Heterogeneity of interfacial microstructure and fracture behavior of friction plug welds for 2219-T87 AlCu alloy

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-02-20 DOI:10.1016/j.matchar.2025.114864

Bo Du , Minglin He , Wenshen Tang , Xinqi Yang , Jiang Yi , Shuai Wang

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Abstract

Bonding interface is the weakest zone in defect-free friction plug weld (FPW) of 2219 aluminum alloy. To elucidate the specific fracture mechanism, the bonding interface of the FPW joint was precisely sampled and detailed characterized in this study. The bonding interface exhibit a heterogeneous microstructure along the thickness direction of FPW joint. In the middle part of the bonding interface, the recrystallization is the most adequate and the grain size is smallest, due to the largest interfacial normal force compared with the upper and lower parts. More importantly, a coarse θ-phase layer is identified along the bonding interface in the lower part of the FPW joint. These coarse θ phases are mainly formed by the accumulation and growth of original θ phases in the matrix, due to the inadequate interfacial normal force in the lower part. Cracks are easily formed and expanded along this coarse θ-phase layer, eventually leading to the low ultimate tensile strength and elongation of the defect-free FPW joint.

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2219-T87 AlCu合金摩擦塞焊缝界面组织及断裂行为的非均匀性

焊接界面是2219铝合金无缺陷摩擦塞焊（FPW）的最薄弱区域。为了阐明具体的断裂机制，本研究对FPW接头的结合界面进行了精确采样和详细表征。结合界面沿FPW接头厚度方向呈现非均匀组织。在结合界面中部，由于界面法向力比上部和下部大，再结晶最充分，晶粒尺寸最小。更重要的是，在FPW接头的下部沿结合界面发现了一层粗糙的θ相层。这些粗θ相主要是由于下部界面法向力不足，原始θ相在基体中积累长大而形成的。沿粗θ相层容易形成和扩展裂纹，最终导致无缺陷FPW接头的极限抗拉强度和伸长率较低。

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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.