Additively manufactured fine grained Ni6Cr4WFe9Ti high entropy alloys with high strength and ductility

Abstract High entropy alloys with excellent mechanical properties have broad application scope and market demand. However, a long-standing problem for these alloys is their low ductility. In this work, a novel alloy (Ni6Cr4WFe9Ti) with fine grained structure was prepared, which exhibited fracture strength of over 970 MPa and tensile elongation as large as ∼12.2% at room temperature. The processing route involved additive manufacturing via a selective laser melting technique which resulted in an optimal microstructure of fine grains with nanoparticles uniformly distributed in the matrix alloy. This approach can effectively refine the crystalline structure and the coarse grain boundary precipitates, to provide a general pathway for manufacturing fine grained material with both high strength and ductility.