Search results

1

Structure Studies on Mechanically Alloyed Ni₅₀Ti_{50-x}Moₓ (x=10, 25, 40 at.%) Systems during Milling and after Annealing

100%

Panek J., Karolus M., Piasecki K.

Acta Physica Polonica A

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2016

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vol. 130

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issue 4

1066-1068

EN

The subject of this study is the phase composition evolution of Ni₅₀Ti_{50-x}Moₓ (x=10, 25, 40 at.%) systems prepared by mechanical alloying in as-milled state and after subsequent heat treatment. During milling a mechanically induced solid state reaction between nickel, titanium and molybdenum was observed leading to the formation of nanocrystalline disordered solid solutions. As a result of heat treatment a creation of NiMo intermetallic phase was observed as well as structure relaxation of previously formed solid solutions.

2

Residual Stresses of AlSi10Mg Fabricated by Selective Laser Melting (SLM)

100%

Karolus M., Maszybrocka J., Stwora A., Skrabalak G.

Archives of Metallurgy and Materials

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2019

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vol. 64

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issue 3

3

Structure and Magnetic Properties of Nanocrystalline Fe-Mo Alloys Prepared by Mechanosynthesis

100%

Karolus M., Jartych E., Oleszak D.

Acta Physica Polonica A

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2002

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vol. 102

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issue 2

253-258

EN

Nanocrystalline samples of Fe_{80}Mo_{20} and Fe_{50}Mo_{50} alloys were prepared by the mechanical milling method. The structure, lattice parameters, and crystallite size were determined by the X-ray diffraction. The magnetic properties of the milled products were determined by the M"ossbauer spectroscopy. It was observed that in the case of the Fe_{80}Mo_{20} alloy a solid solution of Mo in Fe was formed with the lattice parameters of Fe increasing from 0.28659 nm to 0.29240 nm and the crystallite size decreasing from 250 nm to 20 nm. In the case of the Fe_{50}Mo_{50} alloy there were no clear changes in values of the lattice parameters of Fe and Mo during the milling process, but the crystallite size decreased from 200 nm to 15 nm. Mössbauer spectra revealed different magnetic phases in the mechanosynthesized Fe-Mo samples. In the case of the Fe_{80}Mo_{20} alloy, the spectrum for the milled mixture indicated the formation of a solid solution. In contrast, for the Fe_{50}Mo_{50} the spectrum indicated the disappearance of the ferromagnetic phase.

4

Structure and Mössbauer Spectroscopy Studies of Multiferroic Mechanically Activated Aurivillius Compounds

88%

Mazurek M., Oleszak D., Pikula T., Karolus M., Jartych E.

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vol. 126

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issue 4

975-978

EN

X-ray diffraction and ^{57}Fe Mössbauer spectroscopy were applied as complementary methods to investigate the structure and hyperfine interactions of the Aurivillius compounds prepared by mechanical activation and subsequent heat treatment. Preliminary milling of precursors enhanced the diffusion process and pure Aurivillius compounds were obtained at lower temperature as compared with conventional solid-state sintering technology (lower at least by 50 K). All the investigated Aurivillius compounds are paramagnetic materials at room temperature.

5

Morphology and surface topography of Ti6Al4V lattice structure fabricated by selective laser sintering

88%

Maszybrocka J., Skrabalak G., Karolus M., Stwora A., Gapiński B.

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2017

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issue 1

6

Structure Properties of AlSi7Mg/SiC Composite Produced by Stir Casting Method

88%

Cyboroń J., Karolus M., Putyra P., Dyzia M., Ratuszek W.

Acta Physica Polonica A

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2016

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vol. 130

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issue 4

969-971

EN

The paper presents the structure studies on composites of aluminum alloy matrix with addition of silicon carbide phase (from 5 to 15 vol.% SiC and 10 vol.% SiC + 10 vol.% graphite) obtained by the stir casting method. The aim of this work is to determine the influence of the SiC content and electrical discharge machining processes on the phase composition, microstructure, and values of residual stresses. In order to determine the heterogeneity of the obtained materials, the X-ray diffraction analysis was performed in different sample orientations to the direction of the X-ray beam (perpendicular and parallel), using different geometries (the Bragg-Brentano and grazing incident X-ray diffraction). This work presents the results of the residual stress analysis in the tested composites generated by various content of SiC additives. Residual stresses were determined by both of the ın²ψ and g-ın²ψ X-ray methods. Obtained results shown the significant gradient of residual stress in all cases.

