Mechanical behavior and microstructure evolution during high strain rate deformation of AA7075-T651

Abstract The current study presents the effects of strain and temperature on mechanical response microstructure evolution in AA7075-T651 at high rates. Compression tests have been performed room (RT), 200, 300 400 °C using a Split-Hopkinson pressure bar (SHPB) setup with rates ranging between 1400 5300 s −1 . For deformation RT, flow stress increases increase rate. Whereas elevated temperatures show non-monotonous behavior respect to This trait is attributed pronounced from adiabatic shear bands (ASBs); namely, distorted (DSBs) transformed (TSBs); cracks resulting plastic instability during hot deformation. sequence is: inhomogeneity initial – DSB TSB crack –fracture. feasibility formation growth ASBs temperature, neglecting any significant effect During compression tests, material rises due heating. Considering certain developed material, this rise decreases as increased. Furthermore, individual processes, increasing strain. leading approximated be 0.7 times melting alloy. These results are used developing physics-based model for Article Highlights At temperatures, bars produce two types cracks. Evolution promoted by irrespective Adiabatic approximating 70% point forms refined grain structure band.