Crack initiation and growth toughness of an aluminum metal-matrix composite

Manoharan, M.; Lewandowski, John J.

doi:10.1016/0956-7151(90)90155-a

Cited by 232 publications

(75 citation statements)

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“…Estas mejoras, unidas a su facilidad de procesado y menor coste, respecto a los MC metálicos reforzados con fibra larga, hacen que estos materiales sean muy prometedores en las industrias del automóvil y aeroespacial (1-3). Sin embargo, en las aleaciones de la serie 7XXX no se ha conseguido mejorar sus propiedades mecá-nicas añadiéndoles reforzantes de SiC (4)(5)(6)(7)(8)(9)(10)(11)(12). Por el contrario, se produce un cierto deterioro de estas propiedades.…”

Section: Introductionunclassified

Influencia del tamaño de partícula de polvo sobre las propiedades mecánicas de la aleación PM Al7075 reforzada con SiCp

Torralba¹,

Adeva²,

Lieblich³

et al. 1998

REVMETAL

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A. García-Escoriar y G. González-Doncer y Resumen Se ha estudiado la influencia del tamaño de partícula de polvo de la aleación de aluminio 7075, obtenido en condiciones de solidificación rápida (SR) por atomización con argón a alta presión, sobre las propiedades mecánicas a temperatura ambiente de un material compuesto 7075-15 % vol. SiCp. Para preparar el material compuesto, se utilizaron tres tamaños distintos de partículas de polvo de la aleación: < 50 |xm, 50-100 (xm y 100-200 fjim. Estas fracciones se mezclaron en un molino de bolas con un 15 % vol. de partículas de SiC, < 5 [xm, y luego.se extruyeron en caliente. Las mejores propiedades del compuesto se obtienen cuando se utiliza el tamaño más pequeño. En este caso, se produce una clara mejoría de las propiedades mecánicas respecto del mismo material sin reforzar y obtenido por el mismo procedimiento, excepto para la ductilidad. Esta mejora se atribuye principalmente a una dispersión más homogénea de las partículas reforzantes de SiC.Palabras clave: Materiales compuestos. A17075-SiCp. Tamaño de partícula. Solidificación rápida. Molino de bolas. Influence of powder particle size on the mechanical properties of SiCp reinforced A.A.7075Abstract The influence of powder particle size of 7075 aluminum on the room temperature mechanical properties of 7075-15 vol. % SiCp has been studied. The aluminum powder was obtained by argón atomization under rapid solidification conditions. Composite materials were prepared from three different particle sizes, namely; < 50 ¿Jim, 50-100 jxm and 100-200 |mm. These powders were blended with 15 vol % of SiC particles < 5 |xm in size by ball milling and then, hot extruded. The best properties of the resulting composites correspond to the material prepared from the smallest particle size. For this case, a clear improvement of the mechanical properties, except for ductility, is obtained. This is attributed to a more homogeneous distribution of the reinforcing SiC particles.

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Section: Introductionunclassified

Influencia del tamaño de partícula de polvo sobre las propiedades mecánicas de la aleación PM Al7075 reforzada con SiCp

Torralba¹,

Adeva²,

Lieblich³

et al. 1998

REVMETAL

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“…[3][4][5][6][7][8][9] They found that the fracture modes in the SiC P /Al alloy composites mainly included the failure of their matrix, the fracture of interfaces between the particles and matrix, and the fracture of particles themselves. All their inspections, however, were made on the post-fractured specimens, therefore unable to disclose the detailed fracture processes during loading.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] The degradation in fracture toughness is influenced by many factors, such as particle size, aspect ratio, volume fraction, distribution and strength of the particles, strength of the interface between the particles and matrix, and properties of their matrix alloys. [3][4][5][6][7][8] It has been recognized that an increase in volume fraction of SiC p leads to a decrease in fracture toughness of the composite, 3,[5][6][7] but an increase in SiC particle size causes an increase in fracture toughness. 8) In the previously reported work, 3,[5][6][7][8] the studied SiC particle sizes were larger than 2 mm.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8] It has been recognized that an increase in volume fraction of SiC p leads to a decrease in fracture toughness of the composite, 3,[5][6][7] but an increase in SiC particle size causes an increase in fracture toughness. 8) In the previously reported work, 3,[5][6][7][8] the studied SiC particle sizes were larger than 2 mm. More recently, however, a result in our research 4) indicated that the fracture toughness (both crack initiation toughness and propagation toughness) of the composite reinforced with much finer SiC particles (0.6 mm) was obviously higher than that of the composite reinforced with coarse particles (9.5 mm) although the volume fraction of the reinforcements was kept the same.…”

