LAUSR

Abstract During micro forming, the properties of grains in a deformation zone made inhomogeneous and difficult to predict its behavior. It affects the performance and product quality in terms of defect, dimensional accuracy and surface finish of the micro-formed metallic parts. This paper discusses the size effect related deformation behavior of magnesium AZ80 alloy which will help to understand the mechanisms and fundamentals in producing the micro implants using micro forward extrusion process. Further, the effects of micro scaling in terms of material behavior during forward extrusion are investigated using a forming assembly in conjunction with a loading set-up. The results reveal that the Mg AZ80 alloy of decreasing grain size increases the flow stress. Similarly, surface roughness by fine grains is better than the coarse grains due to lower friction between the die-specimen interfaces. The results also show that the process has great potential to develop into a promising method in manufacturing the high strength micro components and implants by controlling grain refinement.