Titanium alloys, with their low density, exceptional mechanical properties, and outstanding corrosion resistance, play a vital role in various aerospace applications. Our decision science-driven assessment focused on metastable beta, near-beta, alpha + beta, and near-alpha Ti alloys for landing gear applications, integrating multiple-attribute decision-making (MADM) methods, principal component analysis (PCA), and hierarchical clustering (HC) is based on current literature. The ranks of the alloys evaluated by diverse MADM methods were consistent. The methodology identifies five top-ranked Ti alloys assists and verifies the guidelines for alloy design. The top-ranked alloy, Ti1300-BM-nano-alpha (alloy chemistry: Ti-5Al-4V-4Mo-3Zr-4Cr, solution treatment: 800 degrees C for 1 h followed by air cooling-solution treated below beta transus, and aging: 500 degrees C for 4 h followed by air cooling), stands out with a percentage elongation (%EL) similar to 3.3 times greater than the benchmark or goal (density, d = similar to 4.6 g/cm(3); yield strength YS = similar to 1250 MPa; %El = similar to 5), while maintaining similar density and yield strength. The analyses underline that metastable beta Ti alloys comprising globular primary alpha + trans beta matrix coupled with alpha precipitates in trans beta are the base optimal microstructure to fine-tune using thermomechanical processing for aircraft landing gear applications.
