Anin situ HVEM study of dislocation generation at Al/SiC interfaces in metal matrix composites

Vogelsang, Mary; Arsenault, R.J.; Fisher, R. M.

doi:10.1007/bf02643944

Cited by 499 publications

(112 citation statements)

References 13 publications

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“…It should be noted that we chose a value of AT equal to 200°C. It is supported by the observations of Vogelsang et al [4], who observed in an in-situ TEM experiment, that the generation of dislocations during the cooling from an elevated temperature of a 20% particulate MMC started only at 500K. Moreover, the work of Seyed et a1 [8] performed on a 6061 matrix composite reinforced with 20 % Sic particles showed that only below 573K, the effect of the thermally induced dislocations is simcant.…”

Section: Before Punchingsupporting

confidence: 73%

Mechanical properties of aluminium-based metal matrix composites reinforced with α-alumina platelets

Massardier¹,

Fougères²,

Merle³

1993

J. Phys. IV France

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To cite this version:Véronique Massardier-Jourdan, R. Fougeres, P. Merle. Mechanical properties of aluminium-based metal matrix composites reinforced with α-alumina platelets. ABSTRACTThe tensile properties of an aluminium-based metal matrix composite reinforced with a-alumina platelets were investigated from an experimental and a theoretical point of view. An increase in Young modulus, 0,2% proof stress, flow stress and ultimate tensile strength was observed over the unreinforced metal. These improvements were obtained at the expense of the tensile ductility. The experimental results were analyzed using both a dislocation model and a continuum model based on an iterative Eshelby method.

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Section: Before Punchingsupporting

confidence: 73%

Mechanical properties of aluminium-based metal matrix composites reinforced with α-alumina platelets

Massardier¹,

Fougères²,

Merle³

1993

J. Phys. IV France

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“…This technique, developed by Hedges and Mitchell [4], presents great advantages for the imaging of dislocation structures around large inclusions which are difficult to observe by TEM in an undisturbed state, In previous publications, we used silver chloride composites to study thermal mismatch dislocations around glass particles [1] as well as glass microspheres and alumina fibers [2]. We observed tangles of dislocations along the sides of the fibers forming a well-defined plastic zone, as well as rows of prismatic dislocation loops punched at the fiber tip, as observed by Vogelsang et al [5] in whisker reinforced aluminium using TEM.…”

Section: Introductionmentioning

confidence: 57%

Dislocation emission at fibers—II. Experiments and microstructure of thermal punching

Dunand

Mortensen

1991

Acta Metallurgica et Materialia

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Abstract--A decoration technique is used to observe dislocations produced by thermal stresses between glass or alumina fibers and silver chloride, used as a model material for metal matrix composites. Fibers ends are found to punch prismatic loop rows, the length of which is compared with a model presented in Part I of this paper as well as another model based on a mismatching spheroid. The geometry of dislocations punched at fiber ends is discussed for the case where the fiber axis is not coaxial with the glide direction. Elongated loops are also observed to be punched radially by the fiber and their number is correlated to the thermal radial mismatch. A simple model is proposed for the nucleation of such loops, which are usually entangled in a plastic zone surrounding the fiber.Rrsum~-Une technique de drcoration est utilisre pour observer les dislocations produites par tensions thermiques dans un modrle de composite ~i matrice m&allique constitu6 de fibres de verre ou d'alumine et de chlorure d'argent. Les extrrmitrs de fibre 6mettent des rangres de boucles prismatiques dont la longueur est comparre ~i un modrle prrsent6 dans la premirre partie de cet article ainsi qu'd un autre modrle bas6 sur un spheroide incompatible. La gromrtrie des dislocations 6mises en bout de fibre est discutre dans le cas off l'axe de la fibre n'est pas coaxial d la direction de glissement. Des boucles allongres 6mises radialement par la fibre sont aussi observres et leur nombre est corrrl6 d l'incompatibilit6 radiale thermique. Un modrle simple est prrsent6 pour la nuclration de ces boucles qui sont habituellement enchevetrres dans une zone plastique entourant la fibre.Zasammenfassung--Mit einem Dekorationsverfahren werden die Versetzungen sichtbar gemacht, die sich wegen thermischer Spannungen zwischen Glas-oder Aluminiumoxidfasern und Silberchlorid bilden; diese Kombination wird als Modell fiir Verbundmaterialien mit MetaUmatrix angesehen. Die Faserenden stoBen Reihen prismatischer Versetzungsschleifen aus; deren L/inge wird mit dem in Teil I dieser Untersuchung vorgelegten Modell, wei auch mit einem anderen, auf einem fehlpassenden Ellipsoid beruhenden Modell verglichen. Die Geometric der an den Fasereneden ausgestoBenen Versetzungsschleifen wird fiir den Fall diskutiert, dab die Faserachse nicht mit der Gleitrichtung iibereinstimmt. Zus/itzlich wird beobachtet, dab 1/ingliche Versetzungsschleifen yon der Faser radial ausgestoBen werden; ihre Zahl h~ingt mit der thermischen radialen Fehlpassung zusammen. Ein einfaches Modell wird fiir die Bildung solcher Schleifen, die iiblicherweise verschlungen in einer plastischen Zone um die Faser herum verteilt sind, vorgeschlagen.

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“…4 and Table 1. The particular interdependence has been noted in several other studies of particle reinforced metals [13,29,[65][66][67][68][69], and has been attributed primarily to the size dependent generation of geometrically necessary dislocations upon cooldown from the processing temperature [70,71]. The size dependence of the yield stress in the present composites is analysed in detail elsewhere [72].…”

Section: Young's Modulus and Yield Stressmentioning

confidence: 77%

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

et al. 2001

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Abstract-Particle reinforced composites are produced by infiltrating Al 2 O 3 particle beds with high purity Al (99.99%). These materials feature 40-60 vol. pct reinforcement homogeneously distributed in a pore-free matrix. Their tensile behaviour is studied as a function of reinforcement size and shape. Internal damage, in the form of particle fracture and matrix voiding, occurs from the onset of plastic straining. Its evolution with strain is monitored through changes in (i) stiffness and (ii) peak stress after incremental plastic straining and annealing. The influence of damage on the flow curves of the composites can be accounted for using basic postulates of continuum damage mechanics. Failure strains vary between 2 and 4%, and are a function of the rate of damage accumulation. An expression is derived to predict elongation to failure of damaging materials that fail by tensile instability, which gives good agreement with the experimental observations. 

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Anin situ HVEM study of dislocation generation at Al/SiC interfaces in metal matrix composites

Cited by 499 publications

References 13 publications

Mechanical properties of aluminium-based metal matrix composites reinforced with α-alumina platelets

Mechanical properties of aluminium-based metal matrix composites reinforced with α-alumina platelets

Dislocation emission at fibers—II. Experiments and microstructure of thermal punching

Influence of damage on the tensile behaviour of pure aluminium reinforced with ≥40 vol. pct alumina particles

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