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Corrosion-enhanced dislocation emission and motion resulting in initiation of stress corrosion cracking

Science China(Technological Sciences) 1997年第3期40卷 235-242页

作者：褚武扬谷飚高克玮黄一中肖纪美 Department of Materials Physics University of Science and Technology Beijing Beijing 100083 China

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

关键词： stress corrosion cracking corrosion-enhanced dislocation emission and motion brass ti-24al-11nb.

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The in-situ TEM observation of nanocrack in titanium aluminide

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Science China Mathematics 1995年第2期38卷 233-242页

作者：褚武杨张跃王燕斌肖纪美 Department of Materials Physics University of Science and Technology Beijing 100083 China

The results of tensile test in TEM for a brittle material, ti-24al-11nb.alloy, show that a lot of dislocations can also be emitted from a brittle crack tip and a dislocation-free zone (DFZ) is formed. The DFZ is an elastic zone with large strain and the stress in the DFZ may reach the cohesive strength of the material provided that the crack tip is sharp enough and the applied stress is large enough, resulting in initiating of a nanocrack in the DFZ or sometimes at the crack tip. The nanocrack formed in the DFZ is stable and will propagate into a deavage microcrack through multiplication and movement of dislocations in the plastic zone. Increasing the applied stress, the crack can stably propagate continuously or discontinuously.

关键词： nanocrack dislocation-free zone ti-24al-11nb.

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