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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Stress Corrosion Cracking Behavior of 4.19Zn-1.34Mg (A7N01S-T5) Aluminum Alloy Welded Joints
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Stress Corrosion Cracking Behavior of 4.19Zn-1.34Mg (A7N01S-T5) Aluminum Alloy Welded Joints

机译：Stress Corrosion Cracking Behavior of 4.19Zn-1.34Mg (A7N01S-T5) Aluminum Alloy Welded Joints

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摘要

The fracture toughness behavior of Al-Zn-Mg alloy, A7N01S-T5, welded joints was investigated using three points bending test with the J integral approach. The microstructures of the welded joints were examined using optical microscopy, microhardness, and transmission electron microscopy. The heat affected zone (HAZ) had the best crack propagation resistance, and the weld zone (WZ) and base metal (BM) behaved similarly. The stress corrosion cracking (SCC) behavior of the welded joints was investigated under a constant loading condition. The threshold stress intensity factor of SCC and the cracks' propagation rate were tested. The microstructure of the fracture was examined using optical microscope and scanning electron microscope. The results showed that both the BM and the HAZ were susceptible to SCC and the HAZ was smaller than the BM, but no cracks were detected in the WZ. A greater amount of H+ and a higher concentration of Zn and Mg accumulated at the crack front tips, which led to the SCC resistance weakening in the A7N01S-T5 welded joints.

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