Abstract
ABSTRACTIn the present work, the uniaxial compressive mechanical proper\ ies of ultrafine grained (UFG) aluminum produced by equal channel angular pressing method were investigated experimentally over a wide temperatures ranging from 77 to 473 K under both quasi-static and dynamic loading conditions. Based on the experimental results, the strain rate, temperature sensitivity, and the apparent activation volume were estimated. The coupling effects of both experimental temperature and applied strain rate on thermal-activated plastic deformation behavior were also investigated. Based on the thermal activation theory, the rate-controlling mechanisms for the UFG aluminum under both quasi-static and dynamic loading conditions were discussed.
Highlights
Over hundreds of years, engineers are searching for lightweight and strong materials which were driven by both commercial and defense applications
It should be noted that as the plastic deformation resistances or flow stresses of metals and alloys depend on the microstructure of the material as well as the strain rate and temperature associated with the loading, investigations on the strain rate and temperature sensitivity (TS) of mechanical properties of ultrafine grained (UFG) materials are of great importance for extending our understanding about UFG/NC metals [3,5]
It can be seen that the UFG-Al displays higher strength as the grain size is reduced into ultrafine grain regime, which can be fully explained via the classic Hall–Petch relationship, that is, σy 1⁄4 σ0 þ kHÀPdÀ1=2
Summary
Engineers are searching for lightweight and strong materials which were driven by both commercial and defense applications. It should be noted that as the plastic deformation resistances or flow stresses of metals and alloys depend on the microstructure of the material as well as the strain rate and temperature associated with the loading, investigations on the strain rate and temperature sensitivity (TS) of mechanical properties of UFG materials are of great importance for extending our understanding about UFG/NC metals [3,5].
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