{11-21}孪晶在锆疲劳裂纹萌生中的关键作用

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-08-10 DOI:10.1016/j.ijfatigue.2025.109232

Qing Jiang , Yao Chen , Fulin Liu , Lang Li , Chao He , Hong Zhang , Chong Wang , Yongjie Liu , Qiang Chen , Qingyuan Wang

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引用次数: 0

摘要

在核反应堆中广泛应用的锆金属材料易受流动振动的影响，面临着疲劳断裂的严峻挑战。本文系统地研究了循环载荷作用下锆材料的裂纹萌生机制。研究发现，虽然棱柱滑移是主要的变形模式，但裂纹萌生主要受{11-21}变形孪晶控制。由于循环加载过程中的孪晶极性，{11-21}孪晶的激活发生在两个临界峰角附近：27°或62°（母粒c轴与加载轴之间的夹角）。随后，母晶和孪晶区棱柱滑移的施密德因子显著不同。结果表明，激活的棱柱滑移难以跨越孪晶边界，导致孪晶界面局部应变积累和裂纹成核。这些发现强调了疲劳过程中锆的双边界主导裂纹起裂机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Critical role of {11–21} twinning in fatigue crack initiation in zirconium

Zirconium metals, widely employed in nuclear reactor applications, are susceptible to flow-induced vibrations, facing a critical challenge to fatigue fracture. This study systematically investigates crack initiation mechanism in Zirconium under cyclic loading. It is found that although prismatic slip dominates as the primary deformation mode, crack initiation is predominantly governed by {11–21} deformation twinning. Due to the twinning polarity during cyclic loading, the activation of {11–21} twinning occurs near two critical peak angles: 27° or 62° (the angle between the c-axis of the parent grains and the loading axis). Subsequently, a significant difference in Schmid factors for prismatic slip develops between the parent grain and the twinned region. As a result, the activated prismatic slips can hardly move across the twinning boundaries, leading to localized strain accumulation and crack nucleation at twin interfaces. These findings highlight a twin-boundary-dominated crack initiation mechanism in Zirconium during fatigue.

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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.