Effect of C/Mo duplex coating on the interface and tensile strength of SiCf/Ti-21Al-29Nb composites

Luo, X., Wang, Y. Q., Yang, Y. Q., Zhang, M. X., Huang, B., Liu, S. and Jin, N. (2017) Effect of C/Mo duplex coating on the interface and tensile strength of SiCf/Ti-21Al-29Nb composites. Journal of Alloys and Compounds, 721 653-660. doi:10.1016/j.jallcom.2017.06.039

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Author Luo, X.
Wang, Y. Q.
Yang, Y. Q.
Zhang, M. X.
Huang, B.
Liu, S.
Jin, N.
Title Effect of C/Mo duplex coating on the interface and tensile strength of SiCf/Ti-21Al-29Nb composites
Formatted title
Effect of C/Mo duplex coating on the interface and tensile strength of SiCf/Ti-21Al-29Nb composites
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
1873-4669
Publication date 2017-06-07
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2017.06.039
Open Access Status File (Author Post-print)
Volume 721
Start page 653
End page 660
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract SiC fiber-reinforced Ti-21Al-29Nb matrix composites with either C and C/Mo duplex coatings were prepared by the foil-fiber-foil (FFF) method, in order to comparatively study the effects of C/Mo duplex coatings on the interface and mechanical properties of the composites. The longitudinal tensile strength of the as-prepared composites was measured at room temperature. In order to study the interfacial thermal stability and microstructure evolution characteristics of the composites, vacuum thermal exposures of the composites were carried out at 800, 900 or 940 °C for different durations. The interfacial microstructures of the as-prepared and thermally-exposed composites were investigated by means of scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). The results indicate that the C/Mo duplex coating does not only have better thermal stability, but also can further slow down the interfacial reaction of the composites in comparison with the C single coating. The diffusion of a small amount of Mo atoms made the matrix close to the interface have better plasticity, so the tensile strength of the composites can be further improved. The interface of the composite with the C/Mo duplex coating was nearly intact after the 940 °C/50 h thermal exposure while that of the composite with the C single coating was not intact, as the C/Mo duplex coating can better relax the thermal residual stresses than the C single coating.
Keyword C/Mo duplex coating
Interfacial reaction
SiCf/Ti-21Al-29Nb composite
Tensile strength
Thermal stability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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