Mechanism and Inhibition of Grain Coarsening of Al-Mg-Si Alloy in Hot Forming
Ying-Ping Guan1,3, Zhen-Hua Wang1, Bin Wu2, Wei-Xin Wang3, Wan-Tang Fu4
(1.Key Laboratory of Advanced Forging ＆ Stamping Technology and Science(Yanshan University), Ministry of Education of China, Qinhuangdao 066004, China;2. College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, Beijing 100124, China; 3. CITIC Dicastal Wheel Manufacturing Co., Ltd., Qinhuangdao 066003, China; 4. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China)
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:
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Mechanism and Inhibition of Grain Coarsening of Al-Mg-Si Alloy in Hot Forming
本站小编 哈尔滨工业大学/2019-10-24
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