腐蚀与疲劳交替作用下ZL114A铝合金损伤机理分析及疲劳影响因子计算方法

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-03-28 DOI:10.1016/j.ijfatigue.2025.108951

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

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引用次数: 0

摘要

对航空工业常用的ZL114A铸造铝合金进行了模拟热带海洋大气环境下的室内交变腐蚀/疲劳试验。研究了这些材料在不同试验参数下的寿命退化规律。此外，利用透射电镜（TEM）对铝合金的晶间腐蚀和疲劳裂纹尖端形貌进行了观察和分析，并提出了腐蚀环境和疲劳载荷交替作用下铝合金的损伤机理模型。结果表明：ZL114A铝合金在腐蚀/疲劳交替试验中主要的腐蚀损伤模式为晶间腐蚀。晶界处共晶Si相为阴极，α-Al相为阳极。疲劳载荷在晶间腐蚀尖端诱发位错积累，导致基体与二次相界面分离。另一方面，疲劳载荷促进了腐蚀后晶界的开裂，最终导致疲劳裂纹的萌生。交变试验中疲劳裂纹的起裂时间对试样的疲劳寿命有较大影响。当腐蚀阶段的持续时间（ΔT）和疲劳试验阶段的载荷循环次数（ΔN）相对较小时(ΔT <；72小时，ΔN <；在相同腐蚀时间下，材料在交替过程中没有产生疲劳裂纹，最终阶段疲劳寿命与预腐蚀后的疲劳寿命相当。当ΔN较大时，交变试验阶段产生疲劳裂纹，末阶段疲劳寿命急剧下降。推导了ZL114A铝合金在任意ΔT和ΔN条件下的腐蚀/疲劳交变试验中疲劳影响因子的计算公式。

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Damage mechanism analysis and fatigue impact factor calculation method for ZL114A aluminum alloy under the alternating effects of corrosion and fatigue

A laboratory alternating corrosion/fatigue test conducted under a simulated tropical marine atmospheric environment has been carried out for ZL114A cast aluminum alloy, which is commonly used in the aviation industry. The life degradation law of these materials under different test parameters was studied. In addition, transmission electron microscopy (TEM) was utilized to observe and analyze the intergranular corrosion and fatigue crack tip morphologies, and then used to propose a damage mechanism model for aluminum alloy under the alternating action of a corrosive environment and fatigue loads. Our results showed that the predominant corrosion damage mode for ZL114A aluminum alloy in the alternating corrosion/fatigue test was intergranular corrosion. The eutectic Si phase at the grain boundaries served as the cathode, while α-Al underwent dissolution as the anode. The fatigue load induced dislocation accumulation at the tip of the intergranular corrosion, causing separation of the interface formed between the matrix and secondary phase. On the other hand, the fatigue load promoted cracking of the grain boundaries after corrosion, which ultimately resulted in the initiation of fatigue cracks. The initiation time for the fatigue cracks during the alternating test had a considerable effect on the fatigue life of the samples. When durations of the corrosion stage (ΔT) and numbers of load cycles during the fatigue testing stage (ΔN) were relatively small (ΔT < 72 h, ΔN < 30,000 cycles), no fatigue cracks were initiated during the alternating process and the final stage fatigue life of the material was comparable to the fatigue life after pre-corrosion for the same corrosion time. When ΔN was large, fatigue cracks were initiated during the alternating test and a sharp drop occurred in the final stage fatigue life. The calculation formula for the fatigue impact factor of ZL114A aluminum alloy during the corrosion/fatigue alternating test under any ΔT and ΔN conditions was deduced.

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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.