Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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T. Płociński

Politechnika Warszawska (PL)

Ostatnie publikacje
1.  Zgłobicka I., Dobkowska A., Zielińska A., Borucińska E., Kruszewski M., Zybała R., Płociński T., Idaszek J., Jaroszewicz J., Paradowski K., Adamczyk-Cieślak B., Nikiforow K., Bucholc B., Święszkowski W., Kurzydłowski K., In-depth analysis of the influence of bio-silica filler ( Didymosphenia geminata frustules) on the properties of Mg matrix composites, Journal of Magnesium and Alloys, ISSN: 2213-9567, DOI: 10.1016/j.jma.2023.08.001, Vol.11, pp.2853-2871, 2023

Streszczenie:
A novel metal matrix composites (MMC) with Mg matrix reinforced with natural filler in the form of Didymosphenia geminata frustules (algae with distinctive siliceous shells) are presented in this work. Pulse plasma sintering (PPS) was used to manufacture Mg-based composites with 1, 5 and 10 vol.% ceramic filler. As a reference, pure Mg was sintered. The results show that the addition of 1 vol.% Didymosphenia geminata frustules to the Mg matrix increases its corrosion resistance by supporting passivation reactions, and do not affect the morphology of L929 fibroblasts. Addition of 5 vol.% the filler does not cause cytotoxic effects, but it supports microgalvanic reactions leading to the greater corrosion rate. Higher content than 5 vol.% the filler causes significant microgalvanic corrosion, as well as increases cytotoxicity due to the greater micro-galvanic effect of the composites containing 10 and 15 vol.% diatoms. The results of contact angle measurements show the hydrophilic character of the investigated materials, with slightly increase in numerical values with addition of amount of ceramic reinforcement. The addition of Didymosphenia geminata frustules causes changes in a thermo-elastic properties such as mean apparent value of coefficient of thermal expansion (CTE) and thermal conductivity (λ). The addition of siliceous reinforcement resulted in a linear decrease of CTE and reduction in thermal conductivity over the entire temperature range. With the increasing addition of Didymosphenia geminata frustules, an increase in strength with a decrease in compressive strain is observed. In all composites an increase in microhardness was attained.
The results clearly indicate that filler in the form of Didymosphenia geminata frustules may significantly change the most important properties of pure Mg, indicating its wide potential in the application of Mg-based composites with a special focus on biomedical use.

Słowa kluczowe:
Metal-matrix composites (MMCs),Pulse plasma sintering (PPS),Ceramic filler,Microstructure,Properties

Afiliacje autorów:
Zgłobicka I. - inna afiliacja
Dobkowska A. - inna afiliacja
Zielińska A. - inna afiliacja
Borucińska E. - inna afiliacja
Kruszewski M. - inna afiliacja
Zybała R. - Politechnika Warszawska (PL)
Płociński T. - Politechnika Warszawska (PL)
Idaszek J. - inna afiliacja
Jaroszewicz J. - inna afiliacja
Paradowski K. - inna afiliacja
Adamczyk-Cieślak B. - inna afiliacja
Nikiforow K. - inna afiliacja
Bucholc B. - IPPT PAN
Święszkowski W. - inna afiliacja
Kurzydłowski K. - inna afiliacja
100p.
2.  Golasiński K.M., Janiszewski J., Sienkiewicz J., Płociński T., Zubko M., Świec P., Pieczyska E.A., Quasi-static and dynamic compressive behavior of Gum Metal: experiment and constitutive model, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-021-06409-z, pp.1-14, 2021

Streszczenie:
The quasi-static and high strain rate compressive behavior of Gum Metal with composition Ti-36Nb-2Ta-3Zr-0.3O (wt pct) has been investigated using an electromechanical testing machine and a split Hopkinson pressure bar, respectively. The stress–strain curves obtained for Gum Metal tested under monotonic and dynamic loadings revealed a strain-softening effect which intensified with increasing strain rate. Moreover, the plastic flow stress was observed to increase for both static and dynamic loading conditions with increasing strain rate. The microstructural characterization of the tested Gum Metal specimens showed particular deformation mechanisms regulating the phenomena of strain hardening and strain softening, namely an adiabatic shear band formed at ~ 45 deg with respect to the loading direction as well as widely spaced deformation bands (kink bands). Dislocations within the channels intersecting with twins may cause strain hardening while recrystallized grains and kink bands with crystal rotation inside the grains may lead to strain softening. A constitutive description of the compressive behavior of Gum Metal was proposed using a modified Johnson–Cook model. Good agreement between the experimental and the numerical data obtained in the work was achieved.

