OBRABOTKAMETALLOV technology Vol. 25 No. 3 2023 films. To achieve this aim, the following tasks of the work are formulated: 1) to study the surface profiles of dissimilar materials to be bonded by plastic deformation; 2) to simulate by the finite element method (FE) the plastic deformation of contact surfaces of dissimilar materials on a microscale; 3) to study the stages of joint deformation of dissimilar materials on a microscale and verify of the theoretical mechanism. Materials and methods The object of study was the process of accumulative roll bonding of aluminum alloys D16 (alloy of the 2xxx series, strain- and age-hardenable) and AMg3 (alloy of the 5xxx series, strain-hardenable) [20]. The surfaces of aluminum alloys to be bonded were degreased with acetone, dried, and machined before plastic deformation. Machining of the surfaces of the rolling billets was carried out according to two different modes: (a) belt grinding with 40 grit (medium grit) and (b) belt grinding with 120 grit (fine grit). Grinding was performed at a belt speed of 250 m/min with the grinding direction coinciding with the rolling direction. The study of three-dimensional topography and roughness was carried out on a Veeco Wyko NT1100 Optical Profiling System. As a result of the study, an array of coordinate points of the surface with an area of 1159 × 756 μm and roughness parameters were obtained: average roughness Ra, root mean square roughness Rq, and total height of the roughness profile Rt. The array of coordinate points was used to create a three-dimensional surface and three-dimensional representative volume elements of near-surface layers of materials with dimensions of 1,159 × 756 × 600 (L × W × H) for microscale FE simulation. Fig. 1. Microscale theoretical model of plastic deformation of dissimilar materials
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