Materials Reports  2021, Vol. 35 Issue (Z1): 411-413 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Single-stage Aging Treatment on Tensile Properties of 7075 Aluminum Alloy Coated Sheet |
| YU Fang1,2, CHAO Daiyi1,3, XING Lei1, WANG Xin1, HUANG Tongjian1, WANG Xiangjie2
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1 National Engineering Research Center for Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co., Ltd., Longkou 265713, China
2 College of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3 Shandong Nanshan Institute of Science and Technology Co., Ltd., Longkou 265713, China |
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Abstract In order to meet the performance requirements of 7075 aluminum alloy coated sheet T6 aging for large aircraft skin. In this paper, the homo-genization effect and the effect of single stage aging process on the mechanical properties of 7075 thin plate were studied by means of room temperature tensile test, OM and SEM. The results showed that Fe - containing phase remained and eutectic structure was basically eliminated after homogenization. After hot rolling, cold rolling to 2.5 mm and then solution treatment, the grains of the plate were elongated and the recrystallization degree reached 80%. The single-stage aging results show, that with the increase of aging time, the tensile strength and yield strength in the L and LT directions of 7075 thin plate increase continuously, while the elongation decreases. At 121 ℃/36 h, the T6 state aging system of 7075 thin plate is selected. At this time, the tensile strength in the L and LT directions are 531 MPa and 520.5 MPa, respectively; the yield strength is 448.5 MPa and 440.5 MPa, and the elongation is 15.5% and 14.8%, respectively.
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Published: 16 July 2021
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| Fund:National Demonstration Platform for Production and Application of New Materials,the Natural Science Foundation of China(U1708251),the Key R&D Plan of Liaoning Province(2020JH2/10700003),the Xing Liao Plan(XLYC1807027). |
| About author:: Fang Yu received her master degree of material forming and control engineering from North Eastern University. Now is a doctor candidate of North Eastern University and is a engineer, Mainly major in microstructure and property research of aviation aluminum.Daiyi Chao received his master of engineering in environmental and material engineering from Yantai University in June 2013. From September 2013 to March 2017, he studied for doctorate in school of materials, Harbin Institute of Technology. Currently, working at Shandong Nanshan Science and Technology Research Institute and has published more than 20 journal papers. Mainly engaged in heat treatment and deformation process of high strength aluminum alloy. At present, he is a failure analysis expert of Chines Failure Analysis Institution of CMES. |
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