Microstructure and mechanical properties of 7075 aluminum alloy during complex thixoextrusion |
| |
| Affiliation: | 1. National Key Laboratory for Precision Hot Processing of Metal, Harbin Institute of Technology, Harbin 150001, China;2. KaShui Technology (Huizhou) Co., Ltd., Huizhou 516000, China;1. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Grinm Group Co., Ltd., Beijing 100088, China;1. College of Energy Engineering, Yulin University, Yulin 719000, China;2. Yulin Key Laboratory of Metal Matrix Composites and Remanufacturing Technology, Yulin University, Yulin 719000, China;1. School of Materials, Beijing Institute of Technology, Beijing 100081, China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China;1. Programa de Pós-graduação em Ciência e Engenharia de Materiais (PPG-CEM), Universidade Federal de São Carlos (UFSCar), Rod. Washington Luiz, Km 235, 13565-905 São Carlos - SP, Brazil;2. Divisão de Materiais, Instituto de Aeronáutica e Espaço, CTA, Praça Marechal Eduardo Gomes, 50, 12228-904 São José dos Campos - SP, Brazil;3. Departamento de Engenharia de Materiais (DEMa), Universidade Federal de São Carlos (USFCar), Rod. Washington Luiz, Km 235, 13565-905 São Carlos - SP, Brazil |
| |
| Abstract: | 7075 aluminum alloy was used to obtain elbow parts by complex thixoextrusion and the microstructure evolution and mechanical properties during this process were studied by SEM, TEM and other analytical methods. The results show that different parts in 7075 aluminum alloy show quite different microstructures. The microstructure of the thin walls formed by back-extrusion is stratified, and the bottom of the parts formed by angular extrusion is obviously deformed. Shear forces contribute to the crushing of grains and the coarse second phase. The main strengthening phases in the material are η phase and E phase, whose amounts greatly decrease during heating to semi-solid and thixoextrusion. After heat treatment, they can precipitate evenly to improve the mechanical properties of the material. The average tensile strength of whole part after thixoextrusion and heat treatment is 485.49 MPa, while the average elongation is 5.49%. |
| |
| Keywords: | 7075 aluminum alloy thixoextrusion semi-solid forming elbow parts mechanical properties |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
