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126 results on '"Stróż, Danuta"'

4. Influence of Zirconium on the Microstructure, Selected Mechanical Properties, and Corrosion Resistance of Ti 20 Ta 20 Nb 20 (HfMo) 20−x Zr x High-Entropy Alloys.

Author

Glowka, Karsten, Zubko, Maciej, Świec, Paweł, Prusik, Krystian, Szklarska, Magdalena, and Stróż, Danuta

Subjects
CORROSION resistance, TANTALUM, ZIRCONIUM, MICROSTRUCTURE, PHYSIOLOGIC salines, SCANNING electron microscopy, ALLOYS
Abstract

The presented work considers the influence of the hafnium and molybdenum to zirconium ratio of Ti20Ta20Nb20(HfMo)20−xZrx (where x = 0, 5, 10, 15, 20 at.%) high-entropy alloys in an as-cast state for potential biomedical applications. The current research continues with our previous results of hafnium's and molybdenum's influence on a similar chemical composition. In the presented study, the microstructure, selected mechanical properties, and corrosion resistance were investigated. The phase formation thermodynamical calculations were also applied to predict solid solution formation after solidification. The calculations predicted the presence of multi-phase, body-centred cubic phases, confirmed using X-ray diffraction and scanning electron microscopy. The chemical composition analysis showed the segregation of alloying elements. Microhardness measurements revealed a decrease in microhardness with increased zirconium content in the studied alloys. The corrosion resistance was determined in Ringer's solution to be higher than that of commercially applied biomaterials. The comparison of the obtained results with previously reported data is also presented and discussed in the presented study. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Influence of Hafnium Addition on the Microstructure, Microhardness and Corrosion Resistance of Ti 20 Ta 20 Nb 20 (ZrMo) 20−x Hf x (where x = 0, 5, 10, 15 and 20 at.%) High Entropy Alloys.

Author

Glowka, Karsten, Zubko, Maciej, Gębura, Sandra, Świec, Paweł, Prusik, Krystian, Szklarska, Magdalena, and Stróż, Danuta

Subjects
CORROSION resistance, ALLOY powders, HAFNIUM, BODY centered cubic structure, MOLYBDENUM, VACUUM arcs, MICROHARDNESS, ALLOYS, POWDERS
Abstract

The presented work aimed to investigate the influence of the hafnium/(zirconium and molybdenum) ratio on the microstructure, microhardness and corrosion resistance of Ti20Ta20Nb20(ZrMo)20−xHfx (where x = 0, 5, 10, 15 and 20 at.%) high entropy alloys in an as-cast state produced from elemental powder and obtained via the vacuum arc melting technique. All studied alloys contained only biocompatible elements and were chosen based on the thermodynamical calculations of phase formation predictions after solidification. Thermodynamical calculations predicted the presence of multi-phase, body-centered cubic phases, which were confirmed using X-ray diffraction and scanning electron microscopy. Segregation of alloying elements was recorded using elemental distribution maps. A decrease in microhardness with an increase in hafnium content in the studied alloys was revealed (512–482 HV1). The electrochemical measurements showed that the studied alloys exhibited a high corrosion resistance in a simulated body fluid environment (breakdown potential 4.60–5.50 V vs. SCE). [ABSTRACT FROM AUTHOR]

Published
2023
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21. Microstructure of multi-component ni35ti35ta10co10cu10 alloy

Author

Glowka, Karsten, Zubko, Maciej, Świec, Paweł, Prusik, Krystian, Dercz, Grzegorz, Matyja, Edyta, and Stróż, Danuta

Subjects
Multi-component alloys, Condensed Matter::Materials Science, High Entropy Alloys
Abstract

A new NiTi-based multi-component Ni35Ti35Ta10Co10Cu10 (at.%) alloy was obtained by vacuum arc melting. The microstructure of the alloy has been studied using scanning and transmission electron microscopy, backscatter electron diffraction and X-ray diffraction techniques. The performed measurements showed presence of two cubic and one tetragonal phases. Energy dispersive X-ray spectroscopy analysis confirmed that all the observed phases contained all five principal elements.

