Abstract
The high-entropy alloys (HEAs) are a new class of engineering materials containing multiple principal elements and show superior mechanical properties. The microstructure of the fabricated HEAs varies considerably for different fabrication routes. The development of 3D-printed HEAs overcomes the challenges associated with the conventional manufacturing methods of these novel materials. The CoCrFeMnNi alloy with a face-centered cubic crystal structure, also known as the Cantor alloy, has proved to be one of the toughest engineering materials. The multi-scale microstructure of the 3D-printed CoCrFeMnNi alloy is composed of large columnar grains, melt pools, and cellular structures. The morphology of these microstructural features stems from the directional solidification, high solidification rates, and cyclic thermal cycles during selective laser melting. The objective of this study was to identify the formation mechanisms of the microstructure of the selective laser melted CoCrFeMnNi alloy at the macro, micro and sub-micron scales via light microscopy, scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) observations. The details of this work will be presented at the conference.