International Journal of Fatigue最新文献_第8页

Fatigue performance of Ti6Al4V lattices: relative density as a partial quantitative predictor Ti6Al4V晶格的疲劳性能：相对密度作为部分定量预测因子

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-16 DOI: 10.1016/j.ijfatigue.2025.109447

Pietro Foti , Asghar Heydari Astaraee , Sara Bagherifard , Anton du Plessis , Di Wan , Filippo Berto , Nima Razavi

{"title":"Fatigue performance of Ti6Al4V lattices: relative density as a partial quantitative predictor","authors":"Pietro Foti , Asghar Heydari Astaraee , Sara Bagherifard , Anton du Plessis , Di Wan , Filippo Berto , Nima Razavi","doi":"10.1016/j.ijfatigue.2025.109447","DOIUrl":"10.1016/j.ijfatigue.2025.109447","url":null,"abstract":"<div><div>Lattice structures realized through additive manufacturing have garnered increasing interest within both academia and industry in recent years. Various factors, including unit cell topology, base material, heat treatments, and relative density, significantly influence the overall behaviour of these architectured structures. This study specifically examines the compressive mechanical behaviour of solid-based gyroid lattices made of Ti6Al4V alloy through Laser Powder Bed Fusion (PBF-LB) technique. Specimens with four different relative densities were produced to investigate the impact of this parameter on the compressive behaviour (quasi-static and fatigue); furthermore, each relative density category included two sets of specimens to evaluate the effect of annealing and Hot Isostatic Pressing (HIP) as post-processing techniques. Micro-CT scans, microstructural, postmortem and finite element analyses were included to further evaluate the failure mechanisms and explain the observed experimental results. Furthermore, the behaviour documented in the present analysis has been correlated with a wide fatigue dataset retrieved from literature in an effort to dig deeper into the behaviour of these structures. The results, together with the retrieved dataset, allowed for a more comprehensive understanding also considering aspects such as yielding effect, surface roughness and notch mechanics. It has been proved that the use of optimized process parameters and cheaper heat treatments is able to match the beneficial effects expected by HIP. Furthermore, easy-to-use methodologies to account for the reduction in strength due to the change in relative density presented in the literature, such as effective and normalized stress, have been considered to evaluate their accuracy, but also their limitations.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109447"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermo-mechanical fatigue behavior and failure mechanisms of DZ125 superalloy considering effects of extremely high temperature ramp rates 考虑极高温度斜坡速率影响的DZ125高温合金热机械疲劳行为及失效机制

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-15 DOI: 10.1016/j.ijfatigue.2025.109443

Zhenlei Li , Bolin Li , Guo Li , Shaochen Bao , Lei Qi , Shuiting Ding

{"title":"Thermo-mechanical fatigue behavior and failure mechanisms of DZ125 superalloy considering effects of extremely high temperature ramp rates","authors":"Zhenlei Li , Bolin Li , Guo Li , Shaochen Bao , Lei Qi , Shuiting Ding","doi":"10.1016/j.ijfatigue.2025.109443","DOIUrl":"10.1016/j.ijfatigue.2025.109443","url":null,"abstract":"<div><div>The thermo-mechanical fatigue (TMF) behavior and failure mechanisms of hollow tubular DZ125 Ni-based superalloy specimens were investigated under a wide range of temperature change rates, ranging from 10 to 100°C/s. A novel TMF experimental system was developed, capable of achieving extremely high temperature ramp rates far higher than conventional tests. Isothermal fatigue (IF) tests at 1000 °C were also conducted for comparison. Results show that both cyclic strain response and fracture morphology are affected by temperature change rates. Compared to low rates, extremely high ramp rates caused large variability in fatigue life, as the cycles to failure increased by about 6.5 times on average when the rate increased from 10 ℃/s to 100 ℃/s. This trend was explained by an analytical framework of damage competition: at lower rates, creep damage dominates, thereby reducing the fatigue lives. A comparison between TMF and IF under the same frequencies shows that TMF tests exhibit stronger rate sensitivity than IF. This indicates that the life differences cannot be attributed to thermal variation alone, as temperature change rate is a significant factor. These findings demonstrate the necessity of considering temperature change rate in TMF failure, especially under extremely rapidly varying thermal environments.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109443"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An effective approach for identifying fatigue-critical defects from X-ray 3D reconstruction: Example in L-PBF AlSil0Mg alloys x射线三维重建识别疲劳临界缺陷的有效方法：以L-PBF AlSil0Mg合金为例

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-25 DOI: 10.1016/j.ijfatigue.2025.109457

Zhengkai Wu , Tianyu Qin , Jianguang Bao , Weijian Qian , Enrico Salvati , Shengchuan Wu , Rihan Da , Jiang Dong , Hiroyuki Toda

