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Study into the effect of strengthening phase amount in aluminum-based dispersion-hardened composite on failure process regularities

The paper presents the results obtained when studying static tensile strength of aluminum-based cast dispersion-hardened composites with a different content of the Al2O3strengthening phase. The investigated materials are manufactured using a fundamentally different technology for the production of cast dispersion-hardened aluminum composites based on the process of burning out the aluminum melt when interacting with oxygen or an oxygen-nitrogen mixture. The fractographic patterns of static failure surfaces are stidued on samples failed at maximum stress values. It is found that samples with the low Al2O3content have a purely viscous failure pattern consisting mainly of a single fibrous zone. The fracture pattern shows a radial area with a solid phase doubled, while a tripled Al2O3content causes viscous failure by the separation and shear mechanism alternated with brittle cleavage failure signs. The fracture profile diagrams of samples containing 10 % and 30 % of solid phase inclusions reveal no sharp relief differences, but demonstrate a completely different failure pattern. However, in both cases profile diagrams feature no any abrupt jumps in the relief or extreme profile values, so it is possible to assert that failure processes are stable. This is not true for the 20 % Al2O3sample failure showing a rather significant one-time drop. Optical microscopy reveals features of changes in the failure surface relief and the difference in the location and number of fracture origins in the studied samples.