EFFECT OF ELECTRON-BEAM PROCESSING ON THE STRUCTURE AND PROPERTIES OF THE Al – Mg ADDITIVE ALLOY

5xxx series aluminum alloy is widely used in automotive and shipbuilding industries because of its low density, high tensile strength and good corrosion resistance. In this work, the microstructure and phase composition of the Al – Mg alloy, obtained by the method of wire-arc additive manufacturing with further electron-beam processing, were studied. The purpose of this study is to study the effect of electron beam processing on the structure of Al – Mg alloy. Scanning and transmission electron microscopy was used to study the structure of an Al – Mg alloy obtained by wire-arc additive manufacturing. The influence of electron-beam processing at different energy densities for Al – Mg alloy samples fabricated by the wire-arc additive method is considered. It is shown that, regardless of the modes of electron-beam processing, the phase composition in the surface layer does not change, but the average dislocation density increases. Experimental studies of the phase composition and structure of the Al – Mg alloy were carried out. The influence of different modes of electron-beam processing on the change in the microstructure, phase composition, and dislocation density of the additively fabricated Al – Mg alloy has been determined and analyzed. It is shown that with an increase in the energy density of the electron beam, the grain size increases, and the magnesium content on the surface of the Al – Mg alloy decreases. It is shown that, regardless of the modes of electron-beam processing, the phase composition of the surface layer does not change, but the average dislocation density increases.

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