{"title":"An effective approach for identifying fatigue-critical defects from X-ray 3D reconstruction: Example in L-PBF AlSil0Mg alloys","authors":"Zhengkai Wu , Tianyu Qin , Jianguang Bao , Weijian Qian , Enrico Salvati , Shengchuan Wu , Rihan Da , Jiang Dong , Hiroyuki Toda","doi":"10.1016/j.ijfatigue.2025.109457","DOIUrl":"10.1016/j.ijfatigue.2025.109457","url":null,"abstract":"<div><div>Internal defects have been widely believed as the physical origins of fatigue crack initiation and growth in additively manufactured (AM) metals, and the specific defect that triggers final failure typically dictates the overall fatigue life of critical safety equipment. To this regard, reliable identification of such critical defects among numerous of these imperfections is essential for accurate fatigue life prediction and defect-tolerant design. In this study, we investigate the geometric and spatial nature of porosity defects in laser powder bed fusion AlSi10Mg alloys, including their size, position, morphology, and orientation, and attempt elucidating their effect on fatigue resistance using high-resolution X-ray computed tomography (X-CT) and post-mortem fractographic analysis. Recognizing that image-based finite element analysis can be computationally intensive and that conventional defect descriptor may not fully capture the complexity of defect geometry and spatial context, we propose an effective Critical Defect Ranking Function (CDRF) metric that quantitatively integrates defect size, location, morphology, and orientation directly from large 3D X-CT imaging data. An effective defect size is adopted to ensure physical consistency, with the enhanced detrimental effect of near-surface defects considered. The CDRF enables direct, automated identification and ranking of fatigue-critical defects, and demonstrates predictive correlation with post-mortem experimental results. This robust, non-destructive framework facilitates defect-based reliability assessment and quality assurance in AM components.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109457"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145845101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A few-shot learning framework for unified thermal aging life prediction using contrastive representation learning 基于对比表示学习的统一热老化寿命预测的几次学习框架

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-13 DOI: 10.1016/j.ijfatigue.2025.109439

Ziyu Cui , Xingyue Sun , Ruisi Xing , Kai Song , Xu Chen

{"title":"A few-shot learning framework for unified thermal aging life prediction using contrastive representation learning","authors":"Ziyu Cui , Xingyue Sun , Ruisi Xing , Kai Song , Xu Chen","doi":"10.1016/j.ijfatigue.2025.109439","DOIUrl":"10.1016/j.ijfatigue.2025.109439","url":null,"abstract":"<div><div>Accurate prediction of material fatigue life under long-term thermal aging conditions is crucial for ensuring the safe operation of equipment. However, due to the high cost of thermally aged materials, it is challenging to obtain sufficient experimental data for investigation. This study proposes a contrastive learning-based framework to extract robust feature representations from small-sample thermal aging data. Four architectures (ANN, GRU, 2D-CNN, and 1D-CNN) were employed to construct the feature encoder in conjunction with the SupCon loss function, using stress–strain hysteresis as input to generate unified feature representations across different aging durations. Results show that the ANN encoder significantly improves the performance of downstream fatigue life prediction tasks in extrapolation validation. Even when the downstream model is linear regression, it achieves the lowest <em>RMSE</em> and highest stability. UMAP dimensionality reduction reveals that the ANN encoder effectively captures strain amplitude-dominated feature distributions, reflecting the degradation process of the material.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109439"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crystallographic characteristics of fatigue crack propagation across α/β phase boundary in Zr-2.5Nb alloy Zr-2.5Nb合金疲劳裂纹跨α/β相扩展的晶体学特征

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2026-01-03 DOI: 10.1016/j.ijfatigue.2025.109480

Kangkai Song , Conghui Zhang , Tongguang Zhai , Wenguang Zhu , Shuaiyang Liu , Ruixuan Tian , Guoliang Liu , Jinping Wang

