Effects of plate thickness on fatigue fracture behaviors of an aluminum alloy (Al-Cu-Mg)

被引：3
作者：
Jian, H. [1 ,2 ]
Luo, J. [1 ]
Tang, X. [1 ]
Li, X. [1 ]
机构：
[1] Hunan Univ Technol, Taishan West Rd 88, Tianyuan Dist 412007, Zhuzhou, Peoples R China
[2] Queensland Univ Technol, GPO Box 2434, Brisbane, Qld 4001, Australia
来源：
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK | 2018年 / 49卷 / 09期
基金：
中国国家自然科学基金;
关键词：
2124 aluminum alloy; fatigue fracture; fatigue properties; plate thickness; size effect; MICROSTRUCTURE; GROWTH;
D O I：
10.1002/mawe.201700115
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High cycle fatigue properties of 2124 aluminum alloy plates with different thickness were investigated by determining fatigue S-N curves, fatigue crack growth rates and fracture toughness of 2124-T851 aluminum alloy plates with the thickness of 30mm, 40mm and 55mm, respectively. Fatigue fracture behaviors of alloy plates were also analyzed and discussed using scanning electron microscope morphology observation, energy spectrum analysis, X-ray diffraction phase analysis and transmission electron microscopy observation in this paper. The results indicate that plate thickness affects the comprehensive fatigue properties of 2124 aluminum alloy plates. Thinner plate achieves better comprehensive fatigue properties. Due to the different amount of deformation during hot rolling, the variation of microstructure of alloy plates with different thickness mainly concentrates on the difference of grain sizes, substructure and volume fraction of grain boundaries. The thinner the plate, the smaller the grain sizes and therefore the thinner plate produces a higher volume fraction of grain boundaries and substructure, and a greater resistance to fatigue crack growth, thus thinner plate exhibits better fatigue properties.
引用
收藏
页码：1087 / 1097
页数：11
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