This invention provides a multi-element
alloy coating, its
toughening design method, and its preparation method. The design method includes: screening a multi-element
alloy system and rare-earth strengthening elements; screening target composition ranges with high
toughening potential; forming a substrate
coating using high-
throughput magnetron
sputtering; selecting a target
substrate composition with a single disordered
solid solution phase; co-
sputtering with rare-earth strengthening elements to form a phase transformation-controlled
coating; performing structural characterization and performance testing; and selecting a coating composition and element content with an ordered phase formed by the transformation of a single disordered
solid solution phase under rare-earth-induced conditions, and whose coating performance meets the design objectives, as the design output. This invention, for the first time, combines the technological advantages of magnetron
sputtering with the phase transformation-inducing function of rare-earth elements, achieving ordered
toughening of the coating under relatively low-temperature conditions, providing a new approach for the development of high-performance coatings.