The microstructure of the singlecrystal-matrix composites, especially tensile fracture surface were analyzed. The optical and electron microscopy were used. The voids distribution in the composite and their size were studied. The voids impact on the composites stability and the way of cracking were analyzed. The reason and region of voids formation and their role in cracking process were discussed. The influence of the pores on the brittleness of Al‑Cu‑Fe singlecrystal-matrix composites containing quasicrystal phase fraction were determined.

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