Fatigue crack propagation behavior of 2195 Al-Li alloy plate at low temperature

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2025-07-01 Epub Date: 2025-02-20 DOI:10.1016/j.ijfatigue.2025.108890

Yingzhi Li, Cunsheng Zhang, Zinan Cheng, Zijie Meng, Liang Chen, Guoqun Zhao

{"title":"Fatigue crack propagation behavior of 2195 Al-Li alloy plate at low temperature","authors":"Yingzhi Li, Cunsheng Zhang, Zinan Cheng, Zijie Meng, Liang Chen, Guoqun Zhao","doi":"10.1016/j.ijfatigue.2025.108890","DOIUrl":null,"url":null,"abstract":"<div><div>Great attention has been attached to Al-Li alloys due to their excellent performance for aerospace structural components, which endure low-temperature environments and cyclic loads, posing intense demands on the fatigue resistance of materials. In this work, the fatigue crack propagation (FCP) behaviors at low temperatures (−80 °C) of as-rolled 2195 Al-Li alloy have been investigated and compared with those at room temperature. It was found that the influence of grain boundaries and secondary phase particles on FCP is direction-dependent: both of them accelerate FCP in the parallel rolling direction (TL) and impede FCP in the perpendicular rolling direction (LT). Meanwhile, the grains with high Schmid factors have an attractive effect on the FCP path, but this effect diminishes at low temperature. The weakened dislocation movement at low temperature impedes cracks from entering the grains and propagating along the slip planes, resulting in crack deflection and propagation along grain boundaries. This mechanism retards the rate of FCP and significantly enhances the fatigue resistance of Al-Li alloys at low temperature.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"196 ","pages":"Article 108890"},"PeriodicalIF":6.8000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Fatigue","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0142112325000878","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/2/20 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Great attention has been attached to Al-Li alloys due to their excellent performance for aerospace structural components, which endure low-temperature environments and cyclic loads, posing intense demands on the fatigue resistance of materials. In this work, the fatigue crack propagation (FCP) behaviors at low temperatures (−80 °C) of as-rolled 2195 Al-Li alloy have been investigated and compared with those at room temperature. It was found that the influence of grain boundaries and secondary phase particles on FCP is direction-dependent: both of them accelerate FCP in the parallel rolling direction (TL) and impede FCP in the perpendicular rolling direction (LT). Meanwhile, the grains with high Schmid factors have an attractive effect on the FCP path, but this effect diminishes at low temperature. The weakened dislocation movement at low temperature impedes cracks from entering the grains and propagating along the slip planes, resulting in crack deflection and propagation along grain boundaries. This mechanism retards the rate of FCP and significantly enhances the fatigue resistance of Al-Li alloys at low temperature.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

2195铝锂合金板低温疲劳裂纹扩展行为

铝锂合金因其在航天结构件上的优异性能而备受关注，因为它需要承受低温环境和循环载荷，对材料的抗疲劳性能提出了很高的要求。本文研究了2195 Al-Li合金轧制后在低温（- 80℃）下的疲劳裂纹扩展行为，并与常温下的疲劳裂纹扩展行为进行了比较。结果表明，晶界和二次相颗粒对FCP的影响具有方向性：它们在平行轧制方向上加速FCP，在垂直轧制方向上阻碍FCP。同时，高施密德因子的晶粒对FCP路径有吸引效应，但在低温下这种效应减弱。低温下位错运动减弱，阻碍了裂纹进入晶粒并沿滑移面扩展，导致裂纹偏转并沿晶界扩展。这一机制延缓了FCP速率，显著提高了铝锂合金的低温抗疲劳性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

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.