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1
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Mössbauer Study on Local Atomic Structure in Fe_{80-x}Nb_xB_{20} (x=4, 6) Metallic Glasses

100%
Babilas R., Kądziołka-Gaweł M.
Acta Physica Polonica A
|
2016
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vol. 129
|
issue 2
190-192
EN
Fe-based amorphous alloys were prepared by the melt-spinning technique and characterized by X-ray diffraction and transmission Mössbauer spectroscopy. The studies were performed on Fe₇₆Nb₄B₂₀ and Fe₇₄Nb₆B₂₀ metallic glasses in the form of ribbons. The Mössbauer spectroscopy allows to study the local environments of the Fe atoms in the glassy state, showing the changes in the amorphous structure due to the changing of Nb addition. The obtained Mössbauer spectra of ferromagnetic metallic glasses present broad lines resulting from the distribution of non-equivalent iron sites and of interatomic distances. Variation of Nb content in the alloys affects the disorder in as-cast state and also influences on the average radius of the first coordination shell and the number of nearest neighbor Fe atoms.
2
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Structural Study and Crystallization Behaviour of Fe_{62-x}CoₓNb₈B₃₀ Metallic Glasses (x=0, 20)

100%
Babilas R., Kądziołka-Gaweł M.
Acta Physica Polonica A
|
2016
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vol. 130
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issue 4
901-904
EN
The paper presents the structural analysis of Fe_{62-x}CoₓNb₈B₃₀ metallic glasses (x=0, 20) in as-cast and after crystallization state. The studies were performed on metallic glasses of ribbon form: with thickness of 0.05 and 0.06 mm. The structure analysis of the samples in as-cast state and phase analysis of studied alloys after annealing was carried out by the X-ray diffraction methods. Moreover, the Mössbauer spectroscopy was also used to investigate the local structure for examined alloys. The soft magnetic properties examination covered the initial magnetic permeability. The after-effects of magnetic permeability were also conducted.
3
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The Influence of Nb Atoms on the Crystallization Process of Fe-B-Nb Amorphous Alloys

100%
Babilas R., Kądziołka-Gaweł M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
573-575
EN
The ferromagnetic Fe-based amorphous alloys have been studied due to the attractive properties for soft magnetic applications. Depending on different Nb concentration, we studied the formation of crystalline phases in annealed samples of amorphous metallic alloys for Fe_{80-x}B₂₀Nbₓ (x=0, 4, 10). The nature of the crystallization products as well as the phase structure were determined by using the Mössbauer spectrometry combined with X-ray diffraction and differential scanning calorimetry results. Substitution of Fe atoms by Nb lead to significant changes in hyperfine magnetic field (B_{hf}) distributions in as-quenched amorphous alloys Fe_{80-x}B₂₀Nbₓ, for x=10 the minimal value of B_{hf} is observed. Addition of this element causes shift of crystallization process towards higher temperatures and induces formation of phase complex including the α -Fe, Fe₂B and Fe₃B. Combination of X-ray diffraction and Mössbauer spectroscopy is very useful method in studying the structural environment of Fe atoms on a nearest-neighbor length scale.
4
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Structural Characterization of Rapidly Solidified Al71Ni24Fe5 Alloy

85%
Młynarek K., Czeppe T., Babilas R., Młynarek K., Czeppe T., Babilas R.
Archives of Foundry Engineering
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2021
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issue 3
5
Content available remote

Structure and Chosen Nanomechanical Properties of Amorphous-Crystalline Laser Weld

81%
Pilarczyk W., Kania A., Babilas R., Pilarczyk A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 2
219-221
EN
Zr-based bulk metallic glasses attract the attention because of their good mechanical properties and glass-forming ability. A laser welding process has been applied to increase the capability of using amorphous materials in the industry. The plates of Zr₅₅Al₁₀Ni₅Cu₃₀ alloy were produced by die pressure casting method and welded by the TruLaser Station 5004. X-ray analysis and microscopic observation provided information about the structure and morphology of the cross-section of weld on the boundary of the heat affected zone and the fusion zone. Nanohardness and reduced Young modulus of the particular heat affected zone, fusion zone, and parent material were examined with Hysitron TI950 Triboindenter and with the Berkovich indenter. The presence of the amorphous and amorphous-crystalline phases was confirmed by related tests. The detailed topographic analysis revealed that the heat affected zone demonstrated a slight roughness characteristic of the crystalline phase and a smooth surface in the fusion zone. The main value of the nanohardness of particular weld zones has the similar order of magnitude. In turn, Er value is restricted in the range of 105.76-108.80 GPa. The main goal of this work is to present the structure and chosen nanomechanical properties of the Zr₅₅Cu₃₀Ni₅Al₁₀ laser weld.
6
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Selected Properties of ZnO Coating on Mg-Based Alloy for Biomedical Application

