MICROSTRUCTURAL EVOLUTION IN HIGH STRAIN, HIGH STRAIN-RATE DEFORMATION
作者： K.S. VECCHIO , U. ANDRADE , M.A. MEYERS , L.W. MEYER
DOI: 10.1016/B978-0-444-89732-9.50121-7
关键词:
摘要: Under high strain rates, plastic deformation can be assumed to adiabatic, and a significant temperature increase occur at large strains. In this study, shock-hardened polycrystalline copper was subjected strains (γ ~ 5) rates (γ˙ 104 s−1) using stepped specimen in Hopkinson bar. Microstructural analysis by transmission electron microscopy revealed that the highly deformed shear-band region consisted of gradual decrease grain size with increasing strain. The center shear band is characterized very small grains (~ 0.1μm) relatively low dislocation density. An developed, based on dynamic recrystallization (enabled adiabatic temperatures rise associated deformation), predicts transient during which varies inversely rate. This has been used predict nanocrystalline sizes are achievable. dramatic microstructural refinement (from > 50μ.m < enables thermomechanical response may lead extensive, stable tension.
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