Institute of Fundamental Technological Research
Polish Academy of Sciences

Staff

Hanna Ćwieka, MSc

Department of Experimental Mechanics (ZMD)
Division of Technological Laser Applications (PTZL)
position: lab technician
telephone: (+48) 22 826 12 81 ext.: 236
room: 034
e-mail:

Recent publications
1.  Zeller-Plumhoff B., Laipple D., Słomińska H., Iskhakova K., Longo E., Hermann A., Flenner S., Greving I., Storm M., Willumeit-Romer R., Evaluating the morphology of the degradation layer of pure magnesium via 3D imaging at resolutions below 40 nm, Bioactive Materials, ISSN: 2452-199X, DOI: 10.1016/j.bioactmat.2021.04.009, Vol.6, No.12, pp.4368-4376, 2021

Abstract:
Magnesium is attractive for the application as a temporary bone implant due to its inherent biodegradability, non-toxicity and suitable mechanical properties. The degradation process of magnesium in physiological environments is complex and is thought to be a diffusion-limited transport problem. We use a multi-scale imaging approach using micro computed tomography and transmission X-ray microscopy (TXM) at resolutions below 40 nm. Thus, we are able to evaluate the nanoporosity of the degradation layer and infer its impact on the degradation process of pure magnesium in two physiological solutions. Magnesium samples were degraded in simulated body fluid (SBF) or Dulbecco's modified Eagle's medium (DMEM) with 10% fetal bovine serum (FBS) for one to four weeks. TXM reveals the three-dimensional interconnected pore network within the degradation layer for both solutions. The pore network morphology and degradation layer composition are similar for all samples. By contrast, the degradation layer thickness in samples degraded in SBF was significantly higher and more inhomogeneous than in DMEM+10%FBS. Distinct features could be observed within the degradation layer of samples degraded in SBF, suggesting the formation of microgalvanic cells, which are not present in samples degraded in DMEM+10%FBS. The results suggest that the nanoporosity of the degradation layer and the resulting ion diffusion processes therein have a limited influence on the overall degradation process. This indicates that the influence of organic components on the dampening of the degradation rate by the suppression of microgalvanic degradation is much greater in the present study.

Keywords:
magnesium degradation, porosity, transmission X-ray microscopy, 3D imaging

Affiliations:
Zeller-Plumhoff B. - other affiliation
Laipple D. - other affiliation
Słomińska H. - IPPT PAN
Iskhakova K. - other affiliation
Longo E. - other affiliation
Hermann A. - other affiliation
Flenner S. - other affiliation
Greving I. - other affiliation
Storm M. - other affiliation
Willumeit-Romer R. - other affiliation
2.  Zeller-Plumhoff B., Gile M., Priebe M., Słomińska H., Boll B., Wiese B., Würger T., Willumeit-Römer R., Horst Meißner R., Exploring key ionic interactions for magnesium degradation in simulated body fluid – a data-driven approach, Corrosion Science, ISSN: 0010-938X, DOI: 10.1016/j.corsci.2021.109272, Vol.182, pp.1-109272-13, 2021

Abstract:
We have studied the degradation of pure magnesium wire in simulated body fluid and its subsets under physiological conditions to enable the prediction of the degradation rate based on the medium's ionic composition. To this end, micro-computed tomography and scanning electron microscopy with energy-dispersive X-ray spectroscopy were used, followed by a tree regression analysis. A non-linear relationship was found between degradation rate and the precipitation of calcium salts. The mean absolute error for predicting the degradation rate was 1.35 mm/yr. This comparatively high value indicates that ionic interactions were exceedingly complex or that an unknown parameter determining the degradation may exist.

