High-strength Fe32Cr33Ni29Al3Ti3 fabricated by selective laser melting
Xiaojun Tan, Donghui Chen, Jianbo Xu, Haitao Chen, Xuyun Peng, Guo Liang, Haibing Xiao, Qingmao Zhang
Abstract
Additive manufacturing of high entropy alloys (HEAs) has attracted increasing interest. A high-strength Co-free HEA with eutectic structure was developed using selective laser melting (SLM) technology in this work. This material shows excellent mechanical properties over a wide temperature range, from 25 °C to 500 °C, owing to its ultra-fine eutectic cellular structure with BCC phase wrapped by FCC phase. Specifically, the Co-free HEA exhibits a room temperature tensile strength exceeding 1200 MPa, and a yield strength of more than 880 MPa. The strength results of this Co-free HEA represent a significant improvement compared to other Co-free HEAs or middle entropy alloys (MEAs) manufactured using SLM. Given their low cost, Co-free HEAs are highly promising for commercial large-scale applications, and this research suggests that this high-strength Co-free HEA with eutectic structure may have particular value in SLM manufacturing mold applications.