期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.06.081
关键词
intense plastic straining (IPS); aluminum alloys; hot working; equal-channel angular pressing (ECAP); grain refining; deformation bands
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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