Dual-edged effect of strengthening on fatigue strength in 7xxx Al alloys

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-07-14 DOI:10.1007/s40843-025-3466-1

Renjie Dai (, ), Zhenjun Zhang (, ), Rui Liu (, ), Jiapeng Hou (, ), Baishan Gong (, ), Zhenkai Zhao (, ), Zhenyu Liu (, ), Zongyi Ma (, ), Zhefeng Zhang (, )

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Abstract

The relationship between tensile and fatigue properties in Al alloys remains vague because strengthening often affects the fatigue damage in many aspects. In this study, 7xxx Al alloys were strengthened solely by varying the precipitate content while keeping both the overall microstructure and damage mechanisms consistent, so as to examine the intrinsic effect of strengthening on its fatigue performance. The results show that there was an increment of 100 MPa in tensile strength, while the fatigue strength remained nearly unchanged. Further analysis indicates that the strengthening had a dual-edged effect, that is, strengthening enhanced the whole resistance to plastic deformation, while also causing the strain localization. Combining our previous models associated with the tensile and fatigue properties, a relationship between yield and fatigue strengths is established, which shows a first increasing and then declining trend in the fatigue strength with increasing the yield strength, leaving a relatively stable region in between, which explains the plateau phenomenon of fatigue strength in a middle yield strength range for the high-strength 7xxx alloys.

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强化对7xxx铝合金疲劳强度的双刃效应

铝合金的拉伸性能与疲劳性能之间的关系尚不明确，因为强化往往会在许多方面影响疲劳损伤。本研究仅通过改变析出相含量对7xxx铝合金进行强化，同时保持整体显微组织和损伤机制一致，以检验强化对其疲劳性能的内在影响。结果表明，拉伸强度增加了100 MPa，而疲劳强度基本保持不变。进一步分析表明，强化具有双刃剑效应，即强化在增强整体抗塑性变形能力的同时，也造成了应变局部化。结合前人的抗拉疲劳模型，建立了屈服强度与疲劳强度之间的关系，随着屈服强度的增加，疲劳强度呈现先上升后下降的趋势，两者之间留有一个相对稳定的区域，这解释了高强度7xxx合金在屈服强度中间区间的疲劳强度平台现象。

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

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.