Fatigue crack propagation behavior of 2195 Al-Li alloy plate at low temperature

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2025-02-20 DOI:10.1016/j.ijfatigue.2025.108890

Yingzhi Li, Cunsheng Zhang, Zinan Cheng, Zijie Meng, Liang Chen, Guoqun Zhao

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引用次数: 0

Abstract

Great attention has been attached to Al-Li alloys due to their excellent performance for aerospace structural components, which endure low-temperature environments and cyclic loads, posing intense demands on the fatigue resistance of materials. In this work, the fatigue crack propagation (FCP) behaviors at low temperatures (−80 °C) of as-rolled 2195 Al-Li alloy have been investigated and compared with those at room temperature. It was found that the influence of grain boundaries and secondary phase particles on FCP is direction-dependent: both of them accelerate FCP in the parallel rolling direction (TL) and impede FCP in the perpendicular rolling direction (LT). Meanwhile, the grains with high Schmid factors have an attractive effect on the FCP path, but this effect diminishes at low temperature. The weakened dislocation movement at low temperature impedes cracks from entering the grains and propagating along the slip planes, resulting in crack deflection and propagation along grain boundaries. This mechanism retards the rate of FCP and significantly enhances the fatigue resistance of Al-Li alloys at low temperature.

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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.