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Wyświetlanie 1-15 z 21
Tytuł:
Investigation of Data Mining Processing Stage Effect on Performance in Interferometric Measurement System
Autorzy:
Böcekçi, V.
Yıldız, K.
Powiązania:
https://bibliotekanauki.pl/articles/1033378.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Kf
81.05.Bx
06.30.Bp
Opis:
Interferometric measuring systems are frequently used in determining the precise changes. The light of the venture property is used in this system which is possible to perform measurements in the nanometer precision. Analysis of data, which are taken from interferometric measurement systems, can be performed by fringe counting, image processing. There are disadvantages of such kinds of methods which are cost, time and design challenge. The most innovation in our study, the need of electronic circuit or image processing algorithm for determining obtained values which are taken from measurement system as a result of processing part can be eliminated. In processing step, arrangement of the data is quite important in terms of the achieved results. Through data processing, it is provided to make faster analysis by the aid of increasing quantity of the data. The displacement values which are taken by data processing show 90% success when comparing them with both electronic and image processing techniques.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 46-47
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic properties and structure of the Ni-Co-Mn-In alloys with the boron addition
Autorzy:
Prusik, K.
Matyja, E.
Kubisztal, M.
Zubko, M.
Swadźba, R.
Powiązania:
https://bibliotekanauki.pl/articles/1055090.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.Kf
87.64.Ee
75.50.Ee
75.50.Gg
71.20.Be
Opis:
Series of Ni_{45.5-x}Co_{4.5}Mn_{36.6}In_{13.4}B_{x} (at.%, x=0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys were examined in terms of the magnetic properties, structure and transition temperatures. Depending on the boron concentration single or two phase alloys microstructures were observed. Additionally, the martensitic transformation temperatures decreases with the boron addition. Magnetic-field induced transformation occurs for the alloys with the boron addition up to 0.1 at.%. For alloys with 0.5 and 1.0 at.% of B transformation is hindered.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1240-1243
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin disordered resistivity of the Heusler Ni₂MnGa-based alloys
Autorzy:
Kamarád, J.
Kaštil, J.
Albertini, F.
Fabbrici, S.
Arnold, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1053068.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Cc
81.30.Kf
72.15.Eb
75.47.De
Opis:
Electrical resistivity of the selected Heusler off-stoichiometric (NiCo)₂Mn(GaIn) alloys was studied in a wide range of temperature and magnetic field. A step-like change of resistivity (Δρ ≈24 μΩcm) was detected in the off-stoichiometric Ni_{1.85}Mn_{1.21}Ga_{0.94} alloy at temperature of martensitic structural transition. This Δρ is much more significant than one in the stoichiometric Ni₂MnGa alloy. In the case of the off-stoichiometric (NiCo)₂Mn(GaIn) alloys, an enormous change of resistivity, Δρ ≈ 200 μΩcm, accompanies the structural transition. Simultaneously, the maximum of the spin disordered resistivity ρ_{sd}(T) of austenite phase of the alloys is slightly dependent on composition of the alloy and vary from ≈30 μΩcm up to ≈45 μΩcm, in good agreement with theoretical calculations. Due to high sensitivity of the structural transition temperature of the alloys to magnetic field, the very pronounced magnetoresistance effects have been observed in the studied alloys.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1072-1074
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of deformation on the transformation temperatures of martensite and bainite structures in Cu-9.97%Al-4.62%Mn alloy
Autorzy:
Aldirmaz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1075528.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
68.37.Hk
81.30.Kf
81.30.Mh
62.20.-x
65.40.-b
Opis:
At present study of Cu-9.97%Al-4.62%Mn alloy system is used. Some physical properties of martensitic and bainite phase transformatios in Cu-9.97%Al-4.62%Mn (wt%) alloy were investigated by means of scanning electron microscopy and differential scanning calorimetry. In scanning electron microscope observations of Cu-9.97%Al-4.62%Mn alloy were noted two kinds of martensitic phases. These phases were defined as β'₁ (M18R) and γ'₁ (2H) martensites structures. According to differential scanning calorimetry measurement results, the deformation induced temperature is expected to be higher than the thermally induced temperature in Cu-9.97%Al-4.62%Mn alloy for martensite and bainite structures.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 40-42
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Fe addition on the martensitic transformation, structure and magnetic properties of metamagnetic Ni-Co-Mn-Sn alloys
Autorzy:
Wójcik, A.
Maziarz, W.
Szczerba, M.
Sikora, M.
Hawełek, Ł.
Czaja, P.
Powiązania:
https://bibliotekanauki.pl/articles/1154400.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
81.30.Kf
Opis:
In this study the effect of Fe for Ni substitution in Ni₄₄Co₆Mn₃₉Sn₁₁ metamagnetic shape memory alloys on their structure, magneto-structural transformation characteristics, magnetic and magnetocaloric properties was studied. The results show that the structure and martensite transformation behavior strongly depends on the Fe concentration. The martensitic transformation temperature decreases with 1 at.% of Fe and is suppressed with higher Fe content. It was further found that substitution of Fe for Ni leads to lowering of the value of magnetic entropy change.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1026-1028
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and properties of NiTi shape memory alloy after cold rolling in martensitic state
Autorzy:
Świec, P.
