| METALS AND METAL MATRIX COMPOSITES |
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| Intergranular Corrosion Behavior of the Friction-stir-welded Joint of 7N01S-T5 Aluminum Alloy Plate |
| FANG Zhenbang1,2, ZHANG Zhiqiang1,2, LI Ying1,2, YIN Hua3, XING Yanshuang4, HE Changshu1,2
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1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819
2 Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819
3 Research & Development Center, CRRC Changchun Railway Vehicles Co.Ltd., Changchun 130062
4 CRRC Qingdao Sifang Locomotive Vehicle Co.Ltd.,Qingdao 266111 |
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Abstract In this work, the intergranular corrosion tests were conducted for the vertically-sliced samples of a friction-stir-welded (FSW),14 mm-thick 7N01s-T5 aluminum alloy plate, and OM, TEM were employed to determine the intergranular corrosion behavior of different areas of the joint. The results showed that the different locations in welded joint have various corrosion morphology after intergranular corrosion test. The heat-affec-ted zone (HAZ) of the weld exhibits the highest susceptibility to intergranular corrosion, in which the top and the bottom surface layers suffer more serious corrosion than the central layer. This can be ascribed to the continuously dispersed precipitates on grain boundary and the grain size. The thermo-mechanically affected zone (TMAZ) is a transition zone locating between the heat-affected zone and the stir zone, and characterized by a highly deformed structure. However, TMAZ is relatively less susceptible to intergranular corrosion, owing to the thermal cycle it experienced and the partial re-dissolving of the precipitates on the grain boundary. The stir zone (SZ) experiences severe plastic deformation and temperature cycling during FSW process, which results in a fine grain equiaxed structure, and in consequence, complete re-dissolving of the precipitates. Hence SZ can be considered most insensitive to intergranular corrosion.
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Published: 31 January 2019
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| Fund:This work was financially supported by the National Key Research and Development Program of China (2016YFB1200506-12,2016YFB0300801). |
| About author:: Zhenbang Fang received his M.S. degree in January 2017 from Northeastern University, focusing on corrosion of welding of aluminum alloy materialChangshu He received his Ph. D. degree in enginee-ring from Northeastern University in 2003. He is currently an associate professor in Key Laboratory for Anisotropy and Texture of Materials, Northeastern University. He is mainly engaged in the research and development of advanced welding technology and welding materials for aluminum alloys. He has published more than 40 articles and obtained 5 invention patents. |
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2019, Vol. 33 
