直接时效对激光-粉末床熔合异质组织A20X合金力学性能的影响

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
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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引用次数: 0

摘要

采用直接时效(DA)这一省去固溶处理步骤的后热处理工艺,研究了其对激光粉末床熔合(LPBF)制备A20X铝合金组织和力学性能的影响。在构建的(AB)微观结构中,以富集Ti和cu的细胞边界为特征的化学非均质性,促进了DA过程中纳米析出物的快速形成。随着时效时间的延长,Ω相和θ′相的大小和密度逐渐增大,析出始于晶胞边界,并向基体中扩散。与AB条件相比,DA条件下拉伸强度略有提高;然而,过长的时效时间由于沿晶胞边界的析出物过度粗化而导致强度降低。此外,时效还减缓了动态应变时效,锯齿状流动的频率降低,导致全时效试样的延性恢复。这些发现强调了DA在定制LPBF A20X合金力学性能方面的关键作用,为优化高强度铝增材制造部件提供了简化的途径。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.

Graphical abstract

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来源期刊
Metals and Materials International
Metals and Materials International 工程技术-材料科学:综合
CiteScore
7.10
自引率
8.60%
发文量
197
审稿时长
3.7 months
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.
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