Modification and verification of the Shima yield model for hot pressed metal matrix composites of aluminium ZL109 alloy and SiC powder

ZL109-SiC cylindrical specimens with different relative densities were prepared using the hot pressing sintering process. Based on uniaxial compression tests at room and high temperatures, a modified high-temperature Shima yield model for metal matrix composites was established, taking into account the effect of temperature on the yield behavior. The modified yield model was imported into MSCMarc software. Through uniaxial compression experiments at room and high temperatures, and by incorporating the relative density, axial strain, radial strain, and volumetric strain, the stress modification factor and the hydrostatic pressure influence factor were introduced. A nonlinear surface fitting approach was applied to the experimental data to establish the modified Shima yield model. Subsequently, finite element simulations of the hot pressing sintering forming process for the cylindrical specimens were carried out to verify the reliability of the modified Shima yield model at high temperatures. The results show that the relative errors between the simulation results and the experimental results are within 10%, which effectively verifies the reliability of the high-temperature modified Shima yield model.