Elucidating the mechanisms of gradient nanostructure on enhancing fatigue resistance of pure zirconium

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-04-01 Epub Date: 2025-02-12 DOI:10.1016/j.matchar.2025.114844

Yuliang Zhou , Conghui Zhang , Xiangkang Zeng , Wenguang Zhu , Kangkai Song

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Abstract

In this paper, the strengthening mechanism and anti-fatigue mechanism of gradient nanostructure were discussed in detail, and a crack propagation rate model was established based on the characterization of gradient nanostructure and residual compressive stress. Results indicated that the gradient nanostructure exhibited several characteristics, including grain size, grain orientation, twin thickness/density, dislocation density gradient, and residual stress gradient. The strengthening effect mainly originates from nanograins/ultra-fined grains and twins. Compared with coarse-grained Zr (CG-Zr), the fatigue limit of gradient nanostructured Zr (GNS-Zr) was increased by about 25 %. The synergistic effect of gradient nanostructure and residual compressive stress enhances the resistance of crack initiation, effectively reducing the driving force and increasing the resistance of crack propagation, finally significantly improving the fatigue lifetime of GNS-Zr. A crack propagation rate model with gradient nanostructured characteristics was obtained.

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探讨梯度纳米结构增强纯锆抗疲劳性能的机理

本文详细讨论了梯度纳米结构的强化机理和抗疲劳机理，建立了基于梯度纳米结构表征和残余压应力的裂纹扩展速率模型。结果表明，梯度纳米结构具有晶粒尺寸、晶粒取向、孪晶厚度/密度、位错密度梯度和残余应力梯度等特征。强化作用主要来源于纳米/超细晶粒和孪晶。与粗晶Zr （CG-Zr）相比，梯度纳米结构Zr （GNS-Zr）的疲劳极限提高了约25%。梯度纳米结构与残余压应力的协同作用增强了GNS-Zr的裂纹起裂阻力，有效降低了裂纹的驱动力，增加了裂纹扩展阻力，最终显著提高了GNS-Zr的疲劳寿命。得到了具有梯度纳米结构特征的裂纹扩展速率模型。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.