中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 5 May 2012 |
submicrometer grain size
（1. School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:Submicrometer-grained (SMG) Al−3%Mn (mass fraction) alloy specimens with initial grain size of ~0.3 μm were produced by ball milling for 3 h. The Al−3%Mn specimens which were cold rolled with a strain rate of 1×10−3− 1×10−2 s−1 at room temperature show high extensibility to failure more than 2500%. Microstructures of pure Al and Al−3%Mn alloy at as-milled and cold-rolled state were examined using X-ray diffraction and transmission electron microscopy (TEM). Based on the microstructure analysis, it is established that the mechanism of the continued plastic deformation in SMG Al−3%Mn alloy consists of dislocation slip, grain boundary sliding companied by dynamic recovery and recrystallization, and dynamic recrystallization is a main control factor of the large plastic deformation.
Key words: aluminium alloys; mechanical alloying; cold rolling; deformation structure
