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首页> 外文期刊>Materialwissenschaft und Werkstofftechnik >Effects of plate thickness on fatigue fracture behaviors of an aluminum alloy (Al-Cu-Mg)
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Effects of plate thickness on fatigue fracture behaviors of an aluminum alloy (Al-Cu-Mg)

机译：板厚对铝合金（Al-Cu-Mg）疲劳断裂行为的影响

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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.
机译：通过确定厚度分别为30mm，40mm和55mm的2124-T851铝合金板的疲劳S-N曲线，疲劳裂纹扩展率和断裂韧性，研究了不同厚度的2124铝合金板的高周疲劳性能。本文还利用扫描电子显微镜的形貌观察，能谱分析，X射线衍射相分析和透射电子显微镜观察对合金板的疲劳断裂行为进行了分析和讨论。结果表明，板厚影响2124铝合金板的综合疲劳性能。薄板可实现更好的综合疲劳性能。由于热轧过程中变形量的不同，不同厚度合金板的显微组织变化主要集中在晶粒尺寸，亚结构和晶界体积分数的差异上。板越薄，晶粒尺寸越小，因此，板越薄，晶粒边界和子结构的体积分数越高，并且对疲劳裂纹扩展的抵抗力越大，因此，板越薄，其疲劳性能越好。

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