Effects of solution temperature on microstructure and mechanical properties of Al-Si-Mg aluminum alloy fabricated by wire-arc additive manufacturing

IF 2.3 4区工程技术 Q2 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Pub Date : 2024-05-29 DOI:10.1177/09544089241257792

Guoqing Chen, Zhanwei Zhang, Yuanzheng Zhao, Xuming Guo

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Abstract

Al-Si-Mg aluminum alloys exhibit excellent machinability as heat-treatable strengthened aluminum alloys. Heat treatment has a great influence on the microstructure and mechanical properties of Al-Si-Mg aluminum alloys. In this study, the ZL114A aluminum alloy wire was used to fabricate the Al-Si-Mg thin-walled component based on the wire-arc additive manufacturing process of metal inert-gas welding. The microstructure and mechanical properties of the ZL114A aluminum alloy components were investigated in both the as-deposited and heat treated at different solution temperatures. The results indicated that the microstructure of as-deposited ZL114A aluminum alloys consisted mainly of dendrites. The dendritic morphology disappeared after solid solution treatment (ST) at different temperatures, and the eutectic Si phase appeared coarsened and spheroidized. Numerous β″ phases were observed to have precipitated within the grains by transmission electron microscopy. The tensile properties of the alloy were improved due to precipitation strengthening of the β″ phase and spheroidization of the eutectic silicon phase. After the solid ST at 540 °C for 9 h and artificial aging treatment at 170 °C for 8 h, the yield strength and ultimate tensile strength of the alloy reached the maximum values of 344 and 377 MPa, respectively.

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溶液温度对线弧快速成型技术制造的铝硅镁合金微观结构和机械性能的影响

铝硅镁铝合金作为一种可热处理的强化铝合金，具有出色的机械加工性能。热处理对 Al-Si-Mg 铝合金的微观结构和机械性能有很大影响。本研究使用 ZL114A 铝合金线材，基于金属惰性气体焊接的线弧快速成型制造工艺，制造了铝-硅-镁薄壁部件。研究了 ZL114A 铝合金部件在敷镀和不同固溶温度下热处理时的微观结构和机械性能。结果表明，未轧制的 ZL114A 铝合金的微观结构主要由树枝状晶组成。在不同温度下进行固溶处理（ST）后，树枝状形态消失，共晶硅相出现粗化和球化。透射电子显微镜观察到晶粒内析出了大量的 β″ 相。由于β″相的沉淀强化和共晶硅相的球化，合金的拉伸性能得到了改善。在 540 °C 下固态 ST 9 小时和 170 °C 下人工时效处理 8 小时后，合金的屈服强度和极限抗拉强度分别达到了 344 和 377 兆帕的最大值。

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 E: Journal of Process Mechanical Engineering 工程技术-工程：机械

CiteScore

3.80

自引率

16.70%

发文量

370

审稿时长

6 months

期刊介绍： The Journal of Process Mechanical Engineering publishes high-quality, peer-reviewed papers covering a broad area of mechanical engineering activities associated with the design and operation of process equipment.