| Related citation: | Ying-Ping Guan,Zhen-Hua Wang,Bin Wu,Wei-Xin Wang,Wan-Tang Fu.Mechanism and Inhibition of Grain Coarsening of Al-Mg-Si Alloy in Hot Forming[J].Journal of Harbin Institute Of Technology(New Series),2013,20(3):67-74.DOI:10.11916/j.issn.1005-9113.2013.03.011. |
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| Author Name | Affiliation | | Ying-Ping Guan | Key Laboratory of Advanced Forging ＆ Stamping Technology and ScienceYanshan University, Ministry of Education of China, Qinhuangdao 066004, China | | Zhen-Hua Wang | Key Laboratory of Advanced Forging ＆ Stamping Technology and ScienceYanshan University, Ministry of Education of China, Qinhuangdao 066004, China | | Bin Wu | College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, Beijing 100124, China | | Wei-Xin Wang | CITIC Dicastal Wheel Manufacturing Co., Ltd., Qinhuangdao 066003, China | | Wan-Tang Fu | State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China |
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| Abstract: |
| A high-Ti 6061 alloy was rolled with strains up to 0.8-2.0 and at 350-550 ℃. Microstructures that developed during deformation and subsequent solution heat treatment (SHT) were observed by using optical and transmission electron microscopy. Microstructure evolution during SHT depends mainly on the initial rolling temperature, and it was found that the higher this temperature is, the coarser the grains are. After rolling at 400 ℃, well-defined cells and subgrains were formed, which induced further sites for recrystallization nucleation during subsequent SHT. The recrystallization mechanism was found to be subgrain rotation, with a final grain size smaller than 200 μm. Increasing the rolling temperature to 500 ℃ results in a low density of dislocations distributed uniformly in the deformed matrix and fewer nucleation sites during subsequent SHT. The recrystallization mechanism is grain boundary bulging, while the final grain size approaches several millimeters. Finally, a hot forming process of high-Ti 6061 alloy for inhibiting grain coarsening was proposed, and verified by experiments. |
| Key words: aluminum alloy grain size recrystallization nucleation mechanism |
| DOI：10.11916/j.issn.1005-9113.2013.03.011 |
| Clc Number:TG111.7 |
| Fund: |
