Thermodynamic Model-Guided Regulation of Self-propagating In-Situ Synthesis of Titanium–Aluminum Alloys

This study investigates the controlled fabrication of Ti45Al8Nb alloy using self-propagatingSelf-propagating in-situIn-situ synthesis guided by thermodynamic modeling. It explores the impact of the AlAl stoichiometric ratio on alloy and slagSlag composition, microstructural morphology, and inclusionInclusions distribution. Findings demonstrate the thermodynamic model's effectiveness in governing desired alloy composition, guiding titanium-aluminum alloyAluminum alloys composition tailoring. Under specific conditions (AlAl stoichiometric coefficient 0.8, system’s specific reaction enthalpy 3250 J/g), a titanium-aluminum alloyAluminum alloys with TiTi, AlAl, Nb, O, and N mass fractions of 51.8, 29.5, 17.4, 1.2, and 0.0016 wt% is achieved. The primary phases are TiAl and TiAl3/NbAl3. Increasing aluminumAluminum content reduces inclusionInclusions content and size. This study proposes an efficient, scalable method for producing high-quality titanium-aluminum alloysAluminum alloys at a reduced cost by leveraging the thermodynamic model to predict and regulate self-propagatingSelf-propagating synthesis.