Gyumi Han, Young Hoon Jung, Minjae Baek, Yonghee Jo, Jeong Min Park, Dong Jun Lee, Hyoung Seop Kim, Jung Gi Kim
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Effect of Direct Aging on the Mechanical Properties of Heterostructured A20X Alloy Manufactured by Laser-Powder Bed Fusion
Direct aging (DA), a post-heat treatment process that omits the solution treatment step, was applied to study its effects on the microstructure and mechanical properties of an A20X aluminum alloy fabricated by laser powder bed fusion (LPBF). The chemical heterogeneity in the as-built (AB) microstructure, characterized by Ti- and Cu-enriched cell boundaries, facilitates the rapid formation of nanosized precipitates during DA. Precipitation initiated at the cell boundaries and progressed into the matrix, with the size and density of Ω and θ′ phases increasing with aging time. DA slightly enhanced tensile strength compared to the AB condition; however, excessive aging time led to strength reduction owing to excessive precipitate coarsening along the cell boundaries. Additionally, aging mitigated dynamic strain aging, as evidenced by the reduced frequency of serrated flows that results in the ductility recovery in the full-aged sample. These findings emphasize the critical role of DA in tailoring the mechanical properties of LPBF A20X alloys, offering a simplified pathway for optimizing high-strength aluminum additive manufacturing components.
期刊介绍:
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.