Microstructure evolution and thixoforming behavior of 7075 aluminum alloy in the semi-solid state prepared by RAP method |
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| Authors: | Jin-long Fu Kai-kun Wang Xiao-wei Li Hai-kuan Zhang |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Tianjin Zhonglian Precision Casting Co., Ltd., Tianjin 301800, China |
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| Abstract: | The effects of isothermal treatments on the microstructural evolution and coarsening rate of semi-solid 7075 aluminum alloy pro-duced via the recrystallization and partial remelting (RAP) process were investigated. Samples of 7075 aluminum alloy were subjected to cold extrusion, and semi-solid treatment was carried out for 5–30 min at temperatures ranging from 580 to 605°C. A backward-extrusion ex-periment was conducted to investigate liquid segregation during the thixoforming process. The results revealed that obvious grain coarsening and spheroidization occurred during prolonged isothermal treatments. In addition, higher soaking temperatures promoted the spheroidization and coarsening process because of the increased liquid fraction and the melting of second phases. Segregation of the liquid phase caused by the difference in fluidity between the liquid and the solid phases was observed in different regions of the thixoformed specimens. |
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| Keywords: | aluminum alloys microstructural evolution thixoforming grain coarsening segregation |
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