Corrosion fatigue behavior of a Mg-9Gd alloy under different glucose concentrations

IF 7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-13 DOI:10.1016/j.ijfatigue.2025.109437

Yiwen Xu , Hongyan Tang , Yi Zhang , Yan Fang , Rim Khizzou , Qiang Wang , Song Zhang , Tao Zhang , Jia Ma

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Abstract

Under physiological conditions, Mg alloy bone implants are subjected to mechanical stress and corrosion. Consequently, developing practical clinical applications, understanding the corrosion fatigue (CF) behavior of Mg alloy is crucial. The Mg alloys is presented with a new challenge by the rising prevalence of metabolic disorders such as diabetes, as the high-glucose environment can adversely affect their behavior. This study investigates the CF behavior of the Mg-9Gd-2Nd-0.5Zr-0.5In alloy (designated as Mg-9Gd) in a simulated high-glucose environment, with particular emphasis on the influence of glucose concentrations (1 g/L and 3 g/L) on its CF lifespan. To elucidate the underlying degradation mechanisms, complementary static corrosion tests were performed. The results show that the synergistic effect of cyclic loading and corrosive media substantially accelerates CF failure, particularly at higher glucose concentrations. Fractographic analysis reveals that fatigue cracks initiate at surface pits caused by localized corrosion and propagate in a brittle manner. Additionally, the static corrosion tests reveal that the oxidation of glucose combined with Cl⁻ destabilizes the corrosion product layer on the alloy surface, further intensifying localized corrosion. This disruption enhances pitting, which facilitates crack initiation and reduces fatigue life.

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不同葡萄糖浓度下Mg-9Gd合金的腐蚀疲劳行为

在生理条件下，镁合金骨种植体承受机械应力和腐蚀。因此，开发实际临床应用，了解镁合金的腐蚀疲劳（CF）行为至关重要。随着糖尿病等代谢紊乱的日益流行，高糖环境会对镁合金的行为产生不利影响，这对镁合金提出了新的挑战。本研究研究了Mg-9Gd- 2nd -0.5 zr -0.5 in合金（简称Mg-9Gd）在模拟高糖环境下的CF行为，特别强调了葡萄糖浓度（1 g/L和3 g/L）对其CF寿命的影响。为了阐明潜在的降解机制，进行了互补的静态腐蚀试验。结果表明，循环加载和腐蚀介质的协同作用显著加速了CF的破坏，特别是在较高的葡萄糖浓度下。断口分析表明，疲劳裂纹起源于局部腐蚀引起的表面凹坑，并以脆性方式扩展。此外，静态腐蚀试验表明，葡萄糖与Cl−的氧化使合金表面腐蚀产物层不稳定，进一步加剧了局部腐蚀。这种破坏增强了点蚀，促进了裂纹的形成，降低了疲劳寿命

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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.