| Abstract Scope |
Superalloy 720 is ubiquitous to a myriad of high-temperature applications, including weldoverlay coatings for hot-forging dies. Currently, high-entropy alloys, having a unique combination of ambient and elevated temperature properties, appear as potential competitors to superalloy 720 as coatings for conventional hot-forging die materials, e.g., Uddeholm Dievar or H13. We analyzed the refractory high-entropy alloys (RHEAs) available in the current literature by decision science-driven techniques, including multiple-attribute decision making (MADM), for sorting and ranking the RHEAs. The ranks assigned by several MADMs, viz. WEDBA (weighted Euclidean distance-based approach), ROVM (range of value method), ARAS (additive ratio assessment), etc., were consistent. Principal component analysis (PCA) consolidated the ranks, while hierarchical clustering (HC) discerned the similarities among the alloys. The investigation identified contender RHEAs having properties superior to superalloy 720, revealed their potential as coatings for hot-forging dies, and suggested directives for further development. |