STRUCTURE AND PHASE COMPOSITION OF MULTILAYER METAL MATRIX COMPOSITE PRODUCED BY HIGH PRESSURE TORSION OF ALUMINUM AND COPPER PLATES

10.25712/ASTU.1811-1416.2025.01.005

Abstract

The structure and phase composition of metal matrix composites obtained by high-pressure torsion of Al and Cu plates with different layer arrangements: 6Cu-5Al and 6Al-5Cu were studied using scanning electron microscopy, X-ray diffraction and energy dispersive analysis. The samples were deformed by high-pressure torsion of 6 GPa for 5 revolutions at a speed of 1 rpm. It was shown that the sample with the 6Al-5Cu plate arrangement has a more uniform structure than the sample with the 6Cu-5Al arrangement. The mixing process in the 6Al-5Cu sample occurs more intensively throughout the entire volume of the sample, while in the 6Cu–5Al sample it occurs only at the edge. X-ray diffraction and energy dispersive analysis showed that the phase composition of the studied samples differs significantly. Intermetallic phases AlCu, Al₂Cu, Al₄Cu₉, as well as a solid solution of aluminum in copper are present in the 6Al-5Cu sample, the basis is aluminum and copper. Similar intermetallic phases are also observed in the 6Cu-5Al sample, and the basis is copper and a solid solution of aluminum in copper. The microhardness of the studied samples, measured in the cross section, is significantly higher than the microhardness of the original metals. Microhardness is formed depending on the obtained structure and phase composition of the studied samples.