组织对Al-Zn-Mg合金搅拌摩擦焊接接头疲劳裂纹扩展行为的影响

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-06-11 DOI:10.1016/j.jallcom.2025.181551

Fuqiang Guo , Wenyu Liu , Shuwei Duan , Kenji Matsuda , Xuemei Liu , Yong Zou

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引用次数: 0

摘要

制备了Al-Zn-Mg合金AA7N01搅拌摩擦焊接（FSW）接头，研究了接头不同区域的疲劳裂纹扩展行为，并分别分析了塑性变形、第二相颗粒和晶粒取向对FCP行为的影响。结果表明：FSW接头在不同部位对FCP的阻力不同；基材（BM）中晶粒的高塑性导致了FCP的高阻力，疲劳裂纹主要沿晶界和{111}滑移面扩展。熔核区（NZ）具有许多具有相同延伸方向的细小晶粒，这些晶界可以形成裂纹扩展通道并使裂纹发生转动。超前侧nz （AS-NZ）的晶粒取向非常明显，连续的lagb可以形成快速的裂纹扩展路径，因此FCP率在AS-NZ中最高。后退侧nz （RS-NZ）中出现了大量大晶粒、小晶粒和第二相颗粒，它们改变了裂纹方向，加速了FCP速率。

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Influence of microstructures in fatigue crack propagation behavior of Al-Zn-Mg alloy friction stir welded joint

The friction stir welding (FSW) joints of Al-Zn-Mg alloy AA7N01 were prepared, the fatigue crack propagation (FCP) behavior of different regions of joint were studied, and the effects of plastic deformation, second phase particles and grain orientation on the FCP behavior were analyzed separately. The results show that FSW joint exhibit different resistance for FCP in different region of the joint. The high plasticity of grains in base material (BM) can lead to a high resistance for FCP, and the fatigue cracks mainly extend along grain boundaries and {111} slip planes. Nugget zone (NZ) exhibits many fine grains with the same elongation direction, and those grain boundaries can form crack propagation channels and turn the crack. Advancing side-NZ (AS-NZ) shows a very obvious grain orientation, and the continuous LAGBs can form fast pathways for crack propagation, thus the FCP rate is highest in AS-NZ. Retreating side-NZ (RS-NZ) exhibits many large grains, small grains and second phase particles, which can change crack direction and accelerate the FCP rate.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.