Influence of Strain Rate on Recrystallization Behavior of High Purity Aluminum by Tube High-pressure Shearing

摘要

The recrystallization behavior of ultra-high purity aluminum (99.999%) during tube high-pressure shearing (t-HPS) was studied at the average strain rate of 0.2s~(-1) and 1.2s~(-1) respectively. The microstructure after t-HPS was characterized by electron backscatter diffraction (EBSD). Different recrystallization behavior at different strain rate of t-HPS was observed by the distinct microstructure evolution. The results showed that at higher strain rate, a finer grain size and higher recrystallization fraction were obtained. While the difference of recrystallization fraction between higher and lower strain rate decreased with increasing strain level. It has the potential for producing gradient materials as there is a grain size gradient along the direction of shear plane normal (SPN) which is more pronounce at strain level of ε=5.8.