Enhanced strength but deteriorated fatigue crack propagation behaviors of an aviation Al-Li alloy sheet caused by solid-solution time extension

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-01-31 DOI:10.1016/j.ijfatigue.2025.108853

Xu-feng Cai , Hui Xiang , Zhen-zhen Liu , Guang-jun Zeng , Tian-le Liu , Zhi-min Cai , Hua Zhou , Bao Qi , Dan-Yang Liu , Jin-feng Li

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引用次数: 0

Abstract

The fatigue crack propagation (FCP) property and strength in T8-aged Al-Li alloy sheets with varying solid-solution time were investigated and the influence mechanism of the secondary phase on fatigue crack initiation was revealed. The results demonstrate that both grain dimension and recrystallization texture of the alloys with different solid-solution time are similar, but the average diameter of secondary phase particles decreases nearly monotonically with solid-solution time extension. The prolongation of solid-solution time leads to higher number density and size of T₁ precipitates during T8 aging due to the increased solute concentration, which enhances the strength and exacerbates the stress concentration in the plastic zone ahead of fatigue crack tip. While the homogeneously distributed fine dispersed phase particles separate from the matrix and form the site for crack initiation when the stress in the plastic zone reaches a relatively high level. The crack initiation sites provide highways for main crack propagation which accelerates the FCP. Consequently, prolonging the solid-solution time further facilitates the crack initiation process caused by the dispersed phase particles, and renders the FCP rate much higher at the rapid propagation stage.

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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.