中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 2 February 2026 |
（a School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
b National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China;
c Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China;
d Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063099, China;
e Jiangsu Haoran Spray Forming Alloy Co., Ltd., Zhenjiang 212009, China;
f School of Engineering and Applied Sciences, Nile University, Giza 12677, Egypt;
g Smart Engineering Systems Research Centre (SESC), Nile University, Giza 12677, Egypt）
Abstract:Cryogenic rolling impacts on microstructure and mechanical properties of spray-formed 7055 (SF-7055) Al alloy were investigated. Results show that with the increase of the reduction from 20% to 80%, the grain of cryogenic rolled SF-7055 Al alloy is elongated to form a fiber texture. Numerous proliferating dislocations in the microstructure accumulate into dislocation walls and cells, and eventually form subgrains. These subgrain boundaries divide the original grain, thereby reducing the grain size. Under severe deformation conditions, they even enable the formation of nanograins. Meanwhile, the Cu-rich precipitates in the matrix are also broken and refined under the action of large rolling stress. In the process of cryogenic rolling, the tensile strength and hardness of SF-7055 Al alloy gradually increase, while the plasticity decreases. Moreover, the fracture morphology of cryogenic rolled SF-7055 Al alloy gradually transforms to the ductile and quasi-cleavage hybrid fracture characteristics with increased reduction.
Key words: spray-formed Al alloy; cryogenic rolling; microstructure; mechanical properties; nanograins