Keywords:
magnesium degradation, simulated body fluid, MicroCT, tree regression

Affiliations:
Zeller-Plumhoff B. - other affiliation
Gile M. - other affiliation
Priebe M. - other affiliation
Słomińska H. - IPPT PAN
Boll B. - other affiliation
Wiese B. - other affiliation
Würger T. - other affiliation
Willumeit-Römer R. - other affiliation
Horst Meißner R. - other affiliation
3.  Meyer S., Wolf A., Sanders D., Iskhakova K., Ćwieka H., Bruns S., Flenner S., Greving I., Hagemann J., Willumeit-Römer R., Wiese B., Zeller-Plumhoff B., Degradation analysis of thin Mg-xAg wires using X-ray near-field holotomography, Metals, ISSN: 2075-4701, DOI: 10.3390/met11091422, Vol.11, No.9, pp.1422-1-12, 2021

Abstract:
Magnesium–silver alloys are of high interest for the use as temporary bone implants due to their antibacterial properties in addition to biocompatibility and biodegradability. Thin wires in particular can be used for scaffolding, but the determination of their degradation rate and homogeneity using traditional methods is difficult. Therefore, we have employed 3D imaging using X-ray near-field holotomography with sub-micrometer resolution to study the degradation of thin (250 μm diameter) Mg-2Ag and Mg-6Ag wires. The wires were studied in two states, recrystallized and solution annealed to assess the influence of Ag content and precipitates on the degradation. Imaging was employed after degradation in Dulbecco’s modified Eagle’s medium and 10% fetal bovine serum after 1 to 7 days. At 3 days of immersion the degradation rates of both alloys in both states were similar, but at 7 days higher silver content and solution annealing lead to decreased degradation rates. The opposite was observed for the pitting factor. Overall, the standard deviation of the determined parameters was high, owing to the relatively small field of view during imaging and high degradation inhomogeneity of the samples. Nevertheless, Mg-6Ag in the solution annealed state emerges as a potential material for thin wire manufacturing for implants.

Keywords:
X-ray computed tomography, magnesium-silver alloy, wire, degradation, near-field holotomography

Affiliations:
Meyer S. - other affiliation
Wolf A. - other affiliation
Sanders D. - other affiliation
Iskhakova K. - other affiliation
Ćwieka H. - IPPT PAN
Bruns S. - other affiliation
Flenner S. - other affiliation
Greving I. - other affiliation
Hagemann J. - other affiliation
Willumeit-Römer R. - other affiliation
Wiese B. - other affiliation
Zeller-Plumhoff B. - other affiliation
4.  Zeller-Plumhoff B., Robisch A.L., Pelliccia D., Longo E., Słomińska H., Hermann A., Krenkel M., Storm M., Estrin Y., Willumeit-Römer R., Salditt T., Orlov D., Nanotomographic evaluation of precipitate structure evolution in a Mg–Zn–Zr alloy during plastic deformation, Scientific Reports, ISSN: 2045-2322, DOI: 10.1038/s41598-020-72964-x, Vol.10, pp.16101-1-9, 2020

Abstract:
Magnesium and its alloys attract increasingly wide attention in various fields, ranging from transport to medical solutions, due to their outstanding structural and degradation properties. These properties can be tailored through alloying and thermo-mechanical processing, which is often complex and multi-step, thus requiring in-depth analysis. In this work, we demonstrate the capability of synchrotron-based nanotomographic X-ray imaging methods, namely holotomography and transmission X-ray microscopy, for the quantitative 3D analysis of the evolution of intermetallic precipitate (particle) morphology and distribution in magnesium alloy Mg–5.78Zn-0.44Zr subjected to a complex multi-step processing. A rich history of variation of the intermetallic particle structure in the processed alloy provided a testbed for challenging the analytical capabilities of the imaging modalities studied. The main features of the evolving precipitate structure revealed earlier by traditional light and electron microscopy methods were confirmed by the 3D techniques of synchrotron-based X-ray imaging. We further demonstrated that synchrotron-based X-ray imaging enabled uncovering finer details of the variation of particle morphology and number density at various stages of processing—above and beyond the information provided by visible light and electron microscopy.

