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High Strain Rate Deformation Behavior of 5083 Aluminum Alloy Prepared via Equal Channel Angular Extrusion  

Kim, Yang Gon (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
Ko, Young Gun (School of Materials Science and Engineering, Yeungnam University)
Shin, Dong Hyuk (Department of Metallurgy and Materials Science, Hanyang University)
Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
Publication Information
Korean Journal of Metals and Materials / v.47, no.7, 2009 , pp. 397-405 More about this Journal
Abstract
The high strain rate deformation behavior of ultra-fine grained 5083 aluminum alloys prepared via equal channel angular (ECA) extrusion was investigated in this study. The microstructure of ECA extruded specimens consisted of ultra-fine grains, and contained a considerable amount of second phase particles, which were fragmented and distributed homogeneously in the matrix. According to the dynamic torsion test results, the maximum shear stress and fracture shear strain of the route A (no rotation) specimen were lower than those of route C ($180^{\circ}$ rotation) specimen since that adiabatic shear bands of $100{\mu}m$ in width were formed in the route A specimen. The formation of adiabatic shear bands was addressed by concepts of critical shear strain, deformation energy required for void initiation, and microstructural homogeneity associated with ECA operations.
Keywords
aluminum alloy; ultra-fine grain; equal channel angular extrusion; dynamic torsion test; adiabatic shear band;
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Times Cited By Web Of Science : 9  (Related Records In Web of Science)
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