Hot deformation of porous blanks of the Al-TiC system

Abstract

The article presents the results of the study of the effect of hot deformation on the structure and phase composition of the synthesized aluminum matrix composite of the Al-TiC system. The nature of the distribution of deformations and relative density over the volume of the porous workpiece during its hot deformation in a semi-closed die was established based on the results of computer simulation. Based on the obtained data, the impact of the stamping scheme on the phase and structure formation during the production of axisymmetric forgings from the dispersion-strengthened alumino-matrix composite was established. Modeling of the hot stamping process was carried out using the finite element method using the DEFORM 2D/3D software complex. The analysis of the obtained modeling results showed that at the final stage of the process, the intensity of deformations is almost uniform throughout the volume of the forging, while characteristic zones of difficult deformations are formed in the upper and lower parts of the section. A detailed analysis of the component deformations showed that the formation of stagnant zones is directly influenced by the radial component of the deformations. In turn, the analysis of the results of experimental studies showed that, despite the presence of stagnant zones, the given hot deformation scheme provides a uniform structure and phase composition of alumino-matric composites of the Al–TiC system, and the in-situ process of titanium carbide formation allows it to be evenly distributed throughout the volume of the composite . The uniformity of the structure and phase composition ensures low anisotropy of properties over the stamping volume, and therefore the proposed stamping scheme can be used to obtain semi-finished products with specified physical and mechanical properties.