7

Preparation and Magnetic Characteristics of Co_{1-δ}Zn_{δ}Fe₂O₄ Ferrite Nanopowders

88%

Kubisztal M., Herok I., Karolus M., Prusik K., Haneczok G.

Acta Physica Polonica A

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2017

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vol. 131

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issue 5

1236-1239

EN

In the present paper the Co_{1-δ}Zn_{δ}Fe₂O₄ (0 ≤ δ ≤ 1) ferrite nanopowders with a spinel type structure were synthesized using a chemical co-precipitation technique with constant flow rate ν _{FR}=120 cm³/min at three different reaction temperatures i.e. T_r =50°C, 70°C and 90°C. Magnetic and structural characteristics of the obtained materials were investigated by means of X-ray diffraction method, transmission electron microscopy and vibrating sample magnetometer. In the course of studies hysteresis loops M(μ₀H) and the relations of magnetization M_{7T} (determined at μ_0H=7 T), squareness ratio S and the Néel temperature T_{N} versus Zn content were determined and discussed in detail. It was shown that for δ<0.6 the increase in reaction temperature T_r results in a significant increase of the measured magnetic characteristics. In particular, in the case of Co_{0.8}Zn_{0.2}Fe₂O₄ ferrite nanopowder magnetization M_{7T} reaches maximal value of about 80 emu/g.

8

Structural Characterization and Magnetic Properties of CuCr₂Te₄ Spinel Obtained by Mechanical Alloying and Heat Treatment

88%

Karolus M., Maciążek E., Panek J., Kubisztal M., Groń T.

Acta Physica Polonica A

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2016

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vol. 130

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issue 4

859-861

EN

CuCr₂Te₄ can be obtain by mechanical alloying followed by heat treatment. The obtained phase crystallizes in the spinel-type structure of the space group Fd3m. The calculated crystallite size equals to 100 nm. Magnetic susceptibility measurements showed ferrimagnetic order below 21 K.

9

Synthesis and Magnetic Properties of CuCr_{1.65}Se_4 Nanoparticles

76%

Maciążek E., Panek J., Kubisztal M., Karolus M., Groń T., Duda H.

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vol. 126

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issue 5

1137-1139

EN

CuCr_{1.65}Se_{4} nanoparticles crystallize in the monoclinic Cr_{2}Se_{3}-type structure of the space group I2/m. The average crystallite size basing on the line broadening is less than 10 nm. With decrease of the size of grains a change from ferromagnetic to ferrimagnetic order, a lack of the magnetization saturation and a strong spin-orbit coupling visible in the large value of the Landé factor g_{χ} = 2.72 are observed. The change in magnetic order is caused by the change of the crystalline symmetry from the cubic phase to monoclinic one.

Refine search results

Structure Studies on Mechanically Alloyed Ni₅₀Ti_{50-x}Moₓ (x=10, 25, 40 at.%) Systems during Milling and after Annealing

Residual Stresses of AlSi10Mg Fabricated by Selective Laser Melting (SLM)

Structure and Magnetic Properties of Nanocrystalline Fe-Mo Alloys Prepared by Mechanosynthesis

Structure and Mössbauer Spectroscopy Studies of Multiferroic Mechanically Activated Aurivillius Compounds

Morphology and surface topography of Ti6Al4V lattice structure fabricated by selective laser sintering

Structure Properties of AlSi7Mg/SiC Composite Produced by Stir Casting Method

Preparation and Magnetic Characteristics of Co_{1-δ}Zn_{δ}Fe₂O₄ Ferrite Nanopowders

Structural Characterization and Magnetic Properties of CuCr₂Te₄ Spinel Obtained by Mechanical Alloying and Heat Treatment

Synthesis and Magnetic Properties of CuCr_{1.65}Se_4 Nanoparticles