Schematic of introducing precipitation-hardening in additive manufacturing
Composites Part B: Engineering. 2024 281 (111570).
The selection and preparation of base materials are important for producing MSFSSs, in which the mechanical behaviors, formability, and other functional characteristics must be compressively considered. In these regards, tailoring the fundamental properties of base materials becomes a promising solution to address above issues. Investigations of hot-spot materials viz. medium-entropy superalloy and high-entropy alloy were carried out, which were focused on introducing precipitation-hardening in additive manufacturing and strain hardening in non-recrystallized regions.
A cellular boundary engineering in the medium-entropy alloys within the FCC-system was proposed to improve mechanical performance at elevated temperatures. The medium-entropy alloy was processed by L-PBF coupled with ageing. The application of crystallize defect engineering can be facilitated by CoCrNi-based alloys exhibiting low stacking fault energy, and the coarsening of added particles formed in the existing systems is governed by short-range reshuffling, presenting good thermal stability. In addition, the formed fine cellular structures also exhibit excellent thermally stability and serve as strong barriers to dislocation motion, leading to superior mechanical performance. Therefore, introducing stable cellular structure engineering via compositional regulation is a novel method for load-bearing applications of at room and elevated temperatures.
