Modeling of Axial Compression of Aluminum Matrix Composite V95/10% SiC under Nonstationary Thermomechanical Conditions

To obtain products made of aluminum-matrix composite materials (AMCM) with the required level of mechanical properties, processing by means of intense deformation is necessary. To model the deformation behavior in nonstationary conditions of thermal deformation treatment, the identification of the AMCM model remains an urgent task. One of the approaches to the description of material fluidity is the use of the Johnson–Cook plasticity model. In the proposed work, the object of research is an AMCM made of granulated high-strength aluminum alloy V95 of the Al–Zn–Mg–Cu system, reinforced with 10 wt % SiC particles. The aim of the work is to determine the influence of nonstationary thermomechanical (pressure on the workpiece and heating temperature) deformation conditions on the true deformation and deformation rate of the composite material, as well as to identify the material model and verify its application to study the processes of shape change in the studied pressure and temperature range. An experimental study of the precipitation process under uniaxial compression of sintered cylindrical samples of AMCM in the range of initial pressures of 5.65–7.81 MPa when heated to 510, 530, and 550°C is conducted. In this range, the dependences of the degree of deformation and the average deformation rate for the process are obtained. Identification of the rheological model of the material was carried out. A mode of preliminary thermomechanical processing is proposed and a prototype is manufactured at an initial pressure of 6.7 MPa on the workpiece and heated to 550°C in 84 min. The above mode provided relatively uniform filling of the stamp cavities with composite material. To confirm the possibility of applying the results of parametric identification of the material model, simulation modeling of the technological process of manufacturing a prototype was carried out.