On the toughness of brittle materials reinforced with a ductile phase

Sigl, Lorenz S.; Mataga, Peter; Dalgleish, B.J.; McMeeking, Robert M.; Evans, A.G.

doi:10.1016/0001-6160(88)90149-6

Cited by 406 publications

(138 citation statements)

References 4 publications

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“…An example of such damage evolution within a binder ligament is shown in Figure 5. Obtained micrographs represent experimental evidence (and thus validate) several statements postulated by Sigl and co-workers after their systematic and thorough investigation on the fracture behavior of WC-Co cemented carbides [6,10,11,13], as follows:…”

Section: Toughening Mechanisms In Wc-co Cemented Carbidessupporting

confidence: 85%

“…The outstanding fracture toughness levels exhibited by hardmetals are mainly associated with toughening derived from plastic stretching of crack-bridging ductile enclaves [5][6][7]. Within this context, cracks propagate throughout the composite assembly, leaving isolated metallic ligaments behind the crack tip.…”

Section: Introductionmentioning

confidence: 99%

“…The energy required to plastically deform the constrained ductile ligaments is the main contribution to the toughness of these materials [5][6][7][8][9][10][11][12]. Plastic deformation of these reinforcing ligaments is restricted to the binder regions crossed by the crack plane and proceeds through nucleation, growth and coalescence of microcrocavities [6,[9][10][11][12][13][14][15]. As in the case for brittle solids reinforced with a ductile phase (e.g.…”

Section: Introductionmentioning

confidence: 99%

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FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Tarragó

Jiménez‐Piqué

Schneider

et al. 2015

Materials Science and Engineering: A

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Exceptional fracture toughness levels exhibited by WC-Co cemented carbides (hardmetals) are due mainly to toughening derived from plastic stretching of crack-bridging ductile enclaves. This takes place due to the development of a multiligament zone at the wake of cracks growing in a stable manner. As a result, hardmetals exhibit crack growth resistance (R-curve) behavior.In this work, the toughening mechanics and mechanisms of these materials are investigated by combining experimental and analytical approaches. Focused Ion Beam technique (FIB) and Field-Emission Scanning Electron Microscopy (FESEM) are implemented to obtain serial sectioning and imaging of crack-microstructure interaction in cracks arrested after stable extension under monotonic loading. The micrographs obtained provide experimental proof of the developing multiligament zone, including failure micromechanisms within individual bridging ligaments. Analytical assessment of the multiligament zone is then conducted on the basis of experimental information attained from FIB/FESEM images, and a model for the description of R-curve behavior of hardmetals is proposed. It was found that, due to the large stresses supported by the highly constrained and strongly bonded bridging ligaments, WC-Co cemented carbides exhibit quite steep but short R-curve behavior. Relevant strength and reliability attributes exhibited by hardmetals may then be rationalized on the basis of such toughening scenario.

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Section: Toughening Mechanisms In Wc-co Cemented Carbidessupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Tarragó

Jiménez‐Piqué

Schneider

et al. 2015

Materials Science and Engineering: A

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“…16 Addition of a metal to a brittle ceramic can increase the K IC and ductile response of the material while retaining most of the stiffness and strength imparted by the ceramic. 17,18 By using a porous preform, the metal acts as a system of ductile inclusions within the interconnected ceramic. Increased K IC results from mechanisms such as plastic stretching of the inclusions, decohesion between the metal and the ceramic, and fracture of the ceramic phase near the inclusions, all of which increase the work required for crack propagation.…”

Section: Introductionmentioning

confidence: 99%

“…19,20 Also, residual stresses can increase the initial force needed for crack propagation and induce plastic strain in inclusions, which can act to shield a crack tip. 18 The objective of this work is to study the mechanical properties and the underlying deformation and fracture micromechanisms of the wood-derived SiC-Al alloy MCCs from 25 to 500°C. The composite properties are compared to those of the Al-Si-Mg alloy and, where data are available, to the porous wood-derived SiC.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

et al. 2008

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The mechanical behavior [i.e., stiffness, strength, and toughness (K IC )] of SiC Al-Si-Mg metal-ceramic composites (50:50 by volume) was studied at temperatures ranging from 25 to 500°C. The SiC phase was derived from wood precursors, which resulted in an interconnected anisotropic ceramic that constrained the pressure melt-infiltrated aluminum alloy. The composites were made using SiC derived from two woods (sapele and beech) and were studied in three orthogonal orientations. The mechanical properties and corresponding deformation micromechanisms were different in the longitudinal (LO) and transverse directions, but the influence of the precursor wood was small. The LO behavior was controlled by the rigid SiC preform and the load transfer from the metal to the ceramic. Moduli in this orientation were lower than the Halpin-Tsai predictions due to the nonlinear and nonparallel nature of the Al-filled pores. The LO K IC agreed with the Ashby model for the K IC contribution of ductile inclusions in a brittle ceramic.

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Composite Materials, Ceramic‐Matrix

Butler

Fuller

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Ceramic‐matrix composites are materials for use in high temperature structural applications. The intrinsic properties of the ceramic‐matrix such as high melting point, high chemical stability, high elastic modulus and hardness, high wear and creep resistance along with low mass density relative to metallic materials are coupled with the properties of high fracture resistance and flaw insensitivity when reinforced with a high strength second phase. The varieties of reinforcements include particles, platelets, whiskers, and continuous fibers. Placement of reinforcements within the matrix determines the isotropy of the composite properties. Particulate reinforced matrices derive their toughness from processes such as crack deflection, crack pinning and bowing, microcracking, and frictional bridging mechanisms. Whisker, platelet, and fiber‐reinforced matrices derive their toughness from crack‐wake frictional bridging and pull‐out mechanisms. For the mechanism of crack‐wake bridging the most important aspect of the composite is the interface between the reinforcement and the matrix. It must be weak enough to allow debonding around the reinforcement leaving it as an intact bridging element in the crack‐wake. Control of the interface between the matrix and reinforcements is extremely important in optimization of composite properties.

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On the toughness of brittle materials reinforced with a ductile phase

Cited by 406 publications

References 4 publications

FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

Composite Materials, Ceramic‐Matrix

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