Deformation in Al-z.sbnd;SiC composites due to thermal stresses

Flom, Yury; Arsenault, R.J.

doi:10.1016/0025-5416(85)90186-7

Cited by 66 publications

(16 citation statements)

References 7 publications

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“…Theory able in the literature (and the model proposed Various workers have used a continuum above is no exception) use simple idealized approach [3,8,10,15,[17][18][19][20][21][22][23][24] to predict the shapes such as cylinders, spheres or ellipsoids to volume of plastic zones around inclusions describe particles in MMCs. However, commerembedded in metal.…”

Section: Resultsmentioning

confidence: 99%

“…Plasticity due to thermal incompatibilparent model material for the matrix of particleity has been studied experimentally in metals reinforced MMCs. It is well known that silver reinforced with particles, whiskers and fibers chloride is very ductile (up to 400% tensile using etch pits [1,2], slip lines [3] as well as transelongation) and that it exhibits dislocation mission electron microscopy (TEM) [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Thermal mismatch dislocations produced by large particles in a strain-hardening matrix

Dunand

Mortensen

1991

Materials Science and Engineering: A

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Silver chloride containing particles of irregular form of the order of 1 ktm in diameter is used as a model material for particle-reinforced metal matrix composites (MMCs). Matrix dislocations due to the mismatch of the coefficients of thermal expansion of the two phases are made visible to transmission optical microscopy through bulk decoration performed at room temperature. The plastic zone around the particles takes two forms, similar to what is observed around the glass microspheres: (a) rows of coaxial prismatic dislocation loops punched into the matrix and (b) a plastic zone of irregular form containing partially resolved tangled dislocations. A relationship between the inclusion volume and the volume of the plastic zone around the inclusion--developed for the geometrically tractable problem of a sphere embedded in a strain-hardening matrix deforming by slip--is found to be valid for particles of irregular form as well, which are more representative of the reinforcement used in MMCs than spheres [ire.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal mismatch dislocations produced by large particles in a strain-hardening matrix

Dunand

Mortensen

1991

Materials Science and Engineering: A

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“…This is caused by the strain fields containing residual stresses in matrix around the reinforcement. As the strain fields containing residual stresses 22,26) in the matrix adjacent to the reinforcement form energy barriers for the flow of electrons, the electrical conductivity of composites was reduced. During preparing the composites, the difference of thermal expansion between VGCF and Al leads to the residual stresses.…”

Section: )mentioning

confidence: 99%

Fabrication and Electrical Conductivity of Vapor Grown Carbon Fiber Reinforced Aluminum Composites

Choi

Matsugi

et al. 2009

Mater. Trans.

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Vapor grown carbon fiber (VGCF) reinforced aluminum matrix composites were fabricated by spark sintering processes. VGCFs in composites became to be dispersed uniformly in the aluminum matrix by decreasing a diameter of aluminum powder. The electrical conductivity of composites was reduced remarkably compared with monolithic aluminum block. On the other hand, the electrical conductivity of the composites was slightly reduced with increasing a diameter of aluminum particle. Meanwhile, the experimental electrical conductivity of VGCF/Al composites was lower than the theoretical one calculated by Chang's and Fan's models, which is caused by the strain fields containing larger residual stress in aluminum matrix around VGCF.

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“…The formation of a plastic zone around an inclusion embedded in metal when the misfit strain is pure dilatation has been modelled by various authors using a continuum approach [3,8,[24][25][26][27][28][29][30][31][32]. In what follows, we propose an alternative method to calculate the size of the plastic zone surrounding inclusions of simple misfitting shape, namely spheres and cylinders embedded in a monocrystalline, elastically isotropic single-phase matrix.…”

Section: Theorymentioning

confidence: 99%

On plastic relaxation of thermal stresses in reinforced metals

1991

Composites

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Abstract--Silver chloride containing alumina fibers or glass microspheres is used as a model material to study matrix plasticity induced by thermal mismatch in metal matrix composites. Resulting matrix dislocations are decorated at room temperature in the bulk material and observed by optical microscopy. Plastic deformation of the matrix around the inclusions is found to take the form of (i) rows of prismatic dislocation loops punched into the matrix and/or (ii) a plastic zone containing tangled dislocations surrounding the inclusions. From the number of loops punched by spheres, the temperature interval over which slip of prismatic loops is operative is calculated to be 100 + 30 K wide. The stress in the plastic zone around fibers is determined from the radius of curvature of pinned dislocations, leading to the conclusion that the matrix is locally strain-hardened. A simple model taking this fact into account is proposed to predict the radius of the plastic zone around embedded cylinders and spheres and is compared to the experimental data.Rrsum~-Le chlorure d'argent contenant des fibres d'alumine ou des microsphrres de verre est utilis6 pour 6tudier la plasticit6 induite par incompatibilit6 thermique darts la matrice de matrriaux composites matrice m&allique. Les dislocations qui en rrsultent sont drcorres dans la matrice ~i temprrature ambiante et observres par microscopie optique. La drformation plastique de la matrice autour de ces inclusions se manifeste par (i) des rangres de boucles de dislocations prismatiques et/ou (ii) une zone plastique contenant des dislocations emmrlres autour des inclusions. A partir du nombre de boucles engendrres par les sphrres, une valeur de I00 _.+ 30 K est calculre pour l'intervale de temprrature pendant lequel le glissement de boucles prismatiques est oprrationel. La tension dans la zone plastique autour de la fibre est ddterminre ~. partir du rayon de courbure de dislocations bloqures, ce qui conduit ~ la conclusion que la matrice est localement 6crouie. Un modrle simple tenant compte de ce fait est propos6 pour prrdire le rayon de la zone platique autour de cylindres ou de sphdres et compar6 aux donnres exprrimentales.Zusammenfassung--Silberchlorid mit Aluminiumoxid Fasern oder Glassmikrokugeln wird als Modellmaterial beniitzt, um die thermisch induzierte Matrixplastizit/it in Verbundwerkstoffen mit metallischer Matrix zu studieren. Resultierende Matrixversetzungen werden bei Raumtemperatur im Materialinnern dekoriert und durch optische Mikroskopie beobachtet. Plastische Verformung der Matrix um die Einschlfisse wird in Form von (i) Reihen yon in die Matrix ausgestossenen prismatischen Versetzungsringen und/oder (ii) einer plastischen Zone, die Versetzunganh/iufungen um den Einschluss enth/ilt, beobachtet. Aus der Zahl der von den Kugeln ausgestossenen Ringen wird das Temperaturinterval, w/ihrend dessen Gleitung prismatischer Ringe wirksam ist, als 100 + 30 K ausgerechnet. Die Spannung in der plastischen Zone um die Fasern wird aus dem Kriimmungsradius blockierter Versetz...

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Deformation in Al-z.sbnd;SiC composites due to thermal stresses

Cited by 66 publications

References 7 publications

Thermal mismatch dislocations produced by large particles in a strain-hardening matrix

Thermal mismatch dislocations produced by large particles in a strain-hardening matrix

Fabrication and Electrical Conductivity of Vapor Grown Carbon Fiber Reinforced Aluminum Composites

On plastic relaxation of thermal stresses in reinforced metals

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