Improved material properties of wire arc additively manufactured Al-Zn-mg-cu alloy through severe deformation interlayer friction stir processing and post-deposition heat treatment

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-22 DOI:10.1016/j.matchar.2024.114487

Ji Liu , Yugang Miao , Ruizhi Wu , Chao Wei , Yuyang Zhao , Yifan Wu , Qingwen Deng

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引用次数: 0

Abstract

In this study, Al-Zn-Mg-Cu alloys were prepared by wire arc additive manufacturing (WAAM) combined with interlayer friction stir processing (IFSP). To enhance the FSP region, an improved stirring pin was designed to broaden the stir zone effectively. Moreover, the effects of typical T6 and T73 heat treatments on the microstructure and mechanical properties of as-deposited (AS) specimen were meticulously investigated. The results indicated that heat treatments had minimal impact on grain size, dislocation density, and texture strength, but significantly altered the type, size, and distribution of precipitates. The differences in strength were primarily attributed to precipitation strengthening rather than grain boundary or dislocation strengthening. Following T6 heat treatment, the precipitates were predominantly η’, which were smaller in size and exhibited a significantly increased number density compared to AS specimen. Therefore, the average yield strength (YS) and ultimate tensile strength (UTS) increased by 39.51 % (500.21 MPa) and 15.84 % (584.26 MPa), respectively. In contrast, T73 treatment caused a substantial number of fine η’ to transform into coarser η, leading to a significant decrease in precipitate number density. Consequently, compared to T6 specimen, the average YS and UTS decreased by 47.19 % and 13.13 %, respectively.

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通过严重变形层间摩擦搅拌加工和沉积后热处理改善线弧快速成型铝锌镁铜合金的材料性能

本研究通过线弧快速成型（WAAM）结合层间摩擦搅拌加工（IFSP）制备了铝-锌-镁-铜合金。为了增强 FSP 区域，设计了一种改进的搅拌销，以有效扩大搅拌区域。此外，还仔细研究了典型的 T6 和 T73 热处理对沉积试样（AS）微观结构和机械性能的影响。结果表明，热处理对晶粒大小、位错密度和质地强度的影响很小，但对析出物的类型、大小和分布却有显著的改变。强度差异主要归因于析出强化，而不是晶界或位错强化。经过 T6 热处理后，析出物主要是 η'，与 AS 试样相比，析出物的尺寸更小，数量密度显著增加。因此，平均屈服强度（YS）和极限抗拉强度（UTS）分别提高了 39.51 %（500.21 兆帕）和 15.84 %（584.26 兆帕）。相比之下，T73 处理使大量细小的 η' 转变为较粗的η，导致沉淀数量密度显著下降。因此，与 T6 试样相比，平均 YS 和 UTS 分别下降了 47.19 % 和 13.13 %。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.