Effect of Interfacial Reaction on High Temperature Properties of Fe-Cr-Si Fiber Reinforced AC8A Aluminum Composites

Metallic fibers (Fe-Cr-Si) with an excellent high temperature strength are expected to be use as a reinforced material of the engine piston head. However, the high reactivity of Al with most metals has disturbed the use of metallic fibers in aluminum composites until now. In this study, the influence of the reaction products at the fiber/matrix interface on high temperature properties of the composites was investigated by different solution treatment conditions. It is found that hardness and strength increase with an increase the solution treatment temperature (Tst). Reaction products (Al-Fe intermetallic compounds) resulting from solution treatments were formed along the fiber/matrix interface at 773 K or higher. The composites without interfacial reaction products (Tst=763 K) showed excellent rotating-bending fatigue life at 573 K. The fatigue crack propagation in this composite occurred at the necking region of the metal fiber because no cracks were observed in the interfacial reaction products.

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Effects of Thermal Cycling on Properties of Carbon Fiber/Aluminum Composites

Journal of Engineering Materials and Technology ◽

10.1115/1.3226035 ◽

1988 ◽

Vol 110 (2) ◽

pp. 89-95 ◽

Cited By ~ 5

Author(s):

Tetsuyuki Kyono ◽

Etsuro Kuroda ◽

Atsushi Kitamura ◽

Tsutomu Mori ◽

Minoru Taya

Keyword(s):

Mechanical Properties ◽

Carbon Fiber ◽

Thermal Cycling ◽

Degradation Mechanism ◽

Matrix Interface ◽

Aluminum Composites ◽

Longitudinal Tensile Strength ◽

Casting Technique ◽

Fiber Matrix Interface ◽

Fiber Matrix

Effects of thermal cycling on mechanical properties such as longitudinal tensile strength, interlaminar shear strength and work of fracture of carbon fiber/aluminum composites have been investigated. The composite specimens fabricated by a squeeze casting technique were thermally cycled in fluidized baths between room temperature and various temperatures (250, 300, and 350° C) for up to 1000 cycles. The cross sections and fracture surfaces were examined to clarify the degradation mechanism. Significant degradation of the mechanical properties by thermal cycling was observed in untreated carbon fiber/aluminum composites whereas much less degradation in surface treated carbon fiber/aluminum composites. Microscopic observations and short beam shear tests have indicated that the degradation of mechanical properties is caused by debonding at the fiber/matrix interface. The fiber/matrix interface for surface treated fiber was more resistant to debonding. It is concluded that thermal cycling damage of carbon fiber/aluminum composites can be minimized by increasing their fiber/matrix bond strengths.

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The temperature effect on the inter-laminar shear properties and failure mechanism of 3D orthogonal woven composites

Textile Research Journal ◽

10.1177/0040517520927009 ◽

2020 ◽

Vol 90 (23-24) ◽

pp. 2806-2817

Author(s):

Juanzi Li ◽

Wei Fan ◽

Tao Liu ◽

Linjia Yuan ◽

Lili Xue ◽

...

Keyword(s):

High Temperature ◽

Failure Mechanism ◽

Failure Modes ◽

Woven Composites ◽

Interface Properties ◽

Matrix Interface ◽

Fiber Matrix Interface ◽

Fiber Matrix ◽

3D Orthogonal Woven ◽

Laminar Shear

Recent increases in the use of carbon fiber reinforced plastics, especially for high-temperature applications, has induced new challenges in evaluating their mechanical properties. The effects of temperature on the shear performance of 3-dimensional orthogonal and 2-dimensional plain woven composites were compared in this study through double-notch shear tests. A scanning electron microscope was employed to investigate the fiber/matrix interface properties to reveal the failure characteristics. The results showed that temperature had a visible impact on the inter-laminar shear strength (ILSS), deformation modes, and failure mechanism. The ILSS decreased as temperature increased, which was caused by the degradation of the matrix properties and fiber/matrix interface properties at high temperature. A finite element model was established to analyze the transient deformation process and the damage mechanism of the 3D orthogonal woven composite. This indicated that Z-binder yarns could improve the delamination resistance of 3D orthogonal woven composites, especially under high temperatures. The changes in failure modes of the 3D orthogonal woven composites was put down to thermal softening of the epoxy resin caused by high temperature and the undulation of the yarns.

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Interface Study of Short Mullite Fiber Reinforced Al-Cu-Si Alloy Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.150-151.1574 ◽

2010 ◽

Vol 150-151 ◽

pp. 1574-1579

Author(s):

Jian Ping Long ◽

Wei Li ◽

Shan Hua Chen ◽

Jin Hui Lin ◽

Ying Zeng

Keyword(s):

Electron Microscope ◽

Transmission Electron Microscope ◽

Interfacial Microstructure ◽

Matrix Interface ◽

Fiber Reinforced ◽

Reaction Products ◽

Transmission Electron ◽

Mullite Fiber ◽

Fiber Matrix Interface ◽

Fiber Matrix

Short mullite fiber reinforced Al-Cu-Si alloy composites were produced by squeeze casting. The interfacial microstructure and microchemistry of the testing composites were studied by means of X-ray diffraction (XRD), transmission electron microscope (TEM) and energy disperse spectrum (EDS) equipped with TEM, respectively. It is shown that chopped mullite fibers in the composites are polycrystalline in structure composed of many fine mullite crystal particles which are orthorhombic in structure with lattice constants of a = 0.749 nm, b = 0.927 nm and c = 0.581 nm based on electron diffraction (ED) analysis and high resolution transmission electron microscope (HRTEM). There are much denser dislocations in the near vicinity of both fiber/matrix interface and silicon/matrix interface. But interfacial reaction products at fiber/matrix interface in (3Al2O32SiO2)/Al-4.0Cu-5.0Si composites have not been observed yet.

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Effect of Interface Coating on High Temperature Mechanical Properties of SiC–SiC Composite Using Domestic Hi–Nicalon Type SiC Fibers

Coatings ◽

10.3390/coatings10050477 ◽

2020 ◽

Vol 10 (5) ◽

pp. 477 ◽

Cited By ~ 1

Author(s):

Enze Jin ◽

Wenting Sun ◽

Hongrui Liu ◽

Kun Wu ◽

Denghao Ma ◽

...

Keyword(s):

Tensile Strength ◽

High Temperature ◽

Theoretical Analysis ◽

Fracture Mode ◽

Radial Stress ◽

Matrix Interface ◽

Preparation Temperature ◽

Pull Out ◽

Fiber Matrix Interface ◽

Fiber Matrix

Here we show that when the temperature exceeded 1200 °C, the tensile strength drops sharply with change of fracture mode from fiber pull-out to fiber-break. Theoretical analysis indicates that the reduction of tensile strength and change of fracture mode is due to the variation of residual radial stress on the fiber–matrix interface coating. When the temperature exceeds the preparation temperature of the composites, the residual radial stress on the fiber–matrix interface coating changes from tensile to compressive, leading to the increase of the interface strength with increasing temperature. The fracture behavior of SiC–SiC composites changes from ductile to brittle when the strength of fiber–matrix interface coating exceeds the critical value. Theoretical analysis predicts that the high temperature tensile strength can increase with a decrease in fiber–matrix interface thickness, which is verified by experiments.

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Effect of Fiber/Matrix Interface Modification on Basalt Fiber Reinforced Geopolymer Composites

Recent Progress in Materials ◽

10.21926/rpm.2101008 ◽

2020 ◽

Vol 3 (1) ◽

pp. 1-1

Author(s):

Kohl Jacobson ◽

◽

Sam Strassler ◽

Courtney Spalt ◽

Sara Henry ◽

...

Keyword(s):

High Temperature ◽

Basalt Fiber ◽

Matrix Interface ◽

Fiber Reinforced ◽

Geopolymer Matrix ◽

Structural Applications ◽

Carbon Coated ◽

Fiber Matrix Interface ◽

Fiber Matrix ◽

Geopolymer Composites

Continuous fiber reinforced geopolymer matrix composites offer the potential for use in structural applications at temperatures up to 700°C, while enabling the manufacture at temperatures below 100°C. Studies have investigated a variety of high temperature structural fiber reinforcements, including carbon, SiC and Al2O3. While there has been active research into various grades of Al2O3 fibers, SiC is most commonly used for high temperature reinforcement of geopolymers in oxidizing environments. Both families of reinforcement are relatively expensive and are capable of use temperatures which exceed those of the geopolymer. Basalt fibers have the potential to be a good match for the geopolymer matrix, both in terms of upper use temperature and cost. In this study, Basalt fabric reinforced geopolymer composites were prepared with fibers having three different surface conditions, as-received (silane sized), cleaned, and carbon-coated, to investigate the effect of fiber-matrix interface on the mechanical properties. All specimens were fabricated, cured at 80°C and conditioned at 250°C for 5 hours to create the baseline specimens. More than half of the 70 specimens manufactured were exposed to an additional 5 hours at 650°C. Flexural strength, strain-to-failure and modulus were determined at ambient temperature via 4-point bend testing. The as-received and cleaned specimens showed moduli approaching theoretical predictions, indicating a strong interfacial bond, resulting in brittle failures at low loads. The carbon coating resulted in a three-fold increase in strength after the 250°C conditioning and retained a strength higher than the other specimens, even after the 650°C treatment. This strength increase did come with a reduced modulus, suggesting that the stress transfer between fiber and matrix in the carbon-coated basalt fiber reinforced geopolymer composites had also been reduced. While the carbonaceous interphase was not expected to be stable at the higher temperatures in an oxidizing environment, the results do indicate that significant Basalt fiber reinforced geopolymer strength gains are possible through the implementation of a tailored fiber/matrix interface as a crack blunting mechanism.

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