Affiliations:
Zeller-Plumhoff B. - other affiliation
Robisch A.L. - other affiliation
Pelliccia D. - other affiliation
Longo E. - other affiliation
Słomińska H. - other affiliation
Hermann A. - other affiliation
Krenkel M. - other affiliation
Storm M. - other affiliation
Estrin Y. - other affiliation
Willumeit-Römer R. - other affiliation
Salditt T. - other affiliation
Orlov D. - other affiliation
5.  Mościcki T., Psiuk R., Słomińska H., Levintant-Zayonts N., Garbiec D., Pisarek M., Bazarnik P., Nosewicz S., Chrzanowska-Giżyńska J., Influence of overstoichiometric boron and titanium addition on the properties of RF magnetron sputtered tungsten borides, SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2020.125689, Vol.390, pp.125689-1-12, 2020

Abstract:
In this work, (W,Ti)B2 films with different stoichiometric ratio Ti/W deposited on silicon and 304 stainless steel by radio frequency magnetron sputtering are presented. The coatings were deposited from plasma spark sintered targets obtained from the mixture of pure boron, tungsten and titanium powders. It is shown that during plasma spark sintering process using overstoichiometric boron and a low content of titanium change the WB2 to WB4 phase with almost no secondary phases. Subsequently, the impact of titanium content on the films properties is investigated systematically, including the chemical and phase composition, crystalline structure, surface and cross-section morphology. Simultaneously, nano-indentation test and ball-on-disk tribometery are performed to analyse the hardness and tribological properties of the films. It is shown that deposited films with titanium content of 3.6 and 5.5 at.% are formed in the zone T of the Thornton's Structural Zone Model. In opposite to α-WB2 magnetron sputtered coatings they are more flexible and hard nanocomposite coatings. The results show that the addition of titanium is apparently changing the film structure from nanocrystalline columnar to amorphous, very dense and compact structure with the addition of TiB2 phase. That films are simultaneously hard (H > 37.5 GPa), have high hardness to effective Young's modulus ratio values (H/E* > 0.1) and elastic recovery (We > 60%) appropriate for tough and resistant to cracking materials. The presented (W,Ti)B2 films exhibit also tribological and corrosion properties better than unalloyed coatings.

Keywords:
superhard films, ternary tungsten borides, RF magnetron sputtering, wear resistance, corrosion

Affiliations:
Mościcki T. - IPPT PAN
Psiuk R. - IPPT PAN
Słomińska H. - IPPT PAN
Levintant-Zayonts N. - IPPT PAN
Garbiec D. - Metal Forming Institute, Poznań (PL)
Pisarek M. - other affiliation
Bazarnik P. - Warsaw University of Technology (PL)
Nosewicz S. - IPPT PAN
Chrzanowska-Giżyńska J. - IPPT PAN
6.  Krajewski M., Tokarczyk M., Stefaniuk T., Słomińska H., Małolepszy A., Kowalski G., Lewińska S., Ślawska-Waniewska A., Magnetic-field-induced synthesis of amorphous iron-nickel wire-like nanostructures, MATERIALS CHEMISTRY AND PHYSICS, ISSN: 0254-0584, DOI: 10.1016/j.matchemphys.2020.122812, Vol.246, pp.122812-1-7, 2020

Abstract:
Manufacturing process of wire-like binary or ternary metal nanoalloys applying the magnetic-field-induced (MFI) synthesis is still a challenging task. Hence, this work demonstrates for the first time how to produce the iron-nickel wire-like nanostruc-tures with Fe0.75Ni0.25, Fe0.5Ni0.5 and Fe0.25Ni0.75 compositions. In a contrary to the previously reported synthesis of the Fe-Ni wire-like nanomaterials, this process has been carried out at room temperature without employment of templates, surfactants, organic solvents, and other chemical additives. The as-prepared samples exhibit specific structures with the amorphous bimetallic alloy cores covered by thin amorphous oxide shells. Moreover, they are composed of nanoparticles which are aligned in nearly linear chains. The Fe-Ni samples are ferromagnetic materials. Their coercivity values and saturation magnetizations depend on chemical compositions and dimensions of the investigated chains. The highest saturation magnetization and the lowest coercivity is found for the material with the lowest content of nickel and vice versa.

