Temperature-Dependent Mechanical Response of an UFG Aluminum Alloy at High Rates |
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| Authors: | E Huskins B Cao B Li K T Ramesh |
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| Institution: | (1) Department of Mechanical Engineering, Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA;(2) Department of Materials Science and Engineering, University of Illinois, 601 East John St, Urbana-Champaign, IL 61820, USA;(3) Present address: Carrier Corporation, 4805 Carrier Parkway, TR 20, Syracuse, NY 13221, USA;(4) Present address: Center for Advanced Vehicular Systems, Mississippi State University, 200 Research Blvd., Starkville, MS 39759, USA; |
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| Abstract: | High temperature (298 K–573 K) and high strain rate (4000 s−1) compression experiments were performed on a cryomilled ultra-fine grained (UFG) Al-5083 using a modified Kolsky bar with
a heating system designed to reduce “cold contact” time. The resulting stress strain curves show a reduction in strength of
approximately 300 MPa at the highest temperature tested. This softening has been related to a thermally activated deformation
mechanism. In addition, an experimental procedure was developed to investigate the microstructure evolution during the preheating,
prior to mechanical loading, so as to identify the intrinsic mechanical response of the material at high temperatures. The
results of this procedure are in good agreement with a TEM study on material that has been heated but not loaded. |
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