Effects of temperature

extrusion speed and friction coefficient on the stress distribution in the extrusion forming process of Ti-1023 alloy were simulated by DEFORM-3Dfinite element software.The microstructure evolution law of the Ti-1023 alloy during extrusion process was simulated by the cellular automaton（CA）method.The results show that the stress distribution under different extrusion conditions is different

and the stress concentration appears in the extrusion die gate

and frictional force has a relatively effect on stress distribution.The microstructure simulation shows that the dynamic recrystallization in the alloy can be observed at the stable extrusion stage with the increase of the extrusion deformation

and the grain size is refined.The dynamic recrystallization softening effect leads to the extrusion load decrease from peak and to be relatively stable.The average grain size is decreased with the extrusion speed increase at the same deformation rate.