| Corrosion-enhanced dislocation emission and motion resulting in initiation of stress corrosion cracking |
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| 作者姓名： | 褚武扬 谷飚 高克玮 黄一中 肖纪美 |
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| 作者单位： | Department of Materials Physics，University of Science and Technology Beijing，Beijing 100083，China，Department of Materials Physics，University of Science and Technology Beijing，Beijing 100083，China，Department of Materials Physics，University of Science and Technology Beijing，Beijing 100083，China，Department of Materials Physics，University of Science and Technology Beijing，Beijing 100083，China，Department of Materials Physics，University of Science and Technology Beijing，Beijing 100083，China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China. |
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| 摘 要： | A special constant deflection device for TEM has been designed, and then change of dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of brass in water and of Ti-24Al-11Nb alloy in methanol and initiation of SCC can he observed in TEM In situ tensile test in TEM for brass was carried out for comparison The results show that anodic dissolution during SCC can facilitate dislocation emission, multiplication and motion, and a dislocation free zone (DFZ) is formed The stress at a particular site in the DFZ, which is an elastic zone and is thinned gradually through corrosion-enhanced dislocation emission and motion, is possibly up to the cohesive strength, resulting in initiating of a nanocrack of SCC in the DFZ or sometimes at the crack tip. Because of the action of the corrosion solution the nanocrack of SCC propagates into a cleavage or intergranular microcrack rather than blunts into a void like in situ tension in TEM
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Corrosion-enhanced dislocation emission and motion resulting in initiation of stress corrosion cracking |
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| Wuyang Chu,Biao Gu,Kewei Gao,Yizhong Huang,Jimei Xiao.Corrosion-enhanced dislocation emission and motion resulting in initiation of stress corrosion cracking[J].Science in China(Technological Sciences),1997,40(3):235-242. |
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| Authors: | Wuyang Chu Biao Gu Kewei Gao Yizhong Huang Jimei Xiao |
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| Affiliation: | (1) Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, China |
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| Abstract: | A special constant deflection device for TEM has been designed, and then change of dislocation configuration ahead of a crack tip during stress corrosion cracking (SCC) of brass in water and of Ti-24Al-11Nb alloy in methanol and initiation of SCC can he observed in TEM In situ tensile test in TEM for brass was carried out for comparison The results show that anodic dissolution during SCC can facilitate dislocation emission, multiplication and motion, and a dislocation free zone (DFZ) is formed The stress at a particular site in the DFZ, which is an elastic zone and is thinned gradually through corrosion-enhanced dislocation emission and motion, is possibly up to the cohesive strength, resulting in initiating of a nanocrack of SCC in the DFZ or sometimes at the crack tip. Because of the action of the corrosion solution the nanocrack of SCC propagates into a cleavage or intergranular microcrack rather than blunts into a void like in situ tension in TEM |
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| Keywords: | stress corrosion cracking corrosion-enhanced dislocation emission and motion brass Ti-24Al-11Nb |
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