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Influence of annealing conditions on changes of the structure and selected properties of Al88Y7Fe5 and Al88Y6Fe6 alloys

Babilas Rafał, Spilka Monika, Łoński Wojciech, Radoń Adrian, Kądziołka-Gaweł Mariola, Gębara Piotr

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 2

art. no. e144614

EN

Al-Y-Fe amorphous and nanocrystalline alloys are characterized by a unique collection of diverse properties that are influenced by various factors, including heat treatment. In this paper, the effect of heat treatment on the structural changes and selected properties of Al-Y-Fe metallic glasses in the as-spun state is investigated. The structure of the Al88Y7Fe5 and Al88Y6Fe6 alloys was examined by X-ray diffraction (XRD) and Mössbauer spectroscopy (MS). The corrosion resistance of the samples was characterized using polarization tests in a 3.5% NaCl solution at 25 °C. The effect of sodium chloride on the surface was studied with scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The magnetic properties of Al-based alloys were explored using a vibrating sample magnetometer (VSM). It was revealed that the tested alloys show better properties after annealing than in the as-spun state. The annealing of the Al88Y7Fe5 and Al88Y6Fe6 alloys in the temperature range of 200 to 300 °C improved the magnetic properties and corrosion resistance of these materials. After 3,600 s, the better EOCP values were recorded for the Al88Y6Fe6 and Al88Y7Fe5 alloys after annealing at 300 °C and 200 °C, adequately. On the basis of the polarization tests, it was concluded that the electrochemical properties are better for Al88Y6Fe6 alloys after annealing at 300 °C.

2

Electrochemical behavior and morphology of selected sintered samples of Mg65Zn30Ca4Pr1 alloy

Hrapkowicz Bartłomiej, Lesz Sabina, Drygała Aleksandra, Karolus Małgorzata, Gołombek Klaudiusz, Babilas Rafał, Popis Julia, Gabryś Adrian, Młynarek-Żak Katarzyna, Garbiec Dariusz

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 3

art. no. e145564

EN

In order to investigate the effect of the milling time on the corrosion resistance of the Mg65Zn30Ca4Pr1 alloy, powders of the alloy were prepared and milled for 13, 20, and 70 hours, respectively. The samples were sintered using spark plasma sintering (SPS) technology at 350◦C and pressure of 50 MPa. The samples were subjected to potentiodynamic immersion tests in Ringer’s solution at 37◦C. The obtained values of Ecorr were –1.36, –1.35, and –1.39 V, with polarization resistance Rp = 144, 189, and 101 Ω for samples milled for 13, 20 and 70 h, respectively. The samples morphology showed cracks and pits, thus signaling pitting corrosion.

3

Photocatalytic decolourization of rhodamine b by modified photo-Fenton process with quasicrystals - preliminary research

Łoński Sylwester, Łoński Wojciech, Babilas Rafał, Barbusiński Krzysztof

Architecture Civil Engineering Environment

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2023

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Vol. 16, no. 2

171--176

EN

A novel photocatalytic process using a modification of photo-Fenton reaction, with sodium percarbonate (SP), as an alternative source of H2O2, and alloy Al65Cu20Fe15 containing, among others, quasicrystals (of the percentage composition Al65Cu20Fe15), being a source of iron ions, effectively decolourizes the aqueous solution of rhodamine B (RB; solution of 5 mg/l). The source of UV radiation was a lamp with a power of 36 W. The experiments were carried out at pH = 7 and reaction time (from 5 to 60 min). The increase in SP concentration (in the range of 8.3 to 33.3 g/l) significantly increased the degree of degradation of RB and the reaction rate. However, the use of quasicrystals, in the range of 8.3 to 33.3 g/l, was also important in the modified photocatalytic photo-Fenton process. The best degradation effects of RB (95%) were obtained for the highest SP concentration of 33.3 g/l and the lowest quasicrystal concentration of 8.3 g/l. On the other hand, visual decolourization of RB was obtained with an efficiency of 70% for SP and quasicrystal concentrations of 16.7 g/l and 16.7 g/l, respectively, after 45 minutes, and for SP and quasicrystal concentrations of 33.3 g/l and 8.3 g/l, respectively, after the time of 20 minutes. The best RB degradation effects in the comparative method (UV/Na2CO3·1.5H2O2 without the addition of quasicrystals) were only 52.7%. The obtained results encourage further research to optimize the conditions of the proposed method and to investigate its applicability to other types of dyes and pollutants.

4

Influence of Fe, Cr, and Cu addition on the microstructure, hardness, and anticorrosion properties of Al-Ni-Y alloys

Babilas Rafał, Młynarek-Żak K., Łoński W., Bukowiec D., Lis M., Kądziołka-Gaweł M., Warski T., Radoń A.

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 2

art. no. e82, 1--15

EN

This study evaluated the structural changes of Al-Ni-(Fe,Cr,Cu)-Y alloys induced by different cooling states. The aim was to determine the role of Fe, Cr, and Cu addition as well as cooling rate on the structure, hardness and anticorrosion properties of crystalline and nanocrystalline Al-Ni-Y alloys. The impact of the preparation method on the structure of alloys was observed by the broadening of the X-ray diffraction peaks of the alloys in the form of plates, which indicated structure fragmentation at a high cooling rate. The TEM images showed the formation of a structure composed of homogeneously dispersed α-Al nanograins. Phase analysis performed using X-ray diffraction method and Mossbauer spectroscopy revealed that the slowly cooled master alloys were mainly composed of Al23Ni6Y4, Al10Fe2Y, and α-Al phases. The Al10Fe2Y structure was the main Fe-bearing phase in all investigated master alloys. A crystallization mechanism was proposed based on the DTA heating and cooling curves. The pitting corrosion type was identified based on morphology observations after electrochemical tests. Rapid solidification and the addition of chromium and copper improved the microhardness as well as corrosion resistance. The high increase of hardness (289 HV0.1) and corrosion resistance[...]

