Conventional Ti alloys for aeroengines and aircraft landing gear beams—a data-driven selection and future directions

Titanium alloys find manifold aerospace applications owing to their superior combination of mechanical properties, corrosion resistance, lightweight, and so forth. We analyzed the available data, in the literature, of the titanium alloys for two critical applications: aeroengines and landing gear beams. We applied fundamental statistical analysis (FSA), principal component analysis (PCA), and multiple-attribute decision making (MADM) to unearth the voice of the data. The ranks assigned by several MADMs, including ROVM (range of value method), MEW (multiplicative exponent weighing), and ARAS (additive ratio assessment method) were consistent. FSA and PCA consolidated the MADM ranks of the alloys and identified similar top-ranked alloys. The investigations highlight differences (and similarities) across several grades/variants of the alloys, suggest potential replacement or substitute for the existing alloys, weed-out some of the heavier alloys and consequently augment in reducing the weight, and provide possible directions for improvement and/or development of these alloys.