Cavity formation during tensile straining of particulate and short fibre metal matrix composites

Whitehouse, A.F.; Clyne, T.W.

doi:10.1016/0956-7151(93)90189-y

Cited by 127 publications

(41 citation statements)

References 17 publications

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“…Previous studies of particulate metal matrix composites in tension have shown that the accumulation of damage can be characterized by the change in density of the material with strain [46,62,63] and that this change can be related to other damage measures such as change in stiffness [46,64,65]. In compression, since particle fracture is predominately perpendicular to the principal tensile axes, the segments of the broken particle can move apart following the deformation of the material around them, as shown schematically in Fig.…”

Section: Damagementioning

confidence: 99%

Quasistatic and dynamic compression of aluminum-oxide particle reinforced pure aluminum

Marchi

Cao

Kouzeli

et al. 2002

Materials Science and Engineering: A

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Pure aluminum matrix composites reinforced with 40 Á/55 vol.% Al 2 O 3 particles of various sizes (5, 10, 29, and 58 mm) are produced by gas-pressure infiltration. Comparison of compressive flow stresses of these composites at quasistatic and dynamic strain rates shows that, in accord with the literature, the increase in flow stress of dynamically compressed composites results from the sensitivity of the matrix to strain rate. The accumulation of damage in the composites is quantified through high-precision density measurements. Damage accumulates primarily as a function of strain due to particle cracking followed by separation of the broken-particle segments and, to a lesser extent, by matrix cavitation. Composites reinforced by smaller particles have a higher flow stress, lower strain-rate sensitivity, and accumulate less damage, while a greater concentration of reinforcement increases the flow stress, strain-rate sensitivity, and the rate of damage accumulation. #

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Section: Damagementioning

confidence: 99%

Quasistatic and dynamic compression of aluminum-oxide particle reinforced pure aluminum

Marchi

Cao

Kouzeli

et al. 2002

Materials Science and Engineering: A

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“…Experimental studies have determined that the predominant damage micromechanisms leading to this degradation are: (i) reinforcement fracture, (ii) void nucleation and growth in the matrix and (iii) debonding along the matrix/reinforcement interface [1][2][3][4][5][6][7][8][9][10][11][12]. With respect to the influence of basic microstructural parameters on the rate of damage accumulation, it has been shown that increasing reinforcement size, angularity, aspect ratio, volume fraction, inhomogeneity in spatial distribution, interface degradation and matrix strength increases the level of damage in particle reinforced MMCs [13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Quantification of microdamage phenomena during tensile straining of high volume fraction particle reinforced aluminium

et al. 2001

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Abstract-Particle reinforced composites are produced by infiltrating ceramic particle beds with 99.99% Al. Resulting materials feature a relatively high volume fraction (40-55 vol. pct) of homogeneously distributed reinforcement. The evolution of damage during tensile straining of these composites is monitored using two indirect methods; namely by tracking changes in density and in Young's modulus. Identification and quantification of the active damage mechanisms is conducted on polished sections of failed tensile specimens; particle fracture and void formation in the matrix are the predominant damage micromechanisms in these materials. The damage parameter derived from the change in density at a given strain is found to be one to two orders of magnitude smaller than the parameter based on changes in Young's modulus. A simple micromechanical analysis inspired by the observed damage micromechanisms is used to correlate the two indirect measurements of damage. The predictions of this analysis are in good agreement with experiment.

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“…These mismatches can induce large stresses within the inclusions or at the matrix-inclusion interfaces [10,11]. A number of failure modes in MMCs have been reported in the past, including matrix/particle debonding [12][13][14][15][16], particle cracking [11,[17][18][19][20][21][22][23][24] and ductile failure in the matrix [25,26]. The elastic modulus, flow stress and ductility of MMCs are found to drop significantly as soon as such failures occur [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Flow stress of biomorphous metal–matrix composites

JI¹,

GAO²,

WANG³

2004

Materials Science and Engineering A

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For metal-matrix composites (MMCs), interfacial debonding between the ductile matrix and the reinforcing hard inclusions is an important failure mode. A fundamental approach to improving the properties of MMCs is to optimize their microstructure to achieve maximum strength and toughness. Here, we investigate the flow stress of a MMC with a nanoscale microstructure similar to that of bone. Such a 'biomorphous' MMC would be made of staggered hard and slender nanoparticles embedded in a ductile matrix. We show that the large aspect ratio and the nanometer size of inclusions in the biomorphous MMC lead to significantly improved properties with increased tolerance of interfacial damage. In this case, the partially debonded inclusions continue to carry mechanical load transferred via longitudinal shearing of the matrix material between neighboring inclusions. The larger the inclusion aspect ratio, the larger is the flow stress and work hardening rate for the composite. Increasing the volume concentration of inclusion also makes the biomorphous MMC more tolerant of interfacial damage.

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Cavity formation during tensile straining of particulate and short fibre metal matrix composites

Cited by 127 publications

References 17 publications

Quasistatic and dynamic compression of aluminum-oxide particle reinforced pure aluminum

Quasistatic and dynamic compression of aluminum-oxide particle reinforced pure aluminum

Quantification of microdamage phenomena during tensile straining of high volume fraction particle reinforced aluminium

Flow stress of biomorphous metal–matrix composites

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