摘要
对 7475- T761铝合金材料在 3.5% Na Cl水溶液中的变形与腐蚀电流关系进行了试验测试 ,结合裂尖局部应力应变的分析结果 ,对等幅循环载荷作用下 ,7475- T761铝合金 - 3.5% Na
Our research on corrosive fatigue crack growth has been supported by NNSFC (National Natural Science Foundation of China) for over a decade. We carried out experimental research for about one year on the relation between strain and corrosion current of 7475-T761 aluminum alloy in 3.5% NaCl solution (It was part of a bigger project lasting more than four years). In section 3, concentrating on crack tip zone, we calculated and analyzed the corrosive damage of anode dissolution on fatigue crack propagation under constant amplitude loading. Our analysis shows that: (1) The effect of anode dissolution on corrosive fatigue crack growth rate is relatively small as compared with the total value of the rate. (2) Contrary to general belief, anode dissolution in the 7475-T761 aluminum alloy-3.5% NaCl solution system is not the mechanism of the corrosive fatigue crack propagation under low cycle loading; the hydrogen ion produced from cathode causes the degeneration of plasticity at the crack tip zone.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2001年第2期225-228,共4页
Journal of Northwestern Polytechnical University
基金
国家 973项目资助 !(G19990 6 5 0 0 8)
关键词
铝合金
腐蚀电流
阳极溶解
疲劳裂纹扩展
裂尖
T761 aluminum, corrosion current, anode dissolution, fatigue crack growth
