Microstructure and mechanical properties of wire-arc directed energy deposited Al-Mg-Sc aluminum alloy: As-deposited and aging heat treated

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications Pub Date : 2024-05-23 DOI:10.1177/14644207241255197

Jiayuan Cui, Xinpeng Guo, Shuai Hao, Yuanzheng Zhao, Xuming Guo

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Abstract

In this study, Al-Mg-Sc aluminum alloys were fabricated using wire-arc directed energy deposition. The focus of the study was to analyze the microstructure and mechanical properties of these alloys. Comparative analysis was conducted on the samples obtained from the as-deposited and aging treated, respectively. Furthermore, the precipitation process of the second phases and the associated strengthening mechanism were elucidated. The findings revealed that the presence of precipitated Al3(Sc,Zr) particles acted as heterogeneous nucleation nuclei of α-Al, facilitating the formation of equiaxial grains. During the subsequent aging treatment, the secondary Al3(Sc,Zr) particles precipitated directly without transitioning through intermediate phases. Additionally, the experimental results demonstrated that these secondary Al3(Sc,Zr) phases hindered the dislocation movement, leading to enhanced mechanical properties in Al-Mg-Sc alloys through precipitation strengthening. In the horizontal direction, the average ultimate tensile strength (UTS) and yield strength (YS) were measured as 361 ± 5 MPa, 251 ± 4 MPa, and 281 ± 6 MPa, 179 ± 6 MPa in the vertical direction, respectively. The elongations were found to be 15.8 ± 0.8% and 4.0 ± 0.5% in the horizontal and vertical directions, respectively. The observed variations in mechanical properties were attributed to the presence of interlayer pores.

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线弧定向能沉积 Al-Mg-Sc 铝合金的微观结构和机械性能：砷沉积和时效热处理

本研究采用线弧定向能沉积法制造了铝镁钪铝合金。研究的重点是分析这些合金的微观结构和机械性能。分别对沉积和时效处理后的样品进行了对比分析。此外，还阐明了第二相的析出过程和相关的强化机制。研究结果表明，析出的 Al3（Sc，Zr）颗粒是 α-Al 的异质成核，促进了等轴晶粒的形成。在随后的老化处理过程中，二次 Al3（Sc，Zr）颗粒直接析出，没有经过中间相的转变。此外，实验结果表明，这些次生 Al3（Sc，Zr）相阻碍了位错运动，从而通过沉淀强化提高了 Al-Mg-Sc 合金的机械性能。在水平方向上，测得的平均极限抗拉强度（UTS）和屈服强度（YS）分别为 361 ± 5 MPa、251 ± 4 MPa，在垂直方向上分别为 281 ± 6 MPa、179 ± 6 MPa。水平和垂直方向的伸长率分别为 15.8 ± 0.8% 和 4.0 ± 0.5%。观察到的机械性能变化归因于层间孔隙的存在。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 工程技术-材料科学：综合

CiteScore

4.70

自引率

8.30%

发文量

166

审稿时长

3 months

期刊介绍： The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).