METALS AND METAL MATRIX COMPOSITES |
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Effect of Grain Structure on Corrosion Resistance of 7150 Al Alloy |
HE Chunhua, LI Hongping, YE Lingying, LIU Shengdan, Tang Jianguo
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School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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Abstract The effect of different grain structures on corrosion performance of 7150 alloy was studied by four-point bending test, exfoliation corrosion immersion, optical microscope (OM), electron back scattered diffraction (EBSD), and scanning transmission electron microscope (STEM). The results show that the coarse grain on surface has higher stress corrosion sensitivity. The fracture time of samples with coarse grain and fiber grain are about 16 h and 124 h, respectively. The anti-exfoliation corrosion of coarse grain is superior to the fiber grain. The exfoliation corrosion grade of coarse grain is P, while the exfoliation corrosion grades of fiber grain are EC/D. Coarse grain boundaries are high-angle grain boundaries with higher surface energy, and have wider precipitate-free zone (PFZ), which decreases the boundary strength. So, the stress corrosion cracks are easy to propagate along the high-angle grain boundaries. Poor exfoliation corrosion of fiber grain is related to the low content of Cu in grain boundary precipitates (GBPs) leading to the dissolution of precipitates. And the continuous distribution of grain boundary precipitates in fiber grain accelerates the dissolution process. Therefore, fiber grain has higher sensitivity of exfoliation corrosion.
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Published: 25 November 2021
Online: 2021-12-13
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Fund:National Key Research and Development Program (2016YFB0300901). |
About author: Chunhua Heis a master candidate in the School of Materials Science and Engineering, Central South University. The research mainly focuses on the perfor-mance detection and process development of high-performance aluminum alloy. She has participated in one National Natural Science Foundation Project and two school-enterprise cooperation projects. Lingying Yeis an associate professor and doctoral supervisor of Central South University, a member of the academic committee of superplasticity forum of plastic engineering branch of China Society of Mechanical Engineering, and a member of the academic committee of Henan Key Laboratory of fastening connection technology. He mainly engaged in the research of control of microstructures and properties, grain refinement, high-temperature deformation behavior and corresponding mechanism of high-performance aluminum alloy. He has presided more than one National Natural Science Foundation Youth Fund Project, two sub projects of the National Key Research and Development Program of China, three projects of National 863 Plan, and more than 10 school enterprise cooperation projects. He has published more than 60 papers in various academic journals, won more than 10 national invention patents, and won the third prize of science and technology award of Aviation Industry Corporation of China. |
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