Bergmann, MarkusMarkusBergmannSterzing, AndreasAndreasSterzingLandgrebe, DirkDirkLandgrebe2022-03-122022-03-122015https://publica.fraunhofer.de/handle/publica/38912010.4028/www.scientific.net/AMM.794.166Designing material characteristics by grain refinement using Severe Plastic Deformation (SPD) is an attractive way to create outstanding material properties. This paper presents a unique method which combines SPD and impact extrusion. The extrusion die is designed to create additional material deformation to a defined depth, resulting in a gradient from ultra-fine grained to coarse grained microstructure. Due to the large gradient the method is called gradation extrusion. The paper presents a new analytical calculation method and a numerical evaluation of the strain, showing the relationship between tool design and achievable effects and provides initial experimental results.enformingmetalsevere plastic deformation620670conference paper