Grain refinement in a commercial Al-Mg-Sc alloy under hot ECAP conditions

被引：70
作者：
Sitdikov, O.
Sakai, T.
Avtokratova, E.
Kaibyshev, R.
Kimura, Y.
Tsuzaki, K.
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Inst Met Superplast Problems, Ufa 450001, Russia
[3] Univ Electrocommun, Dept Mech Engn & Intelligent Syst, Chofu, Tokyo 1828585, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 444卷 / 1-2期
关键词：
intense plastic straining (IPS); aluminum alloys; hot working; equal-channel angular pressing (ECAP); grain refining; deformation bands;
D O I：
10.1016/j.msea.2006.06.081
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Grain refinement taking place during equal-channel angular pressing (ECAP) was studied in a commercial Al-6% Mg-0.4% Mn-0.3% Sc alloy at a temperature of 450 degrees C (similar to 0.8T(m)) to demonstrate the feasibility of obtaining new fine-grained structure in a hard-to-deform Al-Mg-Sc alloy under hot intense plastic straining (IPS) conditions and investigate the evolution process of new grains. Inhomogeneous deformation occurring during hot ECAP leads to formation of deformation bands. Repeated ECAP results in mutual crossing and increase in number and the misorientation of deformation bands, followed by transformation of the boundaries of deformation bands into high-angle ones. As a result, a new fine-grained microstructure with an average crystallite size of 2.8 mu m develops at large strains above 8. It is concluded that grain refinement occurs in accordance with deformation-induced continuous reactions; that is similar to in-situ or continuous dynamic recrystallization. The mechanisms of new grain evolution, as well as factors promoting grain refinement, are discussed in detail. (c) 2006 Published by Elsevier B.V.
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页码：18 / 30
页数：13
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