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Tytuł:
$K_{β}/K_{α}$ X-Ray Intensity Ratios for Cr, Mn, Fe, and Co Excited by 8.735 keV Energy
Autorzy:
Yılmaz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1398200.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
K X-ray intensity ratios
X-ray fluorescence
cross-sections
Opis:
In this study, the K shell intensity ratios $K_{β}/K_{α}$ have been experimentally determined for the elements Cr, Mn, Fe, and Co. Measurements have been carried out at 8.735 keV excitation energy by using secondary excitation method. K X-rays emitted by samples have been counted by a Si (Li) detector with 160 eV resolutions at 5.9 keV. The measured values were compared with the calculated theoretical values. The obtained values are in good agreement with the calculated values.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1227-1230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
0.2-kJ and 2-kJ high rep rate Dense Plasma foci : their design, technology, and applications
Autorzy:
Dubrovsky, A. V.
Gribkov, V. A.
Ivanov, Y. P.
Lee, P.
Lee, S.
Liu, M.
Samarin, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/146546.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
DPF installation
miniature focus chamber
soft and hard X-ray radiation
Opis:
The paper presents various designs of several medium and small size Dense Plasma Focus (DPF) chambers intended for numerous applications, a description of technologies used in these facilities, and some results reached with these devices by using a number of diagnostic techniques. In present experiments the DP foci have been used mainly as an X-ray source. We discuss here how it is possible to satisfy absolutely new and very strict demands on the construction and technology for the devices to be eventually applied in science and industry. Between these characteristics there are a high repetition rate (typically 1…15 Hz) and a long lifetime (over 1 million shots). Their switching elements, a collector and chambers must withstand a high quasi-continuous heat load (up to 100 kW). High energy density in the central part of the chamber anode and the necessity to provide a channel for radiation extraction demanded a special construction and specific materials implementation in this region. Their X-ray spectrum should be tuned. They have to operate with different working gases and preferably in a wide range of pressures. All these points are discussed in this report. Capabilities of the described techniques are illustrated by results of the recent experimental studies carried out with facilities located at the Nanyang Technological University (NX1) as well as at the Lebedev Physical Institute (PF-0.2).
Źródło:
Nukleonika; 2001, 46, suppl. 1; 107-111
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2-Tetrazene Derivatives as New Energetic Materials; Synthesis, Characterization and Energetic Properties
Autorzy:
Miró Sabaté, C.
Delalu, H.
Powiązania:
https://bibliotekanauki.pl/articles/358238.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
2-tetrazene
energetic materials
X-ray diffraction
NMR spectroscopy
Opis:
The oxidation of 1,1-dimethylhydrazine with aqueous monochloramine yielded (E)-1,1,4,4-tetramethyl-2-tetrazene (1) as a pale yellow liquid with hypergolic properties. 1 can be oxidized with potassium permanganate to form (E)-1-formyl-1,4,4-trimethyl-2-tetrazene (2) and (E)-1,4-diformyl-1,4dimethyl-2-tetrazene (3). Additionally, 1 reacts with a diethyl ether solution of monochloramine to form a stable 1,1,4,4-tetramethyl-2-tetrazenium chloride salt (4). The chloride in salt 4 was exchanged with various energetic anions, such as nitrate (5), perchlorate (6), 5,5´-azobistetrazolate (7*6H2O), picrate (8) and azide (9). All materials were characterized by analytical and spectroscopic methods and the solid state structures of compounds 2-8 were elucidated. Due to the energetic nature of these materials, they were submitted to friction and impact sensitivity tests and DSC analysis was used to assess their thermal stabilities. Furthermore, the heats of formation of compounds 2-8 were computed using quantum mechanical methods (CBS-4M) and their detonation parameters (pressure and velocity) and specific impulses were also calculated. Lastly, the 2-tetrazene derivatives presented here are of potential interest either as building blocks or as a new class of low toxicity, low sensitivity energetic materials.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 515-537
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D-AFM Nano-structural Features and Magnetic Properties of Indium-Doped Vanadate Ceramic Ca3-xInxVO8
Autorzy:
Elsabawy, Khaled M.