81%
Kania A., Pilarczyk W., Babilas R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 2
222-224
EN
Magnesium and its alloys are interesting materials for biodegradable implant applications. Magnesium alloys have very good strength properties, they are lightweight, but their main disadvantage is a low corrosion resistance in the physiological environment. Various modifications of a Mg alloys surface by deposition of different coatings are used to prevent untimely dissolution. The article presents the investigation results of a thin ZnO coating deposited on a MgCa2Zn1Gd3 alloy by means of the magnetron sputtering method. The studies include: scanning electron microscope observation of the ZnO surface, X-ray phase analysis, surface roughness measurement in atomic force microscopy, the microhardness test and potentiodynamic corrosion resistance test in the Ringer solution at 37°C. It was found that the ZnO coating is compact and continuous. It increases the hardness of the MgCa2Zn1Gd3 alloy and also improves its corrosion resistance. The corrosion potential is shifted slightly towards the positive values from -1.52 V to -1.50 V for the alloy with the ZnO coating.
7
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Structure and Properties of Mg-Cu-(Y,Ca) Bulk Metallic Glasses / Struktura I Własności Masywnych Szkieł Metalicznych Mg-Cu-(Y,Ca)

81%
Babilas R., Cesarz-Andraczke K., Nowosielski R.
Archives of Metallurgy and Materials
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2015
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issue 4
8
Content available remote

Structure and Magnetic Properties of Fe-B-Si-Zr Metallic Glasses

81%
Babilas R., Radoń A., Gębara P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
726-728
EN
Fe-based amorphous alloys were characterized by X-ray diffraction, transmission Mössbauer spectroscopy and vibrating sample magnetometry. The studies were performed on (Fe_{0.75}B_{0.15}Si_{0.1})_{100-x}Zr_{x} (x=0, 1, 3) metallic glasses in the form of ribbons. The glassy samples were prepared by the "melt spinning" technique in argon protective atmosphere. The XRD patterns show the broad diffraction halo that is typical for amorphous Fe-based alloys. The Mössbauer spectroscopy allows to study the local environments of the Fe atoms in the glassy state, showing the changes in the amorphous structure due to the changing of Zr addition. From hysteresis loops obtained from vibrating sample magnetometry measurements, coercive force and saturation magnetization were determined versus different Zr content. The obtained magnetic properties allow to classify the studied amorphous alloys in as-cast state as soft magnetic materials.
9
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The Influence of Technological Parameters of the Casting Process on the Structure and Selected Properties of Iron-Based Metallic Glasses

81%
Pilarczyk W., Jung T., Babilas R.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
923-926
EN
The main aim of this paper was to produce amorphous ribbons with specified composition with the use of various process parameters and X-ray qualitative and quantitative phase analysis after casting and heat treating. Station for ultra-fast cooling of the molten alloy with high vacuum pumps designed for the production of metallic glasses in the form: of ribbons with the use of Bühler Melt Spinner SC was used. The X-ray qualitative and quantitative phase analysis, microscopic observation, microhardness and thermal properties tests of the investigated ribbons were conducted. Based on experimental data the discussion on the correlation between casting process parameters, phase and quantitative composition and heat treatment was carried out.
10
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Mössbauer Study of Some Intermetallic Compounds Fe_{80-x}Ni_{x}B₂₀ (x=8, 16, 24, 28)

