| Partner: Agnieszka Krawczyńska |
|
Recent publications
| 1. | Gloc M.♦, Przybysz S.♦, Dulnik J., Kołbuk-Konieczny D., Wachowski M.♦, Kosturek R.♦, Ślęzak T.♦, Krawczyńska A.♦, Ciupiński ♦, A Comprehensive Study of a Novel Explosively Hardened Pure Titanium Alloy for Medical Applications, Materials, ISSN: 1996-1944, DOI: 10.3390/ma16227188, Vol.16, No.22, pp.7188--1-19, 2023 Abstract: Pure titanium is gaining increasing interest due to its potential use in dental and orthopedic applications. Due to its relatively weak mechanical parameters, a limited number of components manufactured from pure titanium are available on the market. In order to improve the mechanical parameters of pure titanium, manufacturers use alloys containing cytotoxic vanadium and aluminum. This paper presents unique explosive hardening technology that can be used to strengthen pure titanium parameters. The analysis confirms that explosive induced α-ω martensitic transformation and crystallographic anisotropy occurred due to the explosive pressure. The mechanical properties related to residual stresses are very nonuniform. The corrosion properties of the explosive hardened pure titanium test do not change significantly compared to nonhardened titanium. The biocompatibility of all the analyzed samples was confirmed in several tests. The morphology of bone cells does not depend on the titanium surface phase composition and crystallographic orientation. Keywords:explosive hardening, pure titanium, bioimplants, titanium alloys Affiliations:
|  | |||||||||||||||||||||||||||
| 2. | Maździarz M., Psiuk R., Krawczyńska A.♦, Lewandowska M.♦, Mościcki T., Effect of zirconium doping on the mechanical properties of W1−xZrxB2 on the basis of first‑principles calculations and magnetron sputtered films, ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING, ISSN: 1644-9665, DOI: 10.1007/s43452-022-00513-6, Vol.22, No.193, pp.1-30, 2022 Abstract: Potentially superhard W1−xZrxB2 polymorphs, hP6-P63/mmc-WB2 and hP3-P6/mmm-WB2 , were thoroughly analyzed with zirconium doping in the range of x=0-25%, within the framework of the first-principles density functional theory, from both a structural and a mechanical point of view. The obtained results were subsequently compared with the properties of material deposited by the magnetron sputtering method. All predicted structures are mechanically and thermodynamically stable. Theoretical calculations suggest a decrease in hardness Hv and fracture toughness KIC of the hP6 phase with zirconium doping but no such effect on the hP3 phase. It was observed that an additional defect in the analyzed structure significantly weakens the hP6 phase but strengthens the hP3 phase. The deposited films are characterized by greater hardness but lower fracture toughness. The results of experiments show that not only is solid solution hardening responsible for strengthening the predicted new material but also the change in microstructure, the Hall–Petch effect and vacancies. Keywords:Ab initio, Transition metal borides, Mechanical properties, Magnetron sputtered coatings, Hardness Affiliations:
| |