Abstract
We present a combined experimental and computational investigation of the mechanical properties of a CoCrFe\(_{0.75}\)NiNb\(_{0.125}\)Mo\(_{0.3}\) high-entropy alloy additively manufactured via cold spray. We find that the sprayed alloy exhibits extraordinary mechanical properties under compression, reaching yield stress of \(\sim \)1745 MPa, ultimate stress of \(\sim \)2622 MPa, and a maximum strain at failure of \(\sim \)9%. These exceptional mechanical properties are the result of four independent hardening mechanisms. Using a novel design condition, an optimal solid solution and precipitation strengthening alloy are obtained from ab initio simulations. We show how the microstructure can be tailored to develop optimal mechanical strength using additive manufacturing. These subtle atomic and microstructural features result in outstanding experimentally evaluated yield and ultimate stresses compared to other high-entropy alloys with similar compositions.KeywordsHigh-entropy alloysCold sprayAb initioMaterials design
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