81%
Kądziołka-Gaweł M., Babilas R., Granek K.
|
EN
Fe-based nanocrystalline alloys were prepared by the melt-spinning technique and characterized by X-ray diffraction, magnetostatic and Mössbauer effect methods. The Mössbauer spectroscopy allows to study the local environment of the Fe atoms in the investigated Fe_{80-x}Ni_{x}B₂₀ (x=8, 16, 24, 28) compounds and showing the changes in the structure due to the changing of Ni addition. Combination of X-ray diffraction and Mössbauer spectroscopy results confirm formation of different number of phase complex, including the α-FeNi, γ-FeNi, FeB, Fe₂B, Fe₃B in the investigated materials together with increase of Ni content.
11
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Fabrication of Multilayer Cu/Ni Systems with Nanometric Layers by Electrolysis Method

71%
Spilka M., Babilas R., Ratuszek W., Kowalska J., Matus K.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 4
12
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Corrosion Properties of Ca65–xMg17.5Zn17.5+x (x = 0, 2.5, 5) Alloys

71%
Babilas R., Wojciechowski P., Bajorek A., Sakiewicz P., Cesarz-Andraczke K.
Archives of Metallurgy and Materials
|
2019
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vol. 64
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issue 3
13
Content available remote

Electrochemical Characterization of Ca₆₅Mg₁₅Zn₂₀ Amorphous Alloy in Selected Physiological Fluids

71%
Babilas R., Szyba D., Kania A., Pilarczyk W., Nowosielski R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 2
228-231
EN
The corrosion behavior of the bulk glassy samples of Ca₆₅Mg₁₅Zn₂₀ alloy was studied by electrochemical measurements and immersion tests in a simulated body fluid, physiological fluid, and the Ringer solution. The results of immersion show that the volume of H₂ evolved after 2 h in simulated body fluid (29.8 ml/cm²) is the highest in comparison with the results of measurements conducted in physiological fluid (11.3 ml/cm²) and the Ringer solution (7.4 ml/cm²). The electrochemical measurements indicated a shift of the corrosion potential (E_{corr}) from -1.58 V for plate tested in a physiological fluid to -1.56 V and -1.54 V for samples immersed in the Ringer solution and simulated body fluid, adequately. The X-ray diffraction measurements were used to determine composition of corrosion products. The corrosion products were mainly identified to be calcium carbonates and calcium/magnesium hydroxides.
14
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Magnetic Properties and Structure after Crystallization of Fe_{80-x}B_{20}Nb_{x} (x=4, 6, 10) Metallic Glasses

71%
Nowosielski R., Kądziołka-Gaweł M., Gębara P., Szyba D., Babilas R.
Acta Physica Polonica A
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2017
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vol. 131
|
issue 5
1212-1216
EN
The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications. Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous Fe_{80-x}B₂₀Nb_{x} (x = 4,6,10) alloys was studied. The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements. The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization. It was found that Nb addition changed the crystallization process from single crystallization for Fe₇₆B₂₀Nb₄ alloy to binary crystallization in the Fe₇₄B₂₀Nb₆ and Fe₇₀B₂₀Nb₁₀ glasses. The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe₃B, and Fe₂B phases for alloys x=4, 6.
15
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Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses

62%
Babilas R., Cesarz-Andraczke K., Nowosielski R., Sakiewicz P., Maciej A., Jakóbik-Kolon A.
Archives of Metallurgy and Materials
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2016
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issue 2
16
Content available remote

Structural Studies with the Use of XRD and Mössbauer Spectroscopy οf Bi_5Ti_3FeO_{15} Ceramic Powders Obtained by Mechanical Synthesis

62%
Dercz G., Rymarczyk J., Hanc A., Prusik K., Babilas R., Pająk L., Ilczuk J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1623-1629
EN
In this paper the structural and Mössbauer spectral properties of multiferroic ceramic Bi_5Ti_3FeO_{15} powders prepared by high-energy ball milling of polycrystalline precursor material (mixture of Bi_2O_3, TiO_2 and Fe_2O_3 powders) are presented. Mechanical synthesis was performed by high-energy vibratory mill. The X-ray diffraction methods were applied for the structure characterization of the studied samples. The parameters of diffraction line profiles were determined by PRO-FIT Toraya procedure. The crystallite sizes and lattice distortions were analyzed using the Williamson-Hall method. Investigations of hyperfine interactions in the studied materials were carried out by the Mössbauer spectroscopy. The powder morphology was analyzed by scanning electron microscopy and transmission electron microscopy techniques. It was found that during high-energy milling phase transitions, a decrease in crystallite size and amorphization process are observed.
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