Abstract
The high strain rate deformation behavior of extruded AZ31 magnesium alloy were characterized by Split Hopkison Tension and Pressure Bar (SHPB and SHTB). The macro- and micro- fracture morphology of the alloy under high strain rate tension and compression loading were analyses by scanning electron microscopy(SEM) and optical microscopy(OM). The tension and compression were conducted along extrusion direction and transverse direction, respectively. The results show that the macro- fracture mode of the extruded AZ31 magnesium alloy under compression and tension are all in 45 degree along loading axis. The micro- fracture morphology of high strain rate compression and tension is of anisotropy. That is the fracture ratio of ductility to brittle of extrusion direction under high strain rate compression is much higher than that of transverse direction even if both of the fracture are mixed mode of ductile and brittle. The fracture morphology of extrusion direction under high strain rate tension is characterized by ductile, while that of transverse direction is characterized by brittle.
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