Afiliacje autorów:
Golasiński K.M. - IPPT PAN
Janiszewski J. - Military University of Technology (PL)
Sienkiewicz J. - Military University of Technology (PL)
Płociński T. - Politechnika Warszawska (PL)
Zubko M. - inna afiliacja
Świec P. - inna afiliacja
Pieczyska E.A. - IPPT PAN
200p.
3.  Maj M., Nowak M., Musiał S., Płociński T., Experimental analysis of material, lattice and plastic rotation during deformation of aluminium multicrystal, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2020.139725, Vol.790, pp.139725-1-5, 2020

Streszczenie:
This paper focuses on the experimental determination of the distribution of material, lattice and plastic rotation during deformation of crystalline aggregate. The proposed methodology uses standard electron backscattering diffraction technique combined with 3D digital image correlation data. The presented approach is used for analysis of rotations during deformation of aluminium multicrystal.

Słowa kluczowe:
image analysis, electron backscattering diffraction, plastic deformation, misorientation, plastic rotation

Afiliacje autorów:
Maj M. - IPPT PAN
Nowak M. - IPPT PAN
Musiał S. - IPPT PAN
Płociński T. - Politechnika Warszawska (PL)
140p.
4.  Małolepszy A., Błoński S., Chrzanowska-Giżyńska J., Wojasiński M., Płociński T., Stobiński L., Szymański Z., Fluorescent carbon and graphene oxide nanoparticles synthesized by the laser ablation in liquid, APPLIED PHYSICS A-MATERIALS SCIENCE AND PROCESSING, ISSN: 0947-8396, DOI: 10.1007/s00339-018-1711-5, Vol.124, pp.282-1-7, 2018

Streszczenie:
The results of synthesis of the fluorescent carbon dots (CDots) from graphite target and reduced graphene oxide (rGO) nanoparticles performed by the nanosecond laser ablation in polyethylene glycol 200 (PEG200) are shown. Two-step laser irradiation (first graphite target, next achieved suspension) revealed a very effective production of CDots. However, the ablation in PEG appeared to be effective with 1064 nm laser pulse in contrast to the ablation with 355 nm laser pulse. In the case of rGO nanoparticles similar laser irradiation procedure was less efficient. In both cases, received nanoparticles exhibited strong, broadband photoluminescence with a maximum dependent on the excitation wavelength. The size distribution for obtained CDots was evaluated using the DLS technique and HRTEM images. The results from both methods show quite good agreement in nanoparticle size estimation although the DLS method slightly overestimates nanoparticle's diameter

Afiliacje autorów:
Małolepszy A. - Politechnika Warszawska (PL)
Błoński S. - IPPT PAN
Chrzanowska-Giżyńska J. - IPPT PAN
Wojasiński M. - Politechnika Warszawska (PL)
Płociński T. - Politechnika Warszawska (PL)
Stobiński L. - Politechnika Warszawska (PL)
Szymański Z. - IPPT PAN
30p.

Abstrakty konferencyjne
1.  Maj M., Nowak M., Musiał S., Płociński T., Experimental analysis of material, lattice and plastic rotation during deformation of aluminum multicrystal, ICSMA19, International Conference on Strength of Materials, 2022-06-26/07-01, Metz (FR), pp.1-1, 2022

Słowa kluczowe:
image analysis, plastic deformation, misorientation, plastic rotation

Afiliacje autorów:
Maj M. - IPPT PAN
Nowak M. - IPPT PAN
Musiał S. - IPPT PAN
Płociński T. - Politechnika Warszawska (PL)

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