{"title":"Crystallographic characteristics of fatigue crack propagation across α/β phase boundary in Zr-2.5Nb alloy","authors":"Kangkai Song , Conghui Zhang , Tongguang Zhai , Wenguang Zhu , Shuaiyang Liu , Ruixuan Tian , Guoliang Liu , Jinping Wang","doi":"10.1016/j.ijfatigue.2025.109480","DOIUrl":"10.1016/j.ijfatigue.2025.109480","url":null,"abstract":"<div><div>Understanding fatigue crack propagation (FCP) in Zr-2.5Nb alloy is crucial for safely shutting down the reactor before crack propagation to instability. This study quantitatively investigated the FCP behavior in a α/β Zr-2.5Nb alloy in combination with four crystallographic parameters (geometric compatibility factor (m’), Schmidt factor (SF), effective driving force (D), and twist angle (<span><math><mtext>φ</mtext></math></span>)). The results indicated that the strength and initial crack propagation resistance were improved with the increase of the β-phase. However, the initial FCP rate increased when the α-martensitic transformation occurred in the β-phase. Quantitative analysis indicated that transgranular cracks propagate primarily along prismatic and pyramidal planes in α phase, while along the (1 1 0) and (1 1 1) planes in the β phase. Cracks propagated along the slip plane if SF >0.3 and D <0.7, but along the plane of maximum driving planes if D >0.7 and SF <0.3. FCP across the phase boundary was related to <span><math><mrow><mtext>φ</mtext><mspace></mspace></mrow></math></span> and m’; crack deflection was significantly observed at the phase boundary when <span><math><mtext>φ</mtext></math></span> > 40° and m’ < 0.4. Finally, the effects of residual β phase and martensitic transformation on the crack growth rate were discussed. This work contributes to understanding the critical role of the β phase in FCP within Zr alloys and provides new ideas for enhancing FCP resistance.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109480"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue behavior of laser powder bed fusion GH4169 superalloy using different heat treatment methods 激光粉末床熔合GH4169高温合金不同热处理方式的疲劳行为

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2026-01-03 DOI: 10.1016/j.ijfatigue.2025.109479

Tao Shi , Yadong Zhou , Ruiyang Li , Feng Zhang , Jingyu Sun , Guian Qian

引用次数: 0

Residual fatigue life and strength estimation of a thermoplastic mono-stiffener panel using FRF analysis 热塑性单加筋板残余疲劳寿命及强度的频响分析

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-11 DOI: 10.1016/j.ijfatigue.2025.109431

Niki Tsivouraki , Konstantinos Tserpes , Spilios Fassois , Ioannis Sioutis

{"title":"Residual fatigue life and strength estimation of a thermoplastic mono-stiffener panel using FRF analysis","authors":"Niki Tsivouraki , Konstantinos Tserpes , Spilios Fassois , Ioannis Sioutis","doi":"10.1016/j.ijfatigue.2025.109431","DOIUrl":"10.1016/j.ijfatigue.2025.109431","url":null,"abstract":"<div><div>This study introduces a hybrid numerical–experimental methodology for assessing the residual fatigue life and strength of a thermoplastic mono-stiffener panel through vibration-based analysis. Building on a previously established framework for thermoplastic coupons, the approach integrates compression quasi-static and compression–compression fatigue tests with finite element (FE) models developed in LS-Dyna explicit FE software. The FE models accurately capture pre- and post-fatigue quasi-static behavior, progressive delamination under cyclic loading, and dynamic response via frequency response functions (FRFs). Modal characteristics ─eigenfrequencies and FRF amplitudes─ are tracked across multiple fatigue states. Seven Damage Metrics (DMs) comprising three established and four newly proposed indicators are employed to quantify fatigue delamination progression, all demonstrating consistently sensitivity to modal degradation. Results reveal strong correlations between modal shifts, delamination growth, and residual strength, enabling prediction of structural integrity of the panel with increasing fatigue cycles. The proposed methodology highlights the diagnostic potential of frequency-domain dynamic responses and supports response-only, model-assisted structural health monitoring. Scalable and computationally efficient, the proposed framework provides a pathway for real-time fatigue damage monitoring in thermoplastic composite structures, with direct relevance to aerospace applications where experimental testing is constrained.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109431"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion fatigue behavior of a Mg-9Gd alloy under different glucose concentrations 不同葡萄糖浓度下Mg-9Gd合金的腐蚀疲劳行为

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-13 DOI: 10.1016/j.ijfatigue.2025.109437

Yiwen Xu , Hongyan Tang , Yi Zhang , Yan Fang , Rim Khizzou , Qiang Wang , Song Zhang , Tao Zhang , Jia Ma

{"title":"Corrosion fatigue behavior of a Mg-9Gd alloy under different glucose concentrations","authors":"Yiwen Xu , Hongyan Tang , Yi Zhang , Yan Fang , Rim Khizzou , Qiang Wang , Song Zhang , Tao Zhang , Jia Ma","doi":"10.1016/j.ijfatigue.2025.109437","DOIUrl":"10.1016/j.ijfatigue.2025.109437","url":null,"abstract":"<div><div>Under physiological conditions, Mg alloy bone implants are subjected to mechanical stress and corrosion. Consequently, developing practical clinical applications, understanding the corrosion fatigue (CF) behavior of Mg alloy is crucial. The Mg alloys is presented with a new challenge by the rising prevalence of metabolic disorders such as diabetes, as the high-glucose environment can adversely affect their behavior. This study investigates the CF behavior of the Mg-9Gd-2Nd-0.5Zr-0.5In alloy (designated as Mg-9Gd) in a simulated high-glucose environment, with particular emphasis on the influence of glucose concentrations (1 g/L and 3 g/L) on its CF lifespan. To elucidate the underlying degradation mechanisms, complementary static corrosion tests were performed. The results show that the synergistic effect of cyclic loading and corrosive media substantially accelerates CF failure, particularly at higher glucose concentrations. Fractographic analysis reveals that fatigue cracks initiate at surface pits caused by localized corrosion and propagate in a brittle manner. Additionally, the static corrosion tests reveal that the oxidation of glucose combined with Cl<sup>−</sup> destabilizes the corrosion product layer on the alloy surface, further intensifying localized corrosion. This disruption enhances pitting, which facilitates crack initiation and reduces fatigue life.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109437"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145753446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of notch-fatigue thresholds based on cyclic R-curve method 基于循环r曲线法的缺口疲劳阈值预测

