An efficient pores suppression process design method for high strength BCC high entropy alloys via powder bed fusion

Abstract

The optimization of the powder bed fusion (PBF) parameters is always an important part of a new alloy forming process, especially in the field of high-entropy alloys (HEAs). In this work, based on the extraction of molten pool feature, a kind of efficient process design method for pores suppression is proposed and eliminates the pores generated during the PBF process for a new Nb30Mo10Ta30Ti20Ni10 HEA whose tensile strength and elongation can reach 1.46 GPa and 5.5 %, respectively, after the optimization process. The high strength of this HEA is not only due to the high Archimedes' density but also the high grain boundary density ρ, which causes a proportion of the heat transfer interface of the molten pool. Therefore, as a guide for the PBF process, the proposed pores suppression process design method is benefit for finding the performance limits of HEAs, which are always hidden by non-optimal processes.