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The paper studies the distinctive features of micro-hardness value changes in the zone of industrial aluminum alloy 1933 and alloy 1380 irradiated by the relativistic electron beam. The surface layer was modified under the relativistic electron beam injected along with the equal energy parameters. However, we have to claim that some physical and technological properties of the irradiated alloys layer came with some differences. The modified layer micro-hardness increased over 30% in 1933 aluminum alloy and decreased by 10% in 1380 aluminum alloy. The mechanisms affecting the metal material strengthening transformation after a pulsed electron beam application are analyzed. Thus it was established that one of the core impacts to increase the micro-hardness of 1933 aluminum alloy surface layer was fine MgO impurities being absent in the initial alloy and caused by the irradiation, whilst the micro-hardness of the irradiated layer of the 1380 aluminum alloy decreases due to the dissolution during irradiation of the strengthening phases, which were identified in the initial state.

The mechanisms of strengthening of the surface layer of D16AT aluminum alloy irradiated with a high-current relativistic electron beam were studied. The alloy was irradiated with an electron beam with a particle energy of 0.35 MeV, a beam current of 2.0 kA, and a pulse duration of 5 μs. This article shows that the processing of D16AT aluminum alloy by a high-current relativistic electron beam leads to melting of irradiated surface and the formation of a surface layer with a modified structural-phase state. The thickness of this layer is approximately 100 m. A solid solution based on aluminum is the main constituent of this layer. At the same time, intermetallic phases that were present in the initial state of the alloy cannot be detected by means of X-ray diffractometry. It was established that processing of the surface of D16AT alloy with a pulsed electron beam leads to grain refining. In the initial state of the alloy, the average grain size is 11 m. In the modified layer, the average grain size is approximately 0.8 m. The microhardness of the irradiated layer increases by almost 50 %. The contribution of different strengthening mechanisms to the change of strength characteristics of the modified surface layer was analyzed. It was shown that the dispersion mechanism makes the main contribution to the strengthening of the alloy in the initial state. While the dislocation mechanism of strengthening plays a key role in increasing the microhardness of the irradiated layer. The importance of these observations for thermomechanical processing of aluminum alloys in order to further improve their strength characteristics was discussed.

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