Ultra strong and ductile eutectic high entropy alloy fabricated by selective laser melting

With important application prospects, eutectic high entropy alloys have received extensive attention for their excellent strength and ductility in a large temperature range. The excellent casting characteristics of eutectic high entropy alloys make it possible to achieve well manufacturability of selective laser melting. For the first time, we have achieved crack-free eutectic high entropy alloy fabricated by selective laser melting, which has excellent mechanical properties in a wide temperature range from -196 °C to 760 °C due to ultra-fine eutectic lamellar spacing of 150–200 nm and lamellar colony of 2–6 μm. Specifically, the room temperature tensile strength exceeds 1400 MPa and the elongation is more than 20%, which significantly improved compared with those manufactured by other techniques with lower cooling rate.