Life degradation and damage mechanism of ZL114A aluminum alloy under pre-corrosion fatigue in simulated tropical marine atmospheric environment

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2025-01-02 DOI:10.1016/j.ijfatigue.2024.108790

Changkai Wang, Yuting He, Teng Zhang, Tianyu Zhang, Jinhui Fu

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Abstract

This paper investigated the corrosion damage and fatigue fracture mechanisms of ZL114A cast aluminum alloy through laboratory pre-corrosion fatigue test conducted under simulated tropical marine humid-hot atmosphere. Additionally, based on the analysis results of surface casting defect equivalence and material damage mechanism, three types of fatigue life degradation models for this cast aluminum alloy after pre-corrosion were proposed. The results show that the primary corrosion damage modes of the material in the laboratory’s accelerated corrosion environment are corrosive pitting and intergranular corrosion because of the enriched Si phase in the grain boundary. The fatigue life of pre-corroded specimens exhibits three stages of degradation characterized by initial decline stage; horizontal stage; secondary decline stage, correlating with increasing corrosion time. The primary factors behind this phenomenon are hydrogen embrittlement and the competing effects of surface casting defects and intergranular corrosion on the initiation of fatigue cracks. The fitting results of the three types of pre-corrosion fatigue life degradation models are better than the traditional models.

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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.