期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 344, 期 1-2, 页码 348-356出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(02)00440-9
关键词
hot deformation; aluminum alloy; as-cast structure; grain refinement; grain boundary sliding; deformation band
Grain refinement in an as-cast 0.16%Zr modified 7475 aluminum alloy was studied by means of compression at 490 degreesC and metallographic observations. The sigma versus epsilon behavior shows a significant strain softening just after yielding and an apparent steady-state flow at strains of above 0.3. The structural changes are mainly characterized by development of deformation bands at an early stage of deformation (epsilon less than or equal to 0.3), followed by new grain evolution during steady-state flow due to operation of grain boundary sliding (GBS). GBS can result in local lattice rotation and formation of deformation bands in the as-cast coarse grain interiors. The number and the misorientation angle of deformation bands increase with deformation, followed by evolution of new grains in high strain. It is concluded that grain refinement occurs by a deformation-induced continuous reaction; that is continuous dynamic recrystallization (CDRX). A key role of GBS and second phase dispersoids on CDRX is discussed in detail. (C) 2002 Elsevier Science B.V. All rights reserved.
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