Zubko, M.
Lekston, Z.
Stróż, D.
Powiązania:
https://bibliotekanauki.pl/articles/1113263.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.Kf
81.40.Ef
62.20.fg
Opis:
Due to unique features, like shape memory effects and superelasticity, NiTi alloys with nearly equiatomic composition are used in various branches of industry. Application of severe plastic deformation can drastically change properties of the materials. In the present paper the Ni_{50.4}Ti_{49.6} alloy after cold rolling in the martensitic state and further annealed is studied. Phase transformations were studied using X-ray diffraction and differential scanning calorimetry measurements. Microstructure was examined using transmission electron microscopy and electron backscattering diffraction methods. Mechanical properties of obtained alloys has been studied using Vickers microhardness tests. Based on the performed measurements it can be seen that in studied alloys two steps B2 ↔ R ↔ B19' phase transitions occurred. Performed plastic deformation influences course of phase transitions and phases composition. Due to the reduction of grain size microhardness of the studied material is increasing with increase of deformation degree.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1081-1084
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of chitosan-ZnO layers electrophoretically deposited on NiTi shape memory alloy
Autorzy:
Goryczka, T.
Kokoszka, A.
Kowalski, P.
Łosiewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1112222.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Nz
61.66.Dk
68.37.Hk
81.30.Kf
87.68.+z
Opis:
The surface of NiTi shape memory was modified by deposition of chitosan-ZnO thin film. The electrodeposition process was carried out at room temperature at voltage-time conditions: 10 V/30 s, 10 V/300 s, 20 V/30 s, or 20 V/300 s. Structure of the obtained coatings was studied by means of grazing incidence beam X-ray diffraction. Distribution of the zinc oxide particles in the chitosan matrix was observed with use of scanning electron microscopy. It was found that depending on the electrodeposition parameters, the structure of the obtained chitosan-ZnO coatings varies from amorphous to coarse-grained.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1056-1058
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of the Extruded and Thermally Treated $Ni_{54.3}Fe_{16.2}Ga_{29.5}$ Alloy
Autorzy:
Prusik, K.
Matyja, E.
Zubko, M.
Goryczka, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398368.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.Kf
87.64.Ee
81.30.Mh
83.85.Hf
71.20.Lp
71.20.Be
Opis:
Hot extrusion process was applied to $Ni_{54.3}Fe_{16.2}Ga_{29.5}$ polycrystalline alloy. Then the rod was annealed subsequently for 1 h at 700, 800, 900, and 1100°C. In this paper the effect of annealing on the microstructure of the polycrystalline extruded Ni-Fe-Ga alloy were analyzed. The structure of the alloys was determined by the X-ray and transmission electron microscopy. The electron backscattering diffraction technique was applied to obtain the texture of the extruded rods after heat treatment.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1020-1022
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of laboratory X-ray micro-diffraction to study the effects of clinching process in steel sheets
Autorzy:
Krztoń, H.
Mucha, J.
Witkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1058098.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
81.30.Kf
81.70.Bt
81.20.Vj
Opis:
The application of X-ray micro-diffraction to study the local changes in austenite content in clinching joints made of DP 600 steel is presented. The relations between various parameters of the cold pressing process and the microstructure and the austenite content in the individual parts of the clinching joints are shown.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 985-987
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray diffraction studies of the reversible phase transformation in NiTi shape memory alloy
Autorzy:
Lekston, Z.
Zubko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075673.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
81.30.Kf
61.05.cp
Opis:
In the present paper the phase transformations occurring in hot worked and heat-treated Ni-rich NiTi shape memory alloy were studied using X-ray diffraction, differential scanning calorimetry and bend and free recovery measurements. Based on conducted measurements it can be seen that in the studied alloy two-step B2 ↔ R ↔ B19' phase transitions occurred. Due to the fact that during heating the phase transition B2 → R and R → B19' occurs in a very narrow temperature range and differential scanning calorimetry peaks overlap additional X-ray diffraction measurements were performed. Obtained characteristic temperatures from applied different experimental methods are in good agreement. The optimum heat-treatment was selected to obtain rods with a shape recovery temperature A_{f} below 37°C to prepare prototypes of medical implants activated by patients body heat.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1059-1062
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermo-Mechanical Properties of an NiTi-Shape Memory Alloy after Dynamic Loading
Autorzy:
Grigorieva, V.
Danilov, A.