Powiązania:
https://bibliotekanauki.pl/articles/1186749.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Magnetic properties
SE-microscopy
Semiconductors
Solution route synthesis
X-ray diffraction
Opis:
Doped vanadate ceramics with general formula Ca3-xInxVO8 were synthesized by using two different precursors ( oxalate & citrates) to get maximum homogeneity inside the bulk of the material where x = 0.05 and 0.25 mole. Structural and microstructural properties were monitoring by using both of XRD and SEM evaluating that indium doped - calcium vanadate ceramic has the semiconducting classical doubly perovskite phase as proved in the X-ray diffractogram, grain size of the material bulk was found to be in between 1.57- 2.23 μm which are lower than those reported in literatures .Magnetic measurements indicated that the In- doped- calcium vanadate ceramic exhibits an semiconducting behavior confirming that indium- hole dopings enhance the paramagnetic character and semi-conduction mechanism of the hexagonal perovskite phase. Furthermore 3D-AFM investigations were made to study effect of indium doping on the surface topology and grain size in the material bulk.
Źródło:
World Scientific News; 2016, 32; 48-59
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
4,6-Diazido-N-(2,4,6-trinitrophenyl)-1,3,5-triazin-2-amine (TNADAzT) and Its Silver Salt − Synthesis and Characterization
Autorzy:
Musil, T.
Matyáš, R.
Zeman, S.
Růžička, A.
Lyčka, A.
Majzlík, J.
Vala, R.
Knotek, P.
Powiązania:
https://bibliotekanauki.pl/articles/358533.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
azido derivative of triazine
silver salt
sensitivity
MTX-1
X-ray
Opis:
4,6-Diazido-N-(2,4,6-trinitrophenyl)-1,3,5-triazin-2-amine (TNADAzT) and its silver salt (AgTNADAzT) were prepared and characterized. Elemental analysis, FTIR, NMR, DSC, AAS and X-ray diffraction were used for analytical characterization. The sensitivities of TNADAzT and AgTNADAzT were determined and compared with common explosives and MTX-1. The crystal density of TNADAzT is 1.794 g·cm−3 and its heat of formation 899 kJ·mol−1. The sensitivity of TNADAzT to impact and friction slightly exceeds PETN; the sensitivity to electrostatic discharge is lower than RDX. The sensitivity of AgTNADAzT is on the level of a primary explosives (between mercury fulminate and PETN). The initiation efficiency of AgTNADAzT is higher than 200 mg (acceptor PETN compressed by 64-70 MPa) and therefore excludes it from practical use as a primary explosive in detonators.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 2; 304-320
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer spectroscopy and X-ray diffraction study of gadolinites REE2Fe2+Be2Si2O10 from Lower Silesia (Poland) and Ytterby (Sweden)
Autorzy:
Malczewski, D.
Powiązania:
https://bibliotekanauki.pl/articles/148858.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gadolinite
Mössbauer spectroscopy
X-ray diffraction
Opis:
This paper reports the results of 57Fe Mössbauer spectroscopy, X-ray diffraction (XRD) and gamma-ray spectroscopy studies of partially metamict gadolinites from Szklarska Poręba and Zimnik (Lower Silesia, Poland), a fully metamict gadolinite sample from Ytterby (Sweden) and a crystalline sample obtained after annealing of a fragment of the sample from Ytterby at 1373 K in an argon atmosphere. Both fully metamict and crystalline gadolinite show divalent iron exclusively in octahedral coordination. Changes of the amplitudes ratio of high energy to low energy absorption peaks from Fe2+ quadrupole doublets are strictly correlated with calculated absorbed alpha-dose and the metamictization stages of the gadolinite specimens. In this respect, one of the samples is in conflict with the estimated radiation dose based on age and radionuclide concentrations. In this case, Mössbauer spectroscopy shows that the sample had to be naturally annealed over geologic time.
