Effect of reinforcement-particle-orientation anisotropy on the tensile and fatigue behavior of metal-matrix composites |
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Authors: | V V Ganesh N Chawla |
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Affiliation: | (1) the Department of Chemical and Materials Engineering, Arizona State University, 85287-6006 Tempe, AZ |
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Abstract: | The effect of extrusion-induced particle-orientation anisotropy on the mechanical behavior of metal-matrix composites (MMCs)
was examined. In this study, we have shown that this anisotropy has a significant influence on the tensile and fatigue behavior
SiC particle-reinforced Al alloy composites. The preferred orientation of SiC particles was observed parallel to the extrusion
axis, with the extent of orientation being highest for the lowest-volume-fraction composites. The composites exhibited higher
Young’s modulus and tensile strength along the longitudinal direction (parallel to the extrusion axis) than in the transverse
direction. The extent of anisotropic behavior increased with increasing volume fraction, because of the increasing influence
of the SiC reinforcement on the Young’s modulus and tensile properties. The preferred orientation also resulted in anisotropy
in the fatigue behavior of the composite material. The trends mirrored those observed in tension, with higher overall fatigue
strengths for both orientations and a higher anisotropy with increasing volume fraction of particles. The influence of particle-orientation
anisotropy and the resulting tensile and fatigue damage mechanisms is discussed. |
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