Grant number: 0085/L-11/2019
Principal Investigator: Sylwia Przybysz from the Institute of High Pressure Physics of the Polish Academy of Sciences
Project funding: PLN 197 880 PLN
Project status: Project in progress
The project's objective is to obtain titanium with isotropic structure and enhanced mechanical properties using a combination of two methods of severe plastic deformations: hydrostatic extrusion (HE) and equal-channel angular pressing (ECAP) and post-deformation heat treatment. The appropriate variety of these processes and the post-deformation heat treatment based on low-temperature annealing will significantly reduce the material's morphological texture. The characteristic feature of the HE process is the generation of a structure with grains elongated in the direction of extrusion. This results in anisotropy of the mechanical properties of the material after the deformation process. The characteristic feature of the ECAP process is the non-uniform distribution of plastic deformations and shear stresses in the plastic deformation zone. This is favorable to the structural and mechanical heterogeneity of the deformed material. Application of the ECAP method before the HE process will allow for preliminary fragmentation of titanium microstructure, reducing the occurrence of morphological texture and related anisotropy of mechanical properties after the HE.
The study will determine the effect of both complex processes of plastic deformation, ECAP and HE, on changes in the morphological texture of titanium occurring perpendicularly and in parallel to the direction of deformation after HE and on the anisotropy of mechanical properties caused by these changes.
Since medical implants are expected to have high mechanical properties, titanium alloys containing toxic alloying additives, such as aluminum, vanadium, niobium, etc., are currently used. The subject of the study will be commercially pure titanium CP Ti (grade 2), which, after generating an isotropic, highly fragmented structure and after significantly increasing strength, will allow replacing the above alloys, eliminate the unhealthy alloy additions and will have practical application in implantology.