Źródło:
Nukleonika; 2003, 48,suppl.1; 41-44
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Case Study of Explosion A Single Solar Burst Type III and IV Due to Active Region AR1890
Autorzy:
Hamidi, Z. S.
Ibrahim, M. B.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412554.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar burst
III
IV
radio region
X-ray region
solar flare
active region
Opis:
Using data from a BLEIN Callisto site, we aim to provide a comprehensive description of the synopsis formation and dynamics of a a single solar burst type III and IV event due to active region AR1890. This eruption has started since 14:15 UT with a formation of type III solar burst. To investigate the importance of the role of type III solar burst can potentially form a type IV solar burst, the literature review of both bursts is outlined in detailed. The orientation and position of AR1890 make the explosion of a class C-solar flare is not directly to the Earth. Nevertheless, it is clear that the interactions of others sunspots such as AR1893,AR1895,AR1896, AR1897 and AR1898 should be studied in detail to understand what makes the type III burst formed before the type IV solar burst.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 171-180
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison between the crystal and solution structures of Escherichia coli asparaginase II.
Autorzy:
Kozak, Maciej
Jurga, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/1043790.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
structure in solution
small angle X-ray scattering
asparaginase
Opis:
The small angle X-ray scattering (SAXS) pattern of the homotetrameric asparaginase II from Escherichia coli was measured in solution in conditions resembling those in which its crystal form was obtained and compared with that calculated from the crystallographic model. The radius of gyration measured by SAXS is about 5% larger and the maximum dimension in the distance distribution function about 12% larger than the corresponding value calculated from the crystal structure. A comparison of the experimental and calculated distance distribution functions suggests that the overall quaternary structure in the crystal and in solution are similar but that the homotetramer is less compact in solution than in the crystal.
Źródło:
Acta Biochimica Polonica; 2002, 49, 2; 509-513
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A high-accuracy method of computation of X-ray waves propagation through an optical system consisting many lenses
Autorzy:
Kshevetskii, S.
Wojda, P.
Powiązania:
https://bibliotekanauki.pl/articles/1938594.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
X-ray wave
X-ray optic
lens
non-uniform medium
focusing
numerical method
simulation
finite differences
stability
numerical error
wave phase
electromagnetic wave
fast oscillating function
Opis:
The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. Two differential equations are contemplated for solving the problem for electromagnetic wave propagation: first – an equation for the electric field, second – an equation derived for a complex phase of an electric field. Both equations are solved by the use of a finite-difference method. The simulation error is estimated mathematically and investigated. The presented results for equations show that in order to establish a high accuracy computation a much smaller number of points is needed to solve the problem of X-ray waves propagation through a multi-lens system when the method for the second equation is used. The reason for such a result is that the electric field of a wave after passing through many lenses is a quickly oscillating function of coordinates, while the electric field phase is a quickly increasing, but not oscillating function. Therefore, a very detailed difference grid, which is necessary to approximate the considered electric field can be replaced by not such a detailed grid, when computations are made for the complex wave of the electric field. The simulation error of both suggested methods is estimated. It is shown that the derived equation for a phase function allows efficient simulation of propagation of X-rays for the multi-lens optical system.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 171-186
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-analytical approach for the analysis of cation distribution in a aluminoceladonite structure
Autorzy:
Kądziołka-Gaweł, Mariola
Dulski, Mateusz
Czaja, Maria
Krzykawski, Tomasz
Szubka, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2172615.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminoceladonite
ions position characterization isomorphic substitutions
Fe bearing phyllosilicates
X-ray photoelectron spectroscopy
Mössbauer spectroscopy
Raman spectroscopy
glinokrzemiany
krzemiany warstwowe
rentgenowska spektrometria fotoelektronów
XPS
spektroskopia mössabuerowska
spektroskopia Ramana
Opis:
In this paper cation arrangement in two samples of aluminoceladonite, emerald green and dark-green were studied by Mössbauer, Raman and X-ray photoelectron spectroscopies. The X-ray photoelectron spectroscopy (XPS) spectra obtained in the region of the Si2p, Al2p, Fe2p, K2p, and O1s core levels provided information, for the first time highlighting a route to identify the position of Si, Al, K, and Fe cations in a structure of layered silicates. The XPS analysis showed the presence of Al in tetrahedral and octahedral coordination while the K2p line indicated the possibility of K+ substitution by other cations in interlayer sites. Mössbauer spectroscopy provided information about crystal chemistry with respect to the local electronic and geometric environment around the Fe atom and to distortions of the polyhedra. It turned out that iron was located mostly in the cis-octahedra position wherein about 75% of iron appeared in the form of Fe3+. The most preferred cation combinations around Fe corresponded to 3Fe3+ ions and MgFe2+Fe3+/2MgFe3+. Raman spectroscopy illustrated aluminium substitution in silicon and iron positions wherein the concentration of the aluminium determined the degree of structural distortion within the layered system. These isomorphic substitutions implied a typical band arrangement in the hydroxyl region, which has not been observed in celadonites so far.
Źródło:
Acta Geologica Polonica; 2022, 72, 3; 353--368
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Quality Control Test for General X-Ray Machine
Autorzy:
AL-Jasim, Ali Kareem
Hulugalle, S.N.C.W.M.P.S.K.
Al-Hamadani, Haider Kamil
Powiązania:
https://bibliotekanauki.pl/articles/1178771.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Quality Assurance
Quality Control
X-Ray Machine
Opis:
The aim of a quality assurance program is to assist a radio-diagnostic facility in consistently obtaining adequate radiological information with a minimum of dose and a minimum of cost. An integrated part of a quality assurance program is quality control ascertaining quality by measurements and other procedures. When procuring equipment, a specification is worked out taking into account all aspects of the performance of the equipment including the desired tolerances of technique factors. In this study the seven tests (beam alignment, beam collimation, reproducibility, accuracy of kv, time accuracy, half value layer (HVL) and leakage) were carried out for the newly installed General X-Ray machine at Nuclear Malaysia and were in the acceptable limits. Such a test will be the responsibility of a qualified physicist or engineer. The status test is carried out in order to establish the functional status of the equipment. The test is performed immediately after the acceptance test or as an integrated part of it. The test will be repeated when repair influencing the functional status has taken place like the acceptance test; the status test will comprise absolute measurements and will likewise be the responsibility of a qualified physicist or engineer.
Źródło:
World Scientific News; 2017, 90; 11-30
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on fibre-reinforced concrete elements properties based on the case of habitat modules in the underwater sills
Autorzy:
Kurpińska, Marzena
Grzyl, Beata
Kristowski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/259547.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrotechnical constructions
fibre-concrete
mechanical concrete
strength
X-ray tomography
Opis:
Hydrotechnical constructions are mostly objects functioning in extreme conditions and requiring a custom-made construction project. In the case of using prefabricated elements, it is required to develop production, transport, assembly, conservation and repair technology. Concerning the problem of concrete cracks, modern repair systems allow positive effects to be achieved in many cases of concrete elements repair. In this work an attempt has been made to assess the properties of concrete, situated in the Baltic Sea environment, in which traditional rebar was partly replaced by dispersed fibre-phase. Fibre-reinforced concrete belongs to the group of composite materials. The presence of fibres helps to increase the tensile strength, flexural strength and resilience and also prevents the appearance of cracks. In the given paper we will also discuss basic parameters of steel and polymer fibres and the influence of both types of fibres on the maturing and hardened concrete. In this work special attention has been paid to the advantages of polypropylene and polymer fibres with regard to commonly-known steel fibres. The use of synthetic fibres will be advantageous in constructions where the reduction of shrinkage cracks and high resilience are essential. On top of that, the use of synthetic fibres is highly recommended when constructing objects that will be exposed to the impact of an aggressive environment. Undoubtedly, polymer fibres are resistant to the majority of corrosive environments. Fibre-reinforced concretes are a frequently implemented construction solution. The possibility of concrete modification allows the emