Surface topography and microstructure analysis in micro forward extrusion parts of T2 copper

A separated female die in micro forward extrusion was designed according to the characteristics of micro-forming, and a minimum pin with 0.25 mm in diameter was extruded successfully. Surface topography and microstructure analysis of micro forward extruded parts was conducted by scanning electron microscope (SEM) and metallurgical microscope. The results indicate that inhomogeneous deformation between inner and out layer materials tends to increase with the decrease of pin size or increase of grain size. Micro forward extruded pins tend to curve with the decrease of specimen dimensions; Microstructure distribution of micro parts in the landscape and fore-and-aft orientation indicate the inhomogeneity of deformation in micro forward extrusion.