|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Grain Refinement and Post Processing Phenomena in Hydrostatically Extruded Materials
||Malgorzata Lewandowska, Witold Chrominski, Agnieszka Krawczynska, Piotr Bazarnik
|On-Site Speaker (Planned)
Hydrostatic extrusion is an effective way of grain refinement as proven for various materials, including aluminium, titanium and iron based alloys. It enables to produce high strength ultrafine grained materials in relatively large quantities. However, the process of grain size refinement is strongly influenced by the grain orientation. It has been demonstrated that the microstructure after hydrostatic extrusion consists of two types of grains: (1) <111> nano-sized free of dislocations and surrounded with high angle grain boundaries and (2) <100> micron-sized with dislocation substructure. Such a microstructural heterogeneity has a strong impact on the post processing phenomena such as precipitation processes and the formation of diffusion layers. The role of various types of grain boundaries and dislocation substructure in precipitation and diffusion processes will be discussed and compared to coarse grained materials and/or ultrafine grained ones produced using other methods, e.g. equal channel angular pressing or high pressure torsion.