Journal ArticleDOI
Creep rupture of a silicon carbide reinforced aluminum composite
TLDR
In this paper, the microstructure, texture, and whisker orientations in 6061 Al-20 wt pct SiC whisker composites have been examined using transmission electron microscopy and X-ray diffraction.Abstract:
The microstructure, texture, and whisker orientations in 6061 Al-20 wt pct SiC whisker composites have been examined using transmission electron microscopy and X-ray diffraction. Tension creep tests of the composite material have also been conducted in the temperature range 505 to 644 K (450 to 700 F). The steady state creep rate of the composite depends strongly on the temperature and applied stress. The stress exponent for the steady state creep rate of the composite is approximately 20.5 and remains essentially constant within the range of test temperatures. The activation energy is calculated to be 390 kJ/mol, nearly three times as high as the activation energy for self-diffusion of aluminum. No threshold stress was observed. Fracture surface examination using scanning electron microscopy shows that the composite fails by coalescence of voids in the aluminum matrix which originate at the aluminum-SiC interface. It is demonstrated that SiC paniculate composites are less creep resistant than SiC whisker composites.read more
Citations
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Particulate reinforced metal matrix composites — a review
TL;DR: The physical and mechanical properties that can be obtained with metal matrix composites (MMCs) have made them attractive candidate materials for aerospace, automotive and numerous other applications as discussed by the authors.
Journal ArticleDOI
Effect of fibre debonding in a whisker-reinforced metal
TL;DR: In this article, the debonding behaviour at the interface is represented in terms of a cohesive zone model that describes decohesion by normal separation and tangential separation, and the effect of friction during pullout is included in the model.
Journal ArticleDOI
The physics and mechanics of fibre-reinforced brittle matrix composites
Anthony G. Evans,Frank W. Zok +1 more
TL;DR: In this paper, a review of the mechanical and structural performance of brittle matrix composites is presented, focusing on the stress/strain behaviour in tension and shear, the ultimate tensile strength and notch sensitivity, fatigue, stress corrosion and creep.
Journal ArticleDOI
Analysis of tensile properties for a whisker-reinforced metal-matrix composite
TL;DR: In this article, a micro-mechanical model is used to analyse the tensile properties of a ductile metal reinforced by short fibres, and the analyses focus on uniaxial tension in the fibre direction, but also the effect of stress triaxiality is investigated.
References
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Journal ArticleDOI
Mechanical behavior of crystalline solids at elevated temperature
Oleg D. Sherby,Peter M. Burke +1 more
TL;DR: In this paper, the mechanical behavior of crystalline solids at elevated temperatures is discussed, including the creep properties of metals, solid solutions and two phase alloys, and the properties of two-phase alloys.
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Theory of Steady‐State Creep Based on Dislocation Climb
TL;DR: In this article, a theory of steady-state creep is developed using Mott's mechanism of dislocation climb, which is assumed in the analysis that the rate-controlling process is the diffusion of vacancies between dislocations which are creating vacancies and those which are destroying them.
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Dislocation movement through random arrays of obstacles
A. J. E. Foreman,M. J. Makin +1 more
TL;DR: In this paper, the detailed movement of a dislocation line through a random array of point obstacles in the glide plane has been examined, using a digital computer, on the basis of the line tension approximation.
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