Corrosion fatigue behavior and mechanism of Mg-Zn-Zr-Nd alloy in protein-containing simulated body fluid

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-09-21 DOI:10.1016/j.ijfatigue.2025.109303

Jinjin Liu , Hongyan Tang , Lili Tan , Qiang Wang , Song Zhang , Jia Ma

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Abstract

Corrosion fatigue failure caused by the combined influences of cyclic stress and body fluids greatly limits the clinical applications of Mg alloys. Consequently, understanding the corrosion-fatigue behavior of these materials in protein environments is crucial. This study aims to investigate the corrosion fatigue (CF) behavior of Mg-Zn-Zr-Nd alloys in different protein concentration environments (20 g/L and 40 g/L). Static corrosion tests were performed to assess the effects of protein concentration on pit formation and early-stage damage of the alloy. The results indicated that the corrosion susceptibility of the Mg alloy exhibited a marked increase with higher concentrations of BSA. Fractographic analysis reveals that fatigue cracks originated from microcracks in the air, while in the protein-containing environment, cracks initiated from both microcracks and corrosion pits. The fatigue limit (σ_f) of the samples in HBSS was significantly higher than that in HBSS containing BSA. This phenomenon is attributed to the chelation of metal cations by amino acids in BSA, which interferes with the formation of the Ca-P protective layer, thus accelerating the fatigue damage process.

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Mg-Zn-Zr-Nd合金在含蛋白质模拟体液中的腐蚀疲劳行为及机理

循环应力和体液共同作用导致的腐蚀疲劳失效极大地限制了镁合金的临床应用。因此，了解这些材料在蛋白质环境中的腐蚀疲劳行为是至关重要的。本研究旨在研究Mg-Zn-Zr-Nd合金在不同蛋白质浓度环境（20 g/L和40 g/L）下的腐蚀疲劳行为。通过静态腐蚀试验，评估了蛋白质浓度对合金坑形成和早期损伤的影响。结果表明，随着BSA浓度的增加，镁合金的腐蚀敏感性显著提高。断口分析表明，疲劳裂纹在空气环境中由微裂纹引起，而在含蛋白质环境中，裂纹由微裂纹和腐蚀坑共同引起。HBSS试样的疲劳极限（σf）显著高于含BSA的HBSS试样。这种现象是由于BSA中氨基酸与金属阳离子的螯合作用，干扰了Ca-P保护层的形成，从而加速了疲劳损伤过程。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.