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The aluminum and titanium plates were irradiated by the high-current electron beam with the electron energy around 0.35 MeV, impulse duration of 5 µs, beam current of 2 kA, and with the incident energy density up to 3.5 MJ/m 2. The cross-fractures were made in the modified and non-irradiated areas. The fracture surfaces were examined using a SEM JEOL JSM-840. The irradiation resulted in significant changes of the microstructure parameters (i.e. grain size, damage character). The fractal dimension of the grayscale SEM images of the fracture surfaces were statistically analyzed using the arithmetic, geometric and divisor step methods with the sliding square window of varying size. The calculated distributions of fractal dimensions helped to characterize the scaling behavior of the microstructures, which accompany a shift of the fracture mechanism into preferably brittle mode.

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