Razov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402089.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
81.30.Kf
81.70.Bt
Opis:
The results of the comparative study of a quasi-equilibrium NiTi alloy's thermo-mechanical response to high-rate and quasi-static straining in the temperature range of 100-300°C, which included the $A_{f}$ and the $M_{d}$ temperatures, are considered. The existence of B2 → B19' and B2 → R → B19' martensitic transformations, associated with the heterogeneous distribution of Ni₄Ti₃ precipitates is shown to result in shaping of martensitic and austenitic two-way shape memories, the simultaneous presence of which determines the reversing shape memory effect. The suppression of stress-induced B2 → B19' transformation at temperatures higher than the $M_{d}$ temperature resulted in austenitic two-way shape memory only. Distinct dependences on the temperature of the critical stresses that initiate B2 → B19' and B2 → R → B19' martensitic transformations in austenite are shown to be the reason for the participation of the irreversible mechanisms of straining at the earliest stages of tension, whatever the strain-rate applied, thus annihilating the distinctions between the quasi-static and high-rate straining processes. As a result, the thermo-mechanical properties acquired after tension become practically independent of the strain-rate.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 592-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Step Martensitic Transformation in an Aged $Ti_{50}Ni_{15}Pd_{25}Cu_{10}$ High Temperature Shape Memory Alloys
Autorzy:
Rehman, S.
Khan, M.
Nusair Khan, A.
Ali, L.
Imran Jaffery, S.
Powiązania:
https://bibliotekanauki.pl/articles/1401938.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.Kf
Opis:
Multi-step martensitic transformation in an aged Ni-rich binary NiTi shape memory alloy is considered as usual behavior during transformation from austenite to martensite phase; from (austenite) B2 to R-phase and then R-phase to B19' (monoclinic). However, for equi-atomic NiTi-based quaternary high temperature shape memory alloy, two-step martensitic transformation was detected for the first time. The $Ti_{50}Ni_{15}Pd_{25}Cu_{10}$ high temperature shape memory alloys were investigated for the evolution of transformation temperatures at aging temperature of 550°C and 700°C. Aging at 550°C for 6 h resulted in significant reduction of phase transformation temperatures. During forward transformation from austenite to martensite, two-step martensitic transformation B2 → R and R → B19 (orthorhombic) was observed. By aging the alloy at 700°C for 6 h, no significant effect was found on phase transition behavior and transformation temperatures.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-125-B-127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Evolution of Microstructure for Ductile Iron Treated under Different Thermal Cycles Using Electrolytic Plasma Treatment
Autorzy:
Ayday, A.
Durman, M.
Powiązania:
https://bibliotekanauki.pl/articles/1195233.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.bd
52.50.-b
81.40.Cd
81.40.Ef
81.30.Kf
Opis:
The effects of the thermal cycles on the microstructures and properties of ductile iron modified by electrolytic plasma treatment were investigated. Microstructure changes occurring in the modified surface were characterized with scanning electron microscopy, X-ray diffractometry techniques. Martensitic structure evolved in the heat affected zone and ledeburite structure was produced in the molten zone of the ductile iron. Microhardness of the treated specimens improved considerably as compared to the original sample. X-ray diffraction clearly revealed the formation of a martensite phases in the modified zone.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 577-578
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TiPd Shape Memory Alloy Studied by PAC Method
Autorzy:
Kulińska, A.
Wodniecki, P.
Powiązania:
https://bibliotekanauki.pl/articles/1378170.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.kf
62.20.fg
Opis:
Perturbed angular correlation (PAC) method was applied to study the martensitic phase transition of the TiPd shape memory alloy doped with In, Hf, and Zr. The hyperfine interaction parameters and their concentration and temperature dependences for $\text{}^{111}In$/$\text{}^{111}Cd$ and $\text{}^{181}Hf$/$\text{}^{181}Ta$ probe atoms were determined. The influence of ternary element additions on the electric field gradients at Pd site was evidenced. A decrease of the martensite start temperature $(M_{S})$ and an increase of the width of the hysteresis loop $(T_{H})$ with an increasing concentration of the impurities in TiPd alloy was observed. These relationships are much stronger for In and Zr, than for Hf admixture.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 936-939
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Hardening of Ductile Cast Iron by Electrolytic Plasma Technology
Autorzy:
Ayday, A.
Durman, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399796.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.Kf
82.33.Xj
68.35.bd
Opis:
Traditional surface modification obligations, surface coatings, and other methods of surface treatment are used to increase the hardness and mechanical properties of specimen surfaces. But those techniques are limited due to the high equipment cost, and material consumption. Electrolytic plasma technology is a special heat treatment process employing electrolysis in an aqueous solution under particular conditions, for instance voltage, current, electrolyte, duration, and heating-quenching rate. In this study, surface modification of GGG70 cast iron was carried out by using electrolytic plasma treatment. Certain voltage and ampere values were performed to obtain good surface properties. Metallographic studies were carried out with an optical microscope to study the hardened and modified surfaces. The effect of impulse time on surface temperature was investigated and it was observed that the temperature on the workpiece increased with increasing impulse time. It was found that the electrolytic plasma treatment could significantly increase hardness of the cast iron.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 291-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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