Tensile fracture processes of a unidirectionally solidified Al-Al3Ni eutectic (an Al-matrix composite strengthened by Al3Ni fibers) were investigated in a temperature range of 293-673K from a microstructural point of view.micro-voids at the sites of fiber break. It was suggested that local stresses around micro-voids were transmitted quickly to adjacent fibers by the matrix shear due to dislocation activity, resulting in the brittle fracture of the eutectic. In this case, the tensile strength of the eutectic was predictable from the socalled rule of mixture.was concentrated developed across a cross-section of the specimen prior to the fracture of eutectic. In the interior of the band, fibers had been broken into short pieces in a ductile manner with local necking, and no micro-voids had been formed at the sites of fiber break. Nucleation of micro-voids was ascribed to a process in which these short fibers were pulled out from the matrix. The micro-voids grew by plastic deformation of the matrix, and the resultant fracture of the eutectic was caused by the linkage of grown voids in a ductile manner. Further, such ductile breakage of fibers embedded in the matrix was in contrast with the brittle one observed in fibers themselves taken out from the eutectic. By this result it is implied that, for an understanding of the high-temperature strength of the eutectic, the effect of the ductile matrix on the deformation and/or breakage behavior of brittle fibers should also be taken into consideration.
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