Yu Zou1
University of Toronto1
Eutectic high entropy alloys (EHEA) with alternating FCC and BCC-based phases offer an excellent combination of strength and ductility. AM allows for the fabrication of ultrafine nanolamellar EHEA with directional growth. In this study, we investigate the effect of orientation on the deformation, strengthening, and fracture mechanisms of directional EHEA manufactured by additive manufacturing using in situ synchrotron-based high-energy X-ray diffraction during tensile test. Our findings show that the sample along the lamellar direction exhibits the best combination of strength and ductility due to the continuous stimulated strengthening ability of the B2 and FCC phases in the near equal strain condition. The strengthening of the B2 phase is mainly caused by the formation of martensitic phases, while the strengthening of the FCC phase is mainly caused by back stress. Additionally, the sample shows higher crack and void tolerance than the other samples. Our research sheds light on a better understanding of the co-deformation behavior of dual-phase EHEAs made by AM.