Keywords:
amorphous materials, Fe–Ni chains, magnetic-field-induced synthesis, magnetic materials, wire-like nanostructure

Affiliations:
Krajewski M. - IPPT PAN
Tokarczyk M. - University of Warsaw (PL)
Stefaniuk T. - University of Warsaw (PL)
Słomińska H. - IPPT PAN
Małolepszy A. - Warsaw University of Technology (PL)
Kowalski G. - University of Warsaw (PL)
Lewińska S. - Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A. - other affiliation
7.  Psiuk R., Słomińska H., Hoffman J., Mościcki T., Super-hard films W-B and W-Ti-B deposited from targets sintered by SPS method / Supertwarde warstwy W-B i W-Ti-B osadzane z tarcz spiekanych metodą SPS, Metal Forming, ISSN: 0867-2628, Vol.30, No.2, pp.107-120, 2019

Abstract:
With increasing demand for high-performance and long-lasting cutting and forming tools, the members of this expanding class of superhard metals hold promise to address the shortcomings of traditional tool materials. Those shortcoming include their high cost (silicon nitride, cubic boron nitride, and diamond), their inability to cut ferrous metals due to chemical reactions (diamond), instability in the presence of humidity (cubic boron nitride) and relatively low hardness (tungsten carbide). Also the increasing industrial demand for protective coatings with high hardness, good elastic properties and thermal stability calls for the investigation of new material systems. Although transition metal (TM) nitrides are successfully applied for different tasks in automotive or aero-space industries, the search for improved materials is an ongoing topic, being far from its end. In this work the study on deposition of thin films made of new super-hard materials (SHM) such as tungsten boride are presented. Additionally, the influence of doping by titanium of those materials is investigated. Investigated films were deposited by the pulsed laser deposition method. The used targets were synthetized by SPS method. The powders of boron and tungsten in 4.5 to 1 molar faction were used. The films deposited by PLD method have stoichiometric composition such as used targets. The WB2 and WB3 phase are dominant. Research carried out using SEM, XRD and nanoindentation test showed that the phase composition of the targets is more important in the case of laser deposition than magnetron. All obtained layers are very hard and thermally stable. In the case of magnetron sputtering, smooth layers were obtained while the layers deposited by the laser have a very high roughness. Titanium doping increases the amount of WB3 phase in the sintered discs, while it has no significant effect on the properties of the deposited layers.
Z rosnącym zapotrzebowaniem na niezawodne, a jednocześnie zapewniające dużą wydajność, narzędzia do skrawania i obróbki plastycznej, coraz większego znaczenia nabiera rozszerzająca się grupa supertwardych ceramik przewodzących prąd. Materiały te dobrze rokują w związku z rozwiązaniem problemów tradycyjnych materiałów narzędziowych, których niedoskonałości obejmują wysoką cenę (azotek krzemu, azotek boru), niezdolność do cięcia stopów żelaza w wyniku reakcji chemicznych (diament), niestabilność w obecności wilgoci (azotek boru) i względnie małą twardość (węglik wolframu). Również rosnący popyt na powłoki ochronne o wysokiej twardości, o dobrych właściwościach sprężystych i stabilności termicznej powoduje, że badania nad nowymi systemami materiałowymi prowadzone są coraz intensywniej. Pomimo że azotki metali przejściowych są już z powodzeniem stosowane do różnych zadań w przemyśle samochodowym i lotniczym, poszukiwanie ulepszonych materiałów jest tematem wciąż aktualnym. W pracy przedstawiono badania nad osadzaniem cienkich powłok z nowych supertwardych materiałów (SHM), którymi są borki wolframu. Dodatkowo zbadano wpływ domieszkowania tych materiałów tytanem. Warstwy osadzane były metodą ablacji laserowej PLD. Tarcze do osadzania zsyntetyzowane zostały metodą spiekania plazmowego SPS proszków boru i wolframu o stosunku atomów 4,5 do 1. Osadzane z użyciem lasera warstwy mają skład stechiometryczny podobny do użytych tarcz. W warstwach tych dominuje faza WB3. Badania przeprowadzone z użyciem SEM, XRD i nanoindentacji wykazały, że skład fazowy tarcz jest odwzorowany w warstwach osadzonych laserem. Wszystkie uzyskane warstwy są bardzo twarde i stabilne termicznie. Warstwy osadzane laserem odznaczają się dużą chropowatością. Domieszkowanie tytanem zwiększa ilość fazy WB3 w spiekanych tarczach i osadzanych warstwach oraz zmniejsza ilość i wielkość naniesionych na powierzchnię cząstek.

