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In Situ Observation of Adiabatic Shear Band Formation in Aluminum Alloys |
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| Authors: | Nie Y Claus B Gao J Zhai X Kedir N Chu J Sun T Fezzaa K Chen W W |
| Institution: | 1.School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN, 47907, USA ;2.School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA ;3.Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA ; |
| Abstract: | We used high-speed X-ray phase contrast imaging and infrared thermal imaging techniques to study the formation processes of adiabatic shear bands in aluminum 7075-T6 and 6061-T6 alloys. A modified compression Kolsky bar setup was used to apply the dynamic loading. A flat hat-shaped specimen design was adopted for generating the shear bands at the designated locations. Experimental results show that 7075-T6 exhibits less ductility and a narrower shear band than 6061-T6. Maximum temperatures of 720 K and 770 K were locally determined within the shear band zones for 7075-T6 and 6061-T6 respectively. This local high temperature zone and the resulting thermal instability were found to relate to the shear band formation in these aluminum alloys. |
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