<p>This study systematically investigates the radial shrinkage and rheological coupling feeding mechanism of high-strength aluminum alloy disk parts during direct squeeze casting. Disk parts exhibit significant volumetric shrinkage during the casting stage, and their complex geometric shapes are more prone to feeding defects, posing a critical challenge for improving casting quality. Based on experimental characterization of the radial pressurizing rheological behavior of disk parts, this research analyzes variations in density and mechanical properties at different rheological distances from the applied force (defined as the rheological radius). Building on this foundation, a radial rheological coupling feeding framework is developed to reveal how the liquid metal’s rheology and the solidification process control feeding capability. The results indicate that, as the rheological radius increases, the difference between the feeding driving force and the material’s rheological resistance gradually decreases, and can become negative, leading to a transition from complete feeding to incomplete feeding. Combined with a rheological model for the alloy melt, criteria for arresting rheological feeding are proposed. This work provides a theoretical basis for optimizing squeeze casting processes for high-strength aluminum alloy disk parts and offers significant technical support for related production practices.</p>