Mechanisms of dynamic recrystallization in aluminum alloys

被引:42
作者
Kaibyshev, Rustam [1 ]
Malopheyev, Sergey [1 ]
机构
[1] Belgorod State Univ, Lab Mech Properties Nanostruct Mat & Superalloys, Belgorod 308015, Russia
来源
ALUMINIUM ALLOYS 2014 - ICAA14 | 2014年 / 794-796卷
关键词
aluminum alloys; thermomechanical processing; ultrafine grained structure; severe plastic deformation; MG-SC ALLOY; SEVERE PLASTIC-DEFORMATION; GRAIN-REFINEMENT; MICROSTRUCTURE EVOLUTION; HOT; ECAP; ALUMINUM-ALLOY-2219; BEHAVIOR;
D O I
10.4028/www.scientific.net/MSF.794-796.784
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Mechanisms of dynamic recrystallization operating at severe plastic deformation in a wide temperature range are reviewed for aluminum alloys. The main mechanism of grain refinement in all aluminum alloys is continuous dynamic recrystallization (CDRX). Temperature, deformation process and distribution of secondary phases strongly affect the CDRX mechanism. Initial formation of geometrically necessary boundaries (GNBs) and a dispersion of nanoscale particles accelerate CDRX facilitating the formation of a 3D network of low-angle boundaries (LAB) followed by their gradual transformation to high-angle boundaries (HAB). At high and intermediate temperatures, 3D networks of LABs may evolve due to rearrangement of lattice dislocations by climb, and mutual intersection of GNB, respectively. At high temperatures, in aluminum alloys containing no nanoscale dispersoids the CDRX occurs through the impingement of initial boundaries forced by deformation-induced LABs. This recrystallization process is termed as geometric dynamic recrystallization (GDRX). At low temperatures, the extensive grain refinement occurs through a continuous reaction which is distinguished from CDRX by restricted rearrangement of lattice dislocation. Introduction of large misorientation may occur through the formation of 3D networks of GNBs, only.
引用
收藏
页码:784 / 789
页数:6
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