In Situ Observation of Adiabatic Shear Band Formation in Aluminum Alloys
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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.
KeywordsShear band formation Dynamic shear banding Kolsky Bar X-ray PCI Temperature Aluminum alloys
This material is based upon work supported in part by the U. S. Army Research Laboratory and the U. S. Army Research Office under grant number W911NF1710241. The authors also sincerely thank Alex Deriy at the APS for his professional help during our beam time, and Aaron Greco at Argonne for his cooperation in using the IR camera. This research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Funding for high-speed camera used in this work was provided by AFOSR Award No. FA9550-16-1-0315 (Dr. Martin Schmidt, Program Officer).
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