Numerical simulation on the liquid-solid extrusion process for forming Al₂O_3sf/LY12 composite tubes

The forming process of the liquid-solid extrusion composite tube is simulated by means of thermal rigid-plastic quasi-coupled FEM to reveal its plastic deformation behavior. According to the FEM simulation system software, the stress field, the strain field, the temperature field and the deformation pressure are obtained by the re-meshing technology, and the relative problems, including the stress-strain constitutive relation and the simplified method for the liquid area in the deforming body, are analyzed. The comparison of the numerical simulation results and the experiments has validated the reliability of the system, which provides a theoretic basis for the assurance of the product forming quality and the rational choice of the technology parameters.