5

Metoda melt-spinning w wytwarzaniu amorficznych stopów aluminium

Młynarek-Żak Katarzyna, Lis Mateusz, Babilas Rafał

LAB Laboratoria, Aparatura, Badania

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2021

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R. 26, nr 4

38--40

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Zastosowanie rentgenowskiej spektroskopii fotoelektronów do analizy produktów korozji stopów wapnia

Młynarek Katarzyna, Szyba Dawid, Babilas Rafał, Bajorek Anna

LAB Laboratoria, Aparatura, Badania

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2020

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R. 25, nr 2

30--32, 41

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Mechanical and corrosion properties of Mg68-xZn28+xCa4 (x=0,2,4) metallic glasses

Nowosielski Ryszard, Cesarz-Andraczke Katarzyna, Babilas Rafał

Ochrona przed Korozją

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2019

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nr 6

192--196

EN

Metallic amorphous alloys, which consisted of the biocompatible elements such as Ca, Mg and Zn, can be used as potential resorbable materials for short term orthopedic implants [1,2]. The concept of resorbable metallic implants is based on combination of two factors: good bearing capacity, sufficiently high mechanical strength and stable implants geometry, invariable during concrescence of bone, and controllable corrosion rate (dissolution rate). Therefore, the following criteria on Mg-based metallic glass for resorbable implant were chosen: Rc > 160 MPa [3], H2 ≤ 1ml/h [4] and Vcorr ≈ 0.01 - 0.1 mm/year [5]. The glass-forming ability (GFA), volume of evolved hydrogen, corrosion rate, compression strength and hardness of Mg68-xZn28+xCa4 (x=0,2,4) metallic glasses were examined. Results of corrosion studies and mechanical properties tests were compared with assumed criteria. Results of corrosion tests showed that the corrosion rate (Vcorr) and the volume of released hydrogen decreased with the increase zinc concentration in the tested alloys. For the Mg66Zn30Ca4 amorphous alloy with a diameter of 2 mm, the highest hardness about 300 HV and the compressive strength about 400 MPa were determined.

PL

Stopy metali o strukturze amorficznej, które składają się z biokompatybilnych pierwiastków, takich jak Ca, Mg i Zn mogą być rozpatrywane jako potencjalnie resorbowalne biomateriały do krótkotrwałych implantów ortopedycznych [1,2]. Koncepcja resorbowalnych implantówmetalicznych opiera się na połączeniu dwóch czynników: dobrej nośności, odpowiedniej wytrzymałości mechanicznej i stabilnej geometrii implantów, niezmiennej w trakcie wzrostu kości i kontrolowanej szybkości korozji (szybkości roztwarzania). W związku z tym wybrano następujące kryteria dla szkła metalicznego na osnowie magnezu, rozpatrywanego jako materiał na resorbowalny implant: Rc> 160 MPa [3], H2 ≤ 1 ml/h [4] i Vcorr ≈ 0,01 - 0,1 mm/rok [5]. W ramach tej pracy zbadano zdolność do zeszklenie (GFA), objętość wydzielonego wodoru podczas zanurzenia w roztworze Ringer’a, szybkość korozji, wytrzymałość na ściskanie i twardość szkieł metalicznych Mg68-xZn28+xCa4 (x = 0,2,4). Wyniki badań korozyjnych i właściwości mechanicznych zostały porównane z założonymi kryteriami. Wyniki badań korozyjnych wykazały, że szybkość korozji (Vcorr) i objętość uwolnionego wodoru zmniejszyły się wraz ze zwiększeniem stężenia cynku w badanych stopach. Dla amorficznego stopu Mg66Zn30Ca4 o średnicy 2 mm wyznaczono najwyższą twardość około 300 HV i wytrzymałość na ściskanie około 400 MPa.

8

Wybrane metody badań cienkich warstw ceramicznych na stopach magnezu

Kania Aneta, Cesarz-Andraczke Katarzyna, Szyba Dawid, Babilas Rafał

LAB Laboratoria, Aparatura, Badania

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2019

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R. 24, nr 3

12--17

9

Corrosion properties of Mg-Zn-Ca-(Cu, Au) metallic glasses in artificial physiological fluid

Cesarz-Andraczke Katarzyna, Nowosielski Ryszard, Babilas Rafał

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 3

716--723

EN

The Mg-Zn-Ca-(Cu,Au) alloys were considered as resorbable materials for orthopedic short- term implants. The aim of this paper was to determine the influence of Au and Cu addition on corrosion properties of Mg69Zn25Ca5Au1, Mg69Zn25Ca5Au0.5Cu0.5 and Mg69Zn25Ca5Cu1 metallic glasses. The analysis of corrosion results allowed to describe the influence of 0.5 and 1 at.% of Au and Cu on the corrosion resistance in artificial physiological fluid. The Mg69Zn25Ca5Au0.5Cu0.5 and Mg69Zn25Ca5Cu1 metallic glasses exhibit lower corrosion resis-tance in comparison with Mg69Zn25Ca5Au1 alloy. The increase of Cu content caused the increase of hydrogen evolution volume and the high cathodic activity. The Mg69Zn25Ca5Au1 metallic glass shows the decrease of hydrogen evolution volume and manifests the low corrosion current density and the high polarization resistance, indicating the high corrosion resistance.