The document summarizes research on modifying the microstructure of aluminum alloys through heat treatment and titanium addition. Key findings include: 1) Adding 0.09% titanium partially modifies the silicon particle structure, while 0.18% titanium achieves full modification. 2) Heat homogenization changes the shape of silicon particles from lamellar to spherical through a six-stage process. 3) Higher titanium content (0.18%) refines the aluminum dendrites and inhibits silicon growth, improving mechanical properties.