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Vol.47, No.7, 397 ~ 406, 2009
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| Title |
| High Strain Rate Deformation Behavior of 5083 Aluminum Alloy Prepared via Equal Channel Angular Extrusion |
| 김양곤 Yang Gon Kim , 고영건 Young Gun Ko , 신동혁 Dong Hyuk Shin , 이성학 Sung Hak Lee |
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| 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° rotation) specimen since that adiabatic shear bands of 100 μm 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. |
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| Key Words |
| aluminum alloy, ultra-fine grain, equal channel angular extrusion, dynamic torsion test, adiabatic shear band |
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