Numéro
J. Phys. IV France
Volume 01, Numéro C3, Octobre 1991
DYMAT 1991 - 3rd International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) C3-11 - C3-17
DOI http://dx.doi.org/10.1051/jp4:1991302
DYMAT 1991 - 3rd International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 01 (1991) C3-11-C3-17

DOI: 10.1051/jp4:1991302

HIGH STRAIN, HIGH STRAIN-RATE DEFORMATION OF COPPER

M.A. MEYERS1, L.W. MEYER2, K.S. VECCHIO1 and U. ANDRADE1

1  Department of Applied Mechanics and Engineering Sciences, University of California, San Diego, La Jolla, CA 92093-0411, U.S.A
2  Fraunhofer Institut für Angewandte Materialforschung, Bremen, Germany


Abstract
Shock-hardened polycrystalline copper was subjected to high strains (γ ∼ 5) at high strain rates (γ' ∼ 104 s-1) using a stepped specimen in a Hopkinson bar. Microstructural analysis by transmission electron microscopy revealed that the highly deformed region consisted of very small grains (∼ 0.1 µm) with a low dislocation density. These results are discussed in terms of dynamic recrystallization, which is enabled by the adiabatic temperatures rise associated with plastic deformation. This dramatic microstructural refinement enables a thermomechanical response that may lead to a stable plastic deformation in tension.



© EDP Sciences 1991