructure, phase composition and high-temperature oxidation behavior of the composites at 750 °C and 850 °C were studied. XRD results show that the oxidation phases were mainly composed of TiO2, Al2O3, SiO2 and α-Ti. According to the SEM images, the cross-sectional morphology of oxidation at 750 °C for 100 h shows that the oxide layer (20.00 μm) in the TMCs with 10.0 vol% SiCp after oxidation was denser and thinner and was 82.13% thinner than that of the matrix (98.00 μm). The parabolic rate constant (kp) of the oxidized composites decreases with the increase of SiCp content at 750 °C and 850 °C. In particular, the composites with 10 vol% SiCp content have smaller kp. All the results show that the addition of SiCp in TMCs can improve high-temperature oxidation resistance.
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This work is supported by the Key Projects of the 13th Five-Year Plan Equipment Pre-research Foundation of the Ministry of Equipment Development of the Central Military Commission of China (No: 6140922010201).
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Xu, X., Liu, Y., Tabie, V. et al. High-temperature oxidation resistance of a Ti–Al–Sn–Zr titanium matrix composites reinforced with in situ TiC and Ti5Si3 fabricated by powder metallurgy. Appl. Phys. A 126, 254 (2020). https://doi.org/10.1007/s00339-020-3431-x
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DOI: https://doi.org/10.1007/s00339-020-3431-x