| Abstract Scope |
Superalloy 718 and its derivatives are ubiquitous to aeroengine applications owing to their excellent formability, ultra-high-strength, good thermal stability, adequate weldability, and so forth. However, currently, the relatively lighter Ti-comprising high entropy alloys, having a unique combination of ambient and elevated temperature mechanical properties and corrosion resistance, are projected as potential competitors to superalloy 718 and their derivatives. We analyzed the data of several Ti-comprising high entropy alloys available in the literature by a novel combination of multiple attribute decision making (MADM) and advanced statistics— hierarchical clustering (HC) and principal component analysis (PCA)—to identify the probable competitors to superalloy 718 for aeroengine applications. The ranks assigned by six MADMs, chosen for the investigation, including ARAS (additive ratio assessment), MEW (Multiplicative exponent weighing), OCRA (operational competitiveness ratio), ROVM (range of value method), SAW (simple additive method), and WEDBA (weighted Euclidean distance-based approach), were concordant. PCA consolidated the MADM ranks of the alloys, while HC identified similar top-ranked alloys. The analyses identify the Ti-comprising high entropy alloys having properties comparable to superalloy 718 and reveal the potential of the Ti-comprising high entropy alloys to substitute critical parts in aeroengines. |