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EFFECT OF ANNEALING TEMPERATURE ON DYNAMIC DEFORMATION BEHAVIOR OF ULTRA-FINE-GRAINED ALUMINUM ALLOYS FABRICATED BY EQUAL CHANNEL ANGULAR PRESSING

Title
EFFECT OF ANNEALING TEMPERATURE ON DYNAMIC DEFORMATION BEHAVIOR OF ULTRA-FINE-GRAINED ALUMINUM ALLOYS FABRICATED BY EQUAL CHANNEL ANGULAR PRESSING
Authors
Kim, YGKo, YGShin, DHLee, CSLee, S
POSTECH Authors
Lee, CS
Date Issued
Jan-2008
Publisher
KOREAN INST METALS MATERIALS
Abstract
The influence of annealing treatment on dynamic deformation behavior of ultra-fine grained aluminum alloys was investigated in this study. After equal-channel angular pressing at 200 degrees C, most of the grains were considerably reduced to nearly equiaxed grains of 0.3 mu m in size. With an increment of various annealing treatments for 1 hour, resultant microstructures were found to be fairly stable at temperatures up to 200 degrees C, suggesting that static recovery would be dominantly operative, whereas grain growth was pronounced above 250 degrees C. The tensile test results showed that yield and ultimate tensile strengths decreased, but elongation-to-failure and strain hardening rate increased with increasing annealing temperature. The dynamic deformation behavior retrieved with a series of torsional tests was explored with respect to annealed microstructures. Such mechanical response was analyzed in relation to resultant microstructure and fracture mode.
Keywords
aluminum alloy; ultra-fine grained structure; annealing; dynamic torsional test; SEVERE PLASTIC-DEFORMATION; LOW-CARBON STEEL; STRAIN-HARDENING BEHAVIOR; TORSIONAL DEFORMATION; MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; NANOSTRUCTURED METAL; TENSILE DEFORMATION; DUCTILITY; EXTRUSION
URI
http://oasis.postech.ac.kr/handle/2014.oak/28625
ISSN
1738-8228
Article Type
Article
Citation
JOURNAL OF THE KOREAN INSTITUTE OF METALS AND MATERIALS, vol. 46, no. 9, page. 563 - 571, 2008-01
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 LEE, CHONG SOO
Graduate Institute of Ferrous Technology
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