Tailoring 7075 alloys for semisolid state processing via in-situ formed TiAl 3

Abstract

Traditional 7075 aluminum alloys are difficult to cast due to low viscosity and high shrinkage. This study addresses these challenges by forming TiAl₃ particles in situ, which enhance viscosity, reduce porosity, and prevent shrinkage cracks. The method involves adding a titanium master alloy to molten 7075 and using mechanical stirring to induce TiAl₃ formation. This improves processability, making the alloy suitable for high-pressure die casting (HPDC) in the aerospace and automotive industries. Microstructural analysis confirms that uniformly distributed TiAl₃ particles refine grains and enhance stability. The study employs microscopy, X-ray diffraction, thermodynamic simulations, and mechanical testing to validate structural properties, advancing 7075 alloy processing for large-scale applications in semisolid techniques.