Influence of high temperature holding on tensile strength of PAN-based carbon fiber reinforced aluminum–magnesium alloy composites fabricated by ultrasonic infiltration method

Yamaguchi, Sho; Mikuni, Jun; Mizoguchi, Ikumi; Matsunaga, Tadashi; Shinozaki, Kenji; Yoshida, Makoto

doi:10.2464/jilm.59.241

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…The polyacrylonitrile (PAN)-based carbon fibers has been reported more reactive than graphitized (pitch based) carbon fibers [Amateau, 1976], indicated also the formation of different morphology of aluminum carbide at interface of PAN-based carbon fiber with aluminum matrix [Kohara and Muto, 1988]. It has been investigated that holding temperature increased, the quantity of Al 4 C 3 increased and tensile strength will be decreased due to corroding of Al 4 C 3 on carbon fibers especially at higher temperatures [Yamaguchi et al, 2009]. The reaction rate of aluminum carbide formation can be reduced by prohibiting of fibers solution in the matrix.…”

Section: Aluminum Carbide Formationsmentioning

confidence: 99%

“…It seems that the lower temperature and short time involved in thixomixing process under intensive shearing prohibited or delayed the undesirable chemical reactions such as fragile aluminum carbide (Al 4 C 3 ) at the interface of fibers and matrix [Yamaguchi et al, 2009]. In additions, the high cooling rate such as quenching in water decreased the interfacial reactant and formation of Al 4 C 3 , remarkably.…”

Section: Dispersion and Distribution Of C S F Into The Matrix After T...mentioning

confidence: 99%

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Characterization of aluminum silicon/short carbon fiber composites fabricated by novel thixomixing method

Akbarzadeh

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The metal matrix composites (MMC) are widely used in different applications and offer high strength-to-weight ratio. In this thesis, it was developed a novel method to fabricate composite material in semi-solid state of aluminum with short carbon fibers (Cs f ). The semi-solid slurry of aluminum silicon alloys represent thixotropic feature when sheared. The intensive shear stress created by high viscosity at mushy zone impacts on uniform distribution and effective dispersion of Cs f into the eutectic without serious physical or chemical damages. For this process, called thixomixing, a prototype mixer was designed to study on A356, A357 and hypereutectic 4047 alloys. The homogenous distribution ofCs f were obtained under optimum conditions: around 48% of solid fraction in slurry and 100 rpm mixing speed. The Cs f was wetted in the molten of eutectic when the primary a-phase was formed. Deposition of silicon or intermetallic compounds on the fiber surface improves wettability aluminum and provides relatively good adherence. The extruded and T6 heat treated Al composites had around 24% improvement of mechanical strength. The fractography analysis illustrated the ductile fracture with some plastic deformation as the results of dimples and some fiber pullout in the fractured surface. Ultra-micro hardness evaluation showed relatively good interfacial bonding after heat treatment. Hypereutectic aluminum alloy (4047)/Cs f composite was used to evaluate the tribological properties. This composite showed low coefficient of friction, when the Cs f acts self-lubricant material. Taguchi method was employed to design the experiments to analyze the effects of the sliding speed, applied load and the volume fraction of Cs f on the tribological properties of thixomixed Al/Cs f composite. The contribution percentage for each parameter was determined by the analysis of variance. The results were indicated that Al/Cs f composite had better tribological properties than matrix alloy due to the carbon as solid-lubricant. The interfacial adherence of matrix/Cs f was shown with no fibers pull out in the tracking area. The presence of coherent and adherent graphite-rich layer on the worn surface was detected. Electrochemical tests were conducted over three alloys, Al/Cs f composites with and without T6 heat treatment. The exposure surfaces were evaluated by SEM in order to find out the localized corrosion and the interfacial adherence. The Cs f , Si particles and iron-intermetallics play as cathode and the matrix as anode to form a galvanic couples. The corrosion current density was decreased for un-reinforced alloys in compare to the composite samples. Los compuestos de matriz metálica (MMC) son ampliamente utilizados en diferentes aplicaciones y ofrecen una alta relación resistencia-peso. En esta tesis se ha desarrollado un nuevo método de conformación en estado semisólido de materiales compuestos en base aluminio con fibras cortas de carbono (Cs f ). Las aleaciones de aluminio en estado semisólido presentan características tixotrópicas cuando son agitadas. La tensión de cizalla provocada por la alta viscosidad repercute en la distribución uniforme y eficaz de las fibras en el constituyente eutéctico, sin daños físicos o químicos graves. Para este proceso, denominado thixomixing, se ha diseñado un prototipo mezclador, con el cual se han estudiado las aleaciones A356, A357 y la aleación hipereutéctica 4047. La óptima distribución del Cs f se ha obtenido en las siguientes condiciones: en torno al 48% de fracción sólida y 100 rpm de velocidad de mezclado. La deposición de silicio o de compuestos intermetálicos en la superficie de la fibra mejora su mojabilidad en el aluminio y proporciona relativamente buena adherencia. Los materiales compuestos base alumino extruidos y sometidos a tratamiento térmico T6 tuvieron una mejoría en torno al 24% de su resistencia mecánica. El análisis fractográfico indica una fractura de carácter d¿uctil, dando como resultado la presencia en la superficie fracturada de hoyuelos y el desprendimiento de algunas fibras. La evaluación mediante ensayos de ultramicrodureza mostró una relativamente buena adherencia fibra-matriz después del tratamiento térmico. Para evaluar las características tribológicas se utilizó como matriz la aleación de aluminio hipereutéctica (4047) reforzada con fibras de carbono. Este material compuesto mostró un bajo coeficiente de fricción debido al carácter lubricante del Cs f . Se ha realizado un diseño de experimentos utilizando el método Taguchi para analizar el efecto de la velocidad de deslizamiento, la carga aplicada y la fracción de volumen de los Cs f en las propiedades tribológicas del material compuesto Al/Cs f . El porcentaje de contribución de cada parámetro se determinó mediante análisis de varianza. Los resultados han indicado que el material compuesto presenta mejores propiedades tribológicas que la matriz debido al carácter lubricante del Cs f . La ausencia de fibras en el canal de desgaste demuestra la buena adherencia entre fibras y matriz. En la superficie del canal de desgaste se observó la presencia de una capa coherente y adherente rica en grafito. Los ensayos electroquímicos se realizaron en las tres aleaciones y en los tres materiales compuestos Al/Cs f , con y sin tratamiento térmico T6. El Cs f , las partículas de Si y los compuestos intermetálicos de hierro actúan como cátodo en una matriz de aluminio anódica, formando pares galvánicos. La densidad de corriente de corrosión es menor en las aleaciones sin reforzar en comparación con los materiales compuestos.

