Evolution in microstructure and tensile properties of a novel Al-Mg-Si-Cu alloy under peak-aged condition during fatigue process

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-25 DOI:10.1016/j.matchar.2025.115086

Ni Tian , Peihong Zhang , Tianxiang Zhang , Yinzhu Li , Yaozhong Zhang , Yiran Zhou , Quanxin Yan , Gang Zhao , Gaowu Qin

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引用次数: 0

Abstract

With the development of high-speed trains towards higher speeds (400 km/h and above) and longer service life, the fatigue performance of its body materials has become a critical factor limiting their safety performance. Therefore, the second-phase particles, grains, dislocations, strength, and elongation of peak-aged Al-0.81Mg-0.84Si-0.53Cu alloy sheets for the body of next-generation high-speed trains were investigated after fatigue loading at 28 MPa/280 MPa for 5 × 10³, 1 × 10⁴, 5 × 10⁴, 1 × 10⁵, and 1.3 × 10⁵ cycles. There were no obvious changes in the second-phase particles and grains of the alloy sheet; however, the dislocation density increased monotonically, and the distribution of dislocations varied with an increase in the number of fatigue cycles. The relationship between the mechanical properties of the alloy sheet and fatigue cycles was characterized by four stages: fatigue hardening stage (<5 × 10³ cycles), fatigue turbulent stage (5 × 10³ cycles to 1 × 10⁴ cycles), fatigue stable stage (1 × 10⁴ cycles to 1 × 10⁵ cycles), and fatigue and buckling stage (1 × 10⁵ to 1.3 × 10⁵ cycles). The results can provide basic data and a theoretical basis for objectively predicting the safe service life of Al-0.81Mg-0.84Si-0.53Cu alloy for high-speed trains.

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一种新型Al-Mg-Si-Cu合金在疲劳过程中峰时效状态下的组织和拉伸性能演变

随着高速列车向更高速度（400km /h及以上）和更长的使用寿命发展，其车体材料的疲劳性能已成为限制其安全性能的关键因素。为此，研究了新一代高速列车车体用Al-0.81Mg-0.84Si-0.53Cu合金薄板在28 MPa/280 MPa、5 × 103、1 × 104、5 × 104、1 × 105和1.3 × 105次循环疲劳载荷下的第二相颗粒、晶粒、位错、强度和伸长率。合金板材的第二相颗粒和晶粒无明显变化；但位错密度单调增加，且位错分布随疲劳循环次数的增加而变化。合金板的力学性能与疲劳循环的关系表现为4个阶段：疲劳硬化阶段（5 × 103次）、疲劳湍流阶段（5 × 103 ~ 1 × 104次）、疲劳稳定阶段（1 × 104 ~ 1 × 105次）和疲劳屈曲阶段（1 × 105 ~ 1.3 × 105次）。研究结果可为客观预测高速列车用Al-0.81Mg-0.84Si-0.53Cu合金的安全使用寿命提供基础数据和理论依据。

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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.