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Silicon carbide fiber-reinforced titanium matrix(SiCf/Ti) composites offer high specific strength, stiffness, and resistance to high temperatures, creep, and fatigue, making them suitable for structural components below 800 ℃. The interface is critical for load transfer, with interfacial shear strength being a key performance indicator. Single-fiber push-out tests, analyzed via analytical or finite element(FE) methods, are standard for determining interfacial shear strength. However, characterization limitations typically restrict these tests to room temperature, despite the composites´ operation in medium-to-high temperature environments. Property changes in the fiber, matrix, and interface, along with residual stress redistribution at elevated temperatures, likely alter interfacial mechanical behavior and failure mechanisms. This work employed an in-situ heating stage to examine the interfacial mechanical response of SiCf/TC17 composites from 25 to 600 ℃, complemented by an FE model assessing temperature-dependent interfacial shear strength and failure. Single-fiber push-out load-displacement curves across temperatures consistently showed stages: elastic and plastic deformation, interfacial sliding, and indenter-matrix contact. Interfacial debonding strength, derived from the curve peak, measured 90.0 MPa at 25 ℃. It decreased slightly at 300 ℃, then declined rapidly to 28.1 MPa at 600 ℃. Temperature significantly impacted push-out performance via two competing factors: decreasing shear residual stress tended to increase interfacial debonding strength, while reduced interfacial shear strength and radial residual stress decreased it. Between 25 and 300 ℃, these influences balanced, resulting in minimal interfacial debonding strength change. Above 300 ℃, the decline in material shear strength and radial residual stress dominated, causing the sharp interfacial debonding strength reduction. Residual stress evolution with temperature was analyzed, assuming initial cooling from 900 ℃. The higher thermal expansion coefficient of TC17 matrix compared to SiC fiber led to compressive radial stress in both components upon cooling, decreasing in magnitude from the interior outward. Axially and circumferentially, the fiber experienced compression while the matrix was under tension. Stress relaxation caused axial matrix contraction to exceed fiber contraction, generating shear residual stresses symmetrically distributed around the sample midsection at the interface. Both radial and shear thermal residual stresses critically influenced interfacial debonding strength. At 25 ℃, radial residual stress at the matrix/C coating interface was 261.6 MPa, decreasing progressively to 63.1 MPa at 600 ℃. Concurrently, maximum interfacial shear stress dropped from 272.0 MPa(25 ℃) to 71.3 MPa(600 ℃). An FE model based on cohesive zone theory incorporated interfacial shear strength, friction, and residual stress. Simulations using varied interfacial shear strengths and temperatures generated load-displacement curves. The simulated push-out load decreased after its peak, indicating complete interfacial debonding, with subsequent resistance governed by sliding friction. This frictional force decreased with rising temperature, driven by reducing residual stresses and independent of interfacial shear strength. Higher interfacial shear strength increased the simulated peak push-out load. The interfacial shear strength yielding a simulated peak load matching the experimental value was taken as the actual material property. This method determined the interfacial shear strength as 536 MPa at 25 ℃. It decreased slightly by 300 ℃, then rapidly declined to 196 MPa at 600 ℃. The radial compressive residual stress in SiCf/TC17 composites remained relatively low and was insufficient to damage C coating. Consequently, interfacial failure consistently initiated at the interface between C coating and the brittle interfacial reaction layer, specifically at the specimen´s support end. This location arose because the direction of shear residual stress away from the loading end aligned with the shear stress from the push-out load. As the push-out load increased, cracks propagated from the support end towards the loading end, culminating in complete interfacial failure. In summary, interfacial debonding strength, residual stresses(both radial and shear), and interfacial shear strength in SiCf/TC17 composites decreased substantially as temperature rises from 25 to 600 ℃. Interfacial failure consistently initiated at C coating/reaction layer interface at the support end across all tested temperatures.
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Basic Information:
DOI：10.13373/j.cnki.cjrm.XY25050020
China Classification Code:TB33
Citation Information:
[1]Wang Minjuan,Yang Guang,Sun Guangyao ,et al.Interfacial Mechanical Behavior of SiC_f/TC17 Composites under Different Temperature[J].Chinese Journal of Rare Metals,2026,50(05):712-724.DOI:10.13373/j.cnki.cjrm.XY25050020.
Fund Information:
先进复合材料重点实验室开放基金项目(JCKYS2023213002)资助
2026-05-15
2026-05-15