Innovative heterostructure enhance mechanical strength and corrosion resistance in A356/6061 dissimilar aluminum alloy MIG welded joints

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-02-13 DOI:10.1016/j.vacuum.2025.114125

Yongheng Jiang , Shengguang Dai , Qifa Chen , Xiu Xin , Ziheng Song , Zhikai Chen , Chun Wu , Xin Ren , Chao Meng

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引用次数: 0

Abstract

Designing heterostructure (HS) is an effective approach to enhancing the metallic materials property. In this study, ultrasonic impact treatment (UIT) is used to construct gradient HS and bionic HS on the dissimilar Al alloy joints surface. The results indicate that after UIT, the size of grains and intermetallic compounds is refined and the dislocation density is increased, leading in a surface hardness increase of more than 50 %. After immersion in 3.5 wt% NaCl solution for 7 days, the strength and toughness of the as-welded sample decreased significantly, whereas the welded joint with HS maintained high strength with only a slight loss in toughness. Due to the combined effects of multiple strengthening mechanisms, the bionic HS welded joint has the best tensile properties under pre-corrosion conditions. Compared to the as-welded samples, the tensile strength, yield strength and elongation of the bionic HS welded joint are increased by 39.7 %, 57.3 % and 4 %, respectively. Additionally, UIT formed a high proportion of low angle grain boundaries and a compressive residual stress layer with a maximum of −194 ± 3 MPa, promoting the stable growth of dense passivation film, thereby enhancing the intergranular corrosion resistance and electrochemical corrosion property of the welded joint.

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.