Published
2019

22. Characterization of long-term corros ion performance of ti15mo alloyin saline solution

Author

Szklarska, Magdalena, Łosiewicz, Bożena, Dercz, Grzegorz, Zubko, Maciej, Albrecht, Robert, and Stróż, Danuta

Subjects
Corrosion resistance, Biomaterial
Abstract

The Ti15Mo alloy has been studied towards long-term corrosion performance in saline solution at 37° C using electrochemical impedance spectroscopy. The physical and chemical characterization of the material were also investigated. The as-received Ti15Mo alloy exhibits a single β-phase structure. The thickness of single-layer structured oxide presented on its surface is ~4 nm. Impedance measurements revealed that the Ti15Mo alloy is characterized by spontaneous passivation in the solution containing chloride ions and formation of a double-layer structured oxide composed of a dense interlayer being the barrier layer against corrosion and porous outer layer. The thi ckness of this oxide layer, estimated based on the impedance data increases up to ~6 nm during 78 days of exposure. The obs erved fall in value of the log|Z|f = 0.01 Hz indicates a decrease in pitting corrosion resistance of Ti15Mo alloy in saline solution along with the immersion time. The detailed EIS study on the kinetics and mechanism of corrosion process and the capacitive behavior of the Ti15Mo electrode | passive layer | saline solution system was based on the concept of equivalent electrical circuit with respect to the physical meaning of the applied circuit elements. Potentiodynamic studies up to 9 V vs. SCE and SEM analysis show no presence of pitting corrosion what indicates that the Ti15Mo alloy is promising biomaterial to long-term medical applications.

Published
2019

23. Microstructure analysis of equiatomic multi-component ni20ti20ta20co20cu20 alloy

Author

Glowka, Karsten, Zubko, Maciej, Świec, Paweł, Prusik, Krystian, Dercz, Grzegorz, and Stróż, Danuta

Subjects
Condensed Matter::Materials Science, Thermodynamics, High Entropy Alloys
Abstract

An equiatomic multi-component alloy Ni20Ti20Ta20Co20Cu20 (at. %) was obtained using vacuum arc melting. In order to characterize such an alloy, microstructure analysis has been performed using Scanning and Transmission Electron Microscopy, Electron Backscattered Diffraction, X-ray Diffraction and Energy Dispersive X-ray Spectroscopy techniques. Microstructure analysis revealed the presence of one rhombohedral and two cubic phases. Energy Dispersive X-ray Spectroscopy measurements revealed that both observed phases include five chemical elements in the structure. Using Rietveld refinement approach the lattice parameters were refined for the observed phases.

Published
2019

37. The microstructure of annealed galfan coating on steel substrate

Author

Zelechower, M., Kliś, J., Augustyn, E., Grzonka, J., Stróż, Danuta, Rzychoń, T., and Woźnica, H.

Subjects
zinc coating, heat treatment, interface, galfan, ternary Fe-Al-Zn compounds
Abstract

The commercially available Galfan coating containing 5-7wt.% of Al deposited on the low carbon steel substrate by hot dipping has been examined with respect to the microstructure of the coating/substrate interface area. The application of several experimental techniques (SEM/EDS, XRD, TEM/AEM/EDS/ED) allowed demonstrating the two-phase structure of the alloy coating in non-treated, commercially available Galfan samples: Zn-rich pre-eutectoid phase grains are surrounded by lamellar eutectics of -Al and -Zn. The transition layer between the alloy coating and steel substrate with the considerably higher Al content (SEM/EDS, TEM/EDS) has been found in both non-treated and annealed samples (600oC/5 minutes). Only the monoclinic FeAl3Znx phase however was revealed in the annealed sample (TEM/electron diffraction) remaining uncertain the presence of the orthorhombic Fe2Al5Znx phase, reported by several authors.

Published
2012

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