Improvement of LPBF processability of equiatomic MoNbTaTiZr RHEA powder by in-situ precipitation of boride particles.

[Display omitted] • Pure B particles in the RHEA powder allowed the in-situ precipitation of borides. • Borides limited the grain growth and led to a more homogeneous strain distribution. • Cracking susceptibility of the RHEA was reduced, improving LPBF processability. The equiatomic MoNbTaTiZr biocompatible and refractory high-entropy alloy (RHEA) was additively manufactured by laser powder bed fusion (LPBF). The possibility to reduce the cracking susceptibility of the RHEA during LPBF was investigated. By the addition of pure B to the RHEA powder feedstock, the in-situ precipitation of boride particles was promoted. These precipitates limited the grain growth, thus avoiding the formation of cracks. [ABSTRACT FROM AUTHOR]