Additive manufacturing of FCC-based high entropy alloys

Abstract

Among various newly emerging advanced engineering materials, high entropy alloys (HEAs) have attracted industries and academia in the past few years. Conventional alloys are usually based on one principal element, with small fractions of other elements added to enhance the properties. By contrast, HEAs have at least five or more principal elements, and the concentration of each element is between 5 and 35 wt. %. HEAs possess a combination of excellent mechanical properties, high-temperature strength, corrosion, and wear resistance. The stable solid solution phases in HEAs are achieved on account of relatively higher configurational entropy of mixing. The good microstructural stability makes it feasible to synthesize processes, analyze, and manipulate as per the application requirement. With the versatile manufacturing technique with low processing time, material, and shape design freedom, additive manufacturing (AM) possesses viability to fabricate HEAs. In recent years, FCC-based HEAs have become popular in academic research owing to their high toughness and ductility. However, the in-situ alloying with certain elements has been carried out to improve the mechanical strength of the FCC-based HEAs. This chapter reports previous studies on AM processing, post-processing, element composition design, and in-situ alloying of various FCC-based HEAs, along with their microstructural and mechanical properties. © 2025 Apple Academic Press, Inc. All rights reserved.