Influence of corrosion deposits on near-threshold fatigue crack growth behavior in 2xxx and 7xxx series aluminum alloys
Influence of corrosion deposits on near-threshold fatigue crack growth behavior in 2xxx and 7xxx series aluminum alloys
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腐蚀沉积物对 2xxx 和 7xxx 系列铝合金近阈值疲劳裂纹扩展行为的影响
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
S. Suresh
中科院分区：
文献类型：
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作者：
A. Vasudévan;S. Suresh
详细研究了腐蚀沉积物对 2XXX 和 7XXX 系列铝合金近阈值疲劳裂纹扩展行为的影响。借助 X 射线光电子能谱、扫描俄歇能谱和二次离子质谱分析来表征断裂表面氧化膜的成分、厚度和分布。研究发现，铝合金中腐蚀碎片引起的裂纹闭合程度很大程度上取决于成分和时效处理。结果表明，一些铝合金中受环境影响的近阈值裂纹扩展受到两个并行且相互竞争的机械过程的控制：腐蚀沉积物导致的裂纹闭合（倾向于完全阻止近阈值裂纹）和与潮湿介质中裂纹尖端氧化现象相伴的强脆化效应（显着增加近阈值裂纹扩展速率）。将铝合金的近阈值腐蚀疲劳特性与各种钢的近阈值腐蚀疲劳特性进行对比，以便深入了解各种钢材的近阈值腐蚀疲劳特性。
The role of corrosion deposits in influencing the near-threshold fatigue crack propagation behavior of 2XXX and 7XXX series aluminum alloys is examined in detail. The composition, thickness, and distribution of fracture surface oxide films are characterized with the aid of X-ray photoelectron spectroscopy, scanning Auger spectroscopy, and secondary ion mass spectroscopy analyses. It is found that the extent of crack closure due to corrosion debris in aluminum alloys is strongly dependent on the composition and aging treatment. The results suggest that environmentally-influenced near-threshold crack propagation in some aluminum alloys is controlled by twoconcurrent andmutually-compctitive mechanistic processes: a dominant role of crack closure due to corrosion deposits (which tends toarrest completely the near-threshold crack) and a strong embrittling effect (which considerablyincreases near-threshold crack growth rates) concomitantly with the crack tip oxidation phenomenon in the moist medium. The near-threshold corrosion fatigue characteristics of aluminum alloys are contrasted with those in a wide range of steels in order to gain an insight into the various