Crystallographic orientation-dependent deformation characteristics of additive manufactured interstitial-strengthened high entropy alloys

In this study, laser powder bed fusion (LPBF) was used for the fabrication of an interstitial-strengthened high entropy alloy (iHEA), Fe 49.5 Mn 30 Co 10 Cr C 0.5 (at.%). The as-fabricated iHEA possesses excellent strength-ductility synergy during tensile loading, with fracture strength reaching up to 1109 MPa at 37% engineering strain. Electron backscatter diffraction (EBSD) and energy synchrotron X-ray were evaluate microstructural characteristics material. In-situ EBSD analysis uniaxial testing performed unveil deformation mechanisms. Moreover, crystallographic orientation-specific micropillar compression tests conducted determine how grain differ between orientations. Due activation multiple slip systems homogeneous plastic flow, [111] orientation demonstrated a higher yield continuous work hardening rate. This research helps in clarifying contributions bulk mechanical response additively manufactured HEA.