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Dynamic Deformation Behavior of Ultra-Fine-Grained Pure Coppers Fabricated by Equal Channel Angular Pressing  

Kim, Yang Gon (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Hwang, Byoungchul (Ferrous Alloys Research Group Korea Institute of Materials Science)
Lee, Sunghak (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Lee, Chul Won (Ferrous Alloys Research Group Korea Institute of Materials Science)
Shin, Dong Hyuk (Department of Metallurgy and Materials Science Hangyang University)
Publication Information
Korean Journal of Metals and Materials / v.46, no.9, 2008 , pp. 545-553 More about this Journal
Abstract
Dynamic deformation behavior of ultra-fine-grained pure coppers fabricated by equal channel angular pressing (ECAP) was investigated in this study. Dynamic torsional tests were conducted on four copper specimens using a torsional Kolsky bar, and then the test data were analyzed by their microstructures and tensile properties. The 1-pass ECAP'ed specimen consisted of fine dislocation cell structures elongated along the ECAP direction, which were changed to very fine, equiaxed subgrains of 300~400 nm in size as the pass number increased. The dynamic torsional test results indicated that maximum shear stress increased with increasing ECAP pass number. Adiabatic shear bands were not found at the gage center of the dynamically deformed torsional specimen of the 1- or 4-pass ECAP'ed specimen, while some weak bands were observed in the 8-pass ECAP'ed specimen. These findings suggested that the grain refinement according to the ECAP was very effective in strengthening of pure coppers, and that ECAP'ed coppers could be used without serious reduction in fracture resistance under dynamic torsional loading as adiabatic shear bands were hardly formed.
Keywords
dynamic torsional test; ultra-fine-grained oxygen-free copper; equal channel angular pressing (ECAP);
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Times Cited By Web Of Science : 6  (Related Records In Web of Science)
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