The unique solidification behaviour in metal additive manufacturing (AM), can lead to hot cracking, significantly compromising the mechanical properties of the alloys. In this study, grain boundary segregation engineering was employed, using boron (B) as a segregant, to investigate the effects of varying B concentrations on the microstructure and properties of CoCrNi medium-entropy alloys (MEAs). It was demonstrated that B gradually segregated along the grain boundaries, which improved the grain coalescence, intensified the attraction of the columnar grains, and increased the consumption of th...