Keywords:
laser ablation, tungsten borides doped titanium, plasma sintering / ablacja laserowa, borki wolframu domieszkowane tytanem, spiekanie plazmowe

Affiliations:
Psiuk R. - IPPT PAN
Słomińska H. - IPPT PAN
Hoffman J. - IPPT PAN
Mościcki T. - IPPT PAN
8.  Gloc M., Słomińska H., Ciupiński Ł., Hydrogen Influence on Microstructure and Properties of Novel Explosive Welded Corrosion Resistant Clad Materials, DEFECT AND DIFFUSION FORUM, ISSN: 1662-9507, DOI: 10.4028/www.scientific.net/DDF.382.167, Vol.382, pp.167-172, 2018

Abstract:
The aim of this work was to investigate whether the explosively welded metals are susceptible to hydrogen degradation. The materials described in this article are widely used nickel alloy Inconel C-276 and super duplex steel SAF 2507 as clad materials for their superior resistance to corrosive environment and low alloy steel P355NH as a base material. It was observed that at the explosive bonded interface between the base steel and the stainless steel some local melting zones are formed. It was found that the cathodic hydrogen charging causes changes in the microstructure of bonded materials and decreases the shear strength of bonds as well as the corrosion resistance of clads.

Keywords:
novel materials, explosive welding, hydrogen degradation

Affiliations:
Gloc M. - Warsaw University of Technology (PL)
Słomińska H. - other affiliation
Ciupiński Ł. - Warsaw University of Technology (PL)

Conference abstracts
1.  Mościcki T., Psiuk R., Słomińska H., Influence of titanium addition on the phase composition and properties of tungsten borides thin films, PLATHINIUM, Plasma Thin film International Union Meeting, 2019-09-23/09-27, Antibes (FR), pp.1-2, 2019
2.  Psiuk R., Słomińska H., Chrzanowska-Giżyńska J., Mościcki T., Supertwarde warstwy W-B i W-Ti-B osadzane z tarcz spiekanych metodą SPC, I Ogólnopolskie Seminarium Spark Plasma Sintering, 2018-10-24/10-24, Poznań (PL), pp.25-25, 2018
3.  Słomińska H., Psiuk R., Chrzanowska-Giżyńska J., Mościcki T., The effect of titanium incorporation on the properties of W-Ti-B superhard films deposited by PLD and MS methods, NANOSMAT, 13th International Conference on Surfaces, Coatings and Nanostructured Materials, 2018-09-11/09-14, Gdańsk (PL), No.33, pp.16-17, 2018
4.  Chrzanowska-Giżyńska J., Denis P., Psiuk R., Słomińska H., Mihailescu I., Ristoscu C., Mościcki T., Szymański Z., Thin WBx and WXTi1-xB2 films deposited by combined magnetron sputtering and pulsed laser deposition technique, ICPEPA-11, 11th International Conference on Photo-Excited Processes and Applications, 2018-09-10/09-14, Vilnius (LT), No.P2, pp.113-113, 2018

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