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Section: Aluminum Carbide Formationsmentioning

confidence: 99%

Section: Dispersion and Distribution Of C S F Into The Matrix After T...mentioning

confidence: 99%

Characterization of aluminum silicon/short carbon fiber composites fabricated by novel thixomixing method

Akbarzadeh

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Fabrication Processes for Composites

Nishida

2012

Introduction to Metal Matrix Composites

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Influence of high temperature holding on tensile strength of pitch-based carbon fiber reinforced Al–Mg alloy composites fabricated by ultrasonic infiltration method

Mizoguchi¹,

Yamaguchi²,

Yachi³

et al. 2010

J.JILM

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Carbon fiber reinforced aluminum alloy composites CF/Al composites are expected to be applied to electric power cable due to superior specific strength and specific modulus. It is reported that CF/Al composites form aluminum carbide Al 4 C 3 at the interface between carbon fiber and aluminum alloy. However, in operating condition 300°C, 36 years , the growth of Al 4 C 3 and tensile strength of CF/Al composites have not been clarified. In this study, at first, pitch-based CF XN-60 /Al composites are fabricated with ultrasonic infiltration method and held at 300, 450, 500°C for a given length of time. Secondary, influence of holding temperature on the quantity of Al 4 C 3 was investigated. Thirdly, relationship between the quantity of Al 4 C 3 and tensile strength of CF/Al composites was examined. As holding temperature increased, the quantity of Al 4 C 3 increased and tensile strength decreased. Reaction kinetics calculation indicated that remaining strength versus theoretical strength ROM of the CF/Al composites, held at 300°C for 36 years, was 0.81. That is, it should be better for applying the pitch-based CF/Al composites to electric power cable than the PAN-based CF/Al composites.

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Influence of high temperature holding on tensile strength of PAN-based carbon fiber reinforced aluminum–magnesium alloy composites fabricated by ultrasonic infiltration method

Cited by 3 publications

References 15 publications

Characterization of aluminum silicon/short carbon fiber composites fabricated by novel thixomixing method

Characterization of aluminum silicon/short carbon fiber composites fabricated by novel thixomixing method

Fabrication Processes for Composites

Influence of high temperature holding on tensile strength of pitch-based carbon fiber reinforced Al–Mg alloy composites fabricated by ultrasonic infiltration method

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