文档介绍：Materials Science and Engineering A 423 (2006) 247–252
Microstructure evolution of AZ31 Mg alloy during equal
channel angular extrusion
Li Jin a,b, Dongliang Lin a,b,∗, Dali Mao a,b, Xiaoqing Zeng a,c,
Bin Chen a,c, Wenjiang Ding a,c
a School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, PR China
b Open Laboratory of the Educational Ministry for High Temperature Materials and Tests, Shanghai Jiao Tong University, Shanghai 200030, PR China
c National Engineering Research Center of Light Forming, Shanghai Jiao Tong University, Shanghai 200030, PR China
Received 9 January 2006; accepted 1 February 2006
Abstract
Microstructure evolution of AZ31 Mg alloy during equal-channel angular extrusion (ECAE) was investigated. The grains of AZ31 Mg alloy
were refined significantly after extruded one to eight passes at 498 K. Dislocations were induced at the initial stage of extrusion and they rearranged
themselves to form dislocation boundaries and sub-grain boundaries during deformation. As strain increased, the newly created dislocations in sub-
grains were absorbed by the sub-boundaries and the misorientation between sub-boundaries increased and evolved to low angle grain boundaries
(LAGBs) and high angle grain boundaries (HAGBs). The process of grain refinement can be described as continuous dynamic recovery and
recrystallizati