Section: Introductionmentioning

confidence: 99%

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<I>In-situ</I> Observations of Fracture Processes in 0.6 μm and 9.5 μm SiC<SUB>P</SUB>/6061Al Composites

et al. 2005

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In-situ SEM observations of fracture processes in two 6061Al alloy composites reinforced with coarse and fine SiC particles, respectively, were carried out to clarify their fracture mechanisms. It was found that in the coarse particle reinforced composite, voids were formed in the matrix around SiC particles ahead of the main crack tip, then coalesced with each other, and finally connected with the main crack tip, causing propagation of the main crack. However, in the fine particle reinforced composite, multiple micro-cracks were formed at the boundaries between SiC particle clusters and surrounding matrix or within the clusters, then connected with each other, and finally joined with the main crack tip, leading to crack branching and growth of the main crack. Crack branching, multiple cracking and crack deflection were proposed to contribute to the enhanced fracture toughness in the fine particle reinforced composite compared with the coarse particle reinforced composite.

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“…In brief, the ceramic particles cause a strong acceleration of internal damage build-up, and damage is highly localised in front of the crack tip, thus forming a distinct fracture process zone [8][9][10][11][12][13][14][15][16][17]. Micromechanisms of fracture operating in this process zone include: (i) particle fracture, (ii) debonding or cracking along the reinforcement/matrix interface, (iii) failure in the matrix by microvoid nucleation, growth and coalescence, and (iv) failure in the matrix by shear.…”

Section: Introductionmentioning

confidence: 99%

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

Miserez

2004

Acta Materialia

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Model composites of pure Al reinforced with 50% ceramic particles are produced by infiltration. The composite fracture energy is measured by J -integral testing. Marked R-curve behaviour is found. The J-R curves exhibit a break in their slope at a well-defined point. This point is shown to denote the onset of macroscopic crack propagation and is used to assess the composite toughness.Toughness reaches values as high as 40 MPa ffiffiffiffi m p . Quantitative metallography and stereoscopic reconstructions of fracture surfaces are used to estimate the local work of fracture in the process zone. The measured (total) fracture energy is about ten times the estimated local fracture energy, for all composites. The main contribution to their total fracture energy is thus from plastic dissipation around the crack-tip; however, the toughness is still dictated by the local fracture energy. This study hence experimentally substantiates the ''valve'' concept in fracture mechanics.

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Crack initiation and growth toughness of an aluminum metal-matrix composite

Cited by 232 publications

References 10 publications

Influencia del tamaño de partícula de polvo sobre las propiedades mecánicas de la aleación PM Al7075 reforzada con SiCp

Influencia del tamaño de partícula de polvo sobre las propiedades mecánicas de la aleación PM Al7075 reforzada con SiCp

<I>In-situ</I> Observations of Fracture Processes in 0.6 μm and 9.5 μm SiC<SUB>P</SUB>/6061Al Composites

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

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Crack initiation and growth toughness of an aluminum metal-matrix composite

Cited by 232 publications

References 10 publications

Influencia del tamaño de partícula de polvo sobre las propiedades mecánicas de la aleación PM Al7075 reforzada con SiCp

Influencia del tamaño de partícula de polvo sobre las propiedades mecánicas de la aleación PM Al7075 reforzada con SiCp

<I>In-situ</I> Observations of Fracture Processes in 0.6 &mu;m and 9.5 &mu;m SiC<SUB>P</SUB>/6061Al Composites

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

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<I>In-situ</I> Observations of Fracture Processes in 0.6 μm and 9.5 μm SiC<SUB>P</SUB>/6061Al Composites