Correlation of slip behavior, strain evolution and fatigue crack growth retardation

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-07 DOI:10.1016/j.ijfatigue.2025.108974

Rong Chen , Gao-Ming Zhu , Ming-Liang Zhu , Fu-Zhen Xuan

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Abstract

To evaluate the intrinsic mechanisms underlying fatigue crack growth retardation behavior, crack initiation and early growth behavior at the notch were monitored using in-situ SEM in a magnesium alloy. The evolution of crack-tip plastic strain and the associated microstructural damage were quantitatively characterized by EBSD and DIC. Results demonstrate that the crack growth rate followed a V-shaped pattern of decreasing before increasing, which could be correlated with strain field and slip activation. The strain decreasing zone was found originated from dynamic transfer of compressive strain near the crack-tip, while the strain appeared a positive correlation with fatigue crack growth rate in both retardation and recovery regimes. Both the retardation and recovery processes were grain orientation dependent, and the transition to recovery was assisted by the enhanced basal slip transfer. The findings offer a novel perspective on transient cracking behavior, guiding the fatigue-resistant design of magnesium alloys.

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滑移行为、应变演变和疲劳裂纹生长延迟的相关性

为了评价镁合金疲劳裂纹扩展迟滞行为的内在机制，采用原位扫描电镜对镁合金缺口处的裂纹萌生和早期扩展行为进行了监测。利用EBSD和DIC定量表征了裂纹尖端塑性应变的演变过程和相关的显微组织损伤。结果表明：裂纹扩展速率呈先减小后增大的“v”型，与应变场和滑移激活有关；应变减小区源于裂纹尖端附近压缩应变的动态传递，而在迟滞和恢复状态下，应变与疲劳裂纹扩展速率均呈现正相关关系。阻滞和恢复过程都依赖于晶粒取向，向恢复的过渡是由增强的基底滑移转移辅助的。研究结果为研究镁合金的瞬态开裂行为提供了新的视角，指导了镁合金的抗疲劳设计。

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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.