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2025-12-16 DOI: 10.1016/j.ijfatigue.2025.109435

Keisuke Tanaka

{"title":"Prediction of notch-fatigue thresholds based on cyclic R-curve method","authors":"Keisuke Tanaka","doi":"10.1016/j.ijfatigue.2025.109435","DOIUrl":"10.1016/j.ijfatigue.2025.109435","url":null,"abstract":"<div><div>A new fitting function of cyclic R-curve for notch fatigue is proposed, expressing the threshold stress intensity factor (SIF) range, Δ<em>K</em><sub>th</sub>, as a function of crack extension from the initiated crack. The crack initiation is defined as the onset of Stage II propagation of nucleated cracks, and the length of nucleated cracks is determined from the threshold range of the effective SIF, Δ<em>K</em><sub>effth</sub>, the amount of crack closure of nucleated cracks, and the plain fatigue limit, Δσ<em><sub>w</sub></em><sub>0</sub>. Fitting parameters of cyclic R-curves are proved to be rather insensitive to the notch geometry or loading mode. The cyclic R-curve method is successfully applied to predict in a unified way the effects of notch geometry and loading mode on fatigue threshold properties: both the fatigue limits for crack initiation and fracture, and the length of nonpropagating cracks. An approximate method is proposed to obtain fitting parameters for R-curves using only three material properties: Δσ<em><sub>w</sub></em><sub>0</sub>, Δ<em>K</em><sub>effth</sub> and Δ<em>K</em><sub>th</sub> for long cracks. The cyclic R-curve method is also applied successfully to investigate the effects of material microstructure and notch size on fatigue thresholds.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109435"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oxidation-induced crack initiation and propagation behaviors of Ni-based single crystal superalloy in VHCF regime 镍基单晶高温合金VHCF氧化致裂纹萌生与扩展行为

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2026-05-01 Epub Date: 2026-01-01 DOI: 10.1016/j.ijfatigue.2025.109461

Yang Meng, Chungen Zhou, Kezhi huang, Leyu Li, Zihua Zhao

{"title":"Oxidation-induced crack initiation and propagation behaviors of Ni-based single crystal superalloy in VHCF regime","authors":"Yang Meng, Chungen Zhou, Kezhi huang, Leyu Li, Zihua Zhao","doi":"10.1016/j.ijfatigue.2025.109461","DOIUrl":"10.1016/j.ijfatigue.2025.109461","url":null,"abstract":"<div><div>The interaction between oxidation and fatigue under lower stress in Ni-based single crystal superalloys remains insufficiently explored. In this study, a newly designed notched plate specimen was developed for VHCF testing at 1000 °C to investigate these phenomena. Quasi-in-situ observations were employed to monitor crack initiation and crack propagation processes. The results shown that all fatigue cracks initiated at the notch root and propagated in a Mode I manner. The fracture surface consists of two distinct regions, an oxidation-dominate zone (ODZ) characterized by extensive oxide coverage, and the fatigue-dominated zone (FDZ) marked by clear fatigue striations. Over 90 % of the total fatigue life was spent in the ODZ. As cracks propagated, thermally grown stress in the oxide near the crack tip altered the local stress field, promo6ting γ′ rafting and aluminum diffusion. These effects transformed the crack-tip oxide from a multilayered structure to a continuous Al<sub>2</sub>O<sub>3</sub>-rich scale. Within the ODZ, oxidation-induced crack closure suppressed crack growth, rendering the oxidation rate the dominant factor controlling the crack propagation rate. When the effective stress intensity factor exceeded a critical threshold, oxidation penetrated to the γ/γ′ interface within the substrate, triggering a transition from ODZ to FDZ and accelerating crack growth. Overall, these findings confirm that enhancing oxidation resistance is still critical for improving VHCF performance in Ni-based single crystal superalloys.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"206 ","pages":"Article 109461"},"PeriodicalIF":6.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0