Laser 3D printing of CoCrFeMnNi high-entropy alloy

Due to their superior properties, high-entropy alloys (HEAs) are considered as novel structural materials that can substitute conventional alloys. From the viewpoint of future applications, it is important to explore methods for producing complex shaped and homogeneous HEAs. In this study, laser 3D printing technology is employed to fabricate CoCrFeMnNi HEA. The microstructure and mechanical properties of laser 3D printed HEA are also evaluated. An equiaxed-to-columnar transition structure can be observed in the melt pool of the printed sample. The fine BCC phase is found to distribute at the grain boundaries of the FCC matrix, which is the major phase of the printed sample. The printed HEA exhibits an outstanding combination of high strength and excellent ductility.