Formation of interfacial reaction products in SCS-6 SiC/Ti2AlNb composites

Yang, Yanqing; Zhu, Yanchao; Ma, Zhijun; Chen, Y.

doi:10.1016/j.scriptamat.2004.05.020

Cited by 40 publications

(12 citation statements)

References 14 publications

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“…4(c)). However, Ti x Cu y is not as stable as TiC from the viewpoint of thermodynamics: the standard Gibbs free energies of formation ( f G Ο Δ ) for TiC at 527°C is about −175 kJ⋅mol −1 [12], for Cu 4 Ti, CuTi, and CuTi 2 at 500°C are −22.6, −18.8, and −26.3 kJ⋅mol −1 , respectively [13]. Therefore, f G Ο Δ of TiC is the lowest in comparison with these data.…”

Section: Discussion On the Reaction Process Of The C/ti/cu Interfacementioning

confidence: 99%

“…SiC f /Cu composites have also been developed for over 10 years by the Naval Surface Weapons Center Program (12) in the USA, and about 85% of the strength (estimated in terms of the rule of mixtures) has been achieved at a fiber volume fraction of 20%-33% [5]. However, weak fiber/matrix interfacial bonding strength results in inadequate mechanical properties as there is neither interfacial reaction nor mutual wetting between the SiC fiber and copper matrix.…”

Section: Introductionmentioning

confidence: 99%

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C/Ti/Cu interfacial reaction in SiCf/Cu composites

Yang

Wang

et al. 2011

Rare Metals

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Continuous SiC fiber reinforced copper matrix (SiC f /Cu) composites were prepared by fiber coating method, and Ti6Al4V interlayer was introduced as an interfacial modification coating to improve the interfacial bonding strength. The interfacial reaction characteristics were investigated by transmission electron microscopy (TEM). The results show that nearly all the titanium atoms reacted with the carbon coating of SiC fibers to form two layers of TiC. Also, a thin copper layer that is sandwiched between these two layers was detected. No Ti-Cu interfacial reaction product was observed. The formation process of the interfacial reaction along with its mechanism was discussed.

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Section: Discussion On the Reaction Process Of The C/ti/cu Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

C/Ti/Cu interfacial reaction in SiCf/Cu composites

Yang

Wang

et al. 2011

Rare Metals

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“…Mo and Nb have similar crystal structure, so Mo atoms replace the lattice positions of Nb atoms to complete diffusion process [23]. However, as the bond strength of the intermetallic compound is strong [4], it is hard for Mo atoms to replace Nb atoms. This is also the main reason for Mo atoms to diffuse more easily in the Ti6Al4V matrix [15] than in Ti-21Al-29Nb matrix.…”

Section: Element Distribution Characteristics Of the As-prepared Compmentioning

confidence: 99%

“…Ti 2 AlNb-based composites reinforced by SiC monofilaments have received great attention for advanced light-weight aerospace applications as Ti 2 AlNb-based alloys with an ordered orthorhombic structure exhibit a very attractive combination of room temperature elongation-to-failure and high temperature strength suitable for matrix materials [3][4][5]. However, the mismatch between the coefficients of thermal expansion of the fiber and the matrix as well as the severe fiber/matrix interfacial reactions may result in degradation of the mechanical properties of the composites [6,7].…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Yang

et al. 2017

Journal of Alloys and Compounds

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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 /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.

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“…There is a series of experimental data about composition of transient layer generated under synthesis conditions [5], and thermodynamical calculations of the parameters of chemical reactions that are feasible in the diffusion zone [6]. Though, the dynamics of transient layer formation, synthesis stages, the dependence of reaction course on technology or labor conditions, and the influence of initial concentrations of substances on final composition remain unstudied.…”

Section: Intermediate Layer Formation Between Inclusion and Matrix Dumentioning

confidence: 99%

Intermediate layer formation between inclusion and matrix during synthesis of unidirectional fibrous composite

Knyazeva¹,

Kruykova²,

Lurie³

et al. 2014

AIP Conference Proceedings

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The problem of transient layer formation in given composition between inclusions and matrix can be solved using mathematical modeling. This paper suggests a suitable model taking into account multi staging of chemical conversion. Numerical realization of this model allows studying the dynamics of transient layer formation at varying temperature and pressure. As a result, the phase structure and thickness of a transient zone depending on synthesis conditions are obtained

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Formation of interfacial reaction products in SCS-6 SiC/Ti2AlNb composites

Cited by 40 publications

References 14 publications

C/Ti/Cu interfacial reaction in SiCf/Cu composites

C/Ti/Cu interfacial reaction in SiCf/Cu composites

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

Intermediate layer formation between inclusion and matrix during synthesis of unidirectional fibrous composite

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