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

TL;DR

This paper reports the first crack-free eutectic high entropy alloy fabricated by selective laser melting, exhibiting exceptional strength and ductility across a wide temperature range due to ultra-fine lamellar microstructure.

Contribution

It demonstrates the successful fabrication of crack-free eutectic high entropy alloy via selective laser melting with superior mechanical properties and microstructure control.

Findings

Room temperature tensile strength exceeds 1400 MPa.

Elongation surpasses 20%.

Excellent mechanical performance over -196°C to 760°C.

Abstract

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 of -196 degrees Celsius~760 degrees Celsius due to ultra-fine eutectic lamellar spacing of 150 ~ 200nm and lamellar colony of 2 ~ 6 {\mu}m. Specifically, the room temperature tensile strength exceeds 1400MPa and the elongation is more than 20%, significantly improved compared with those manufactured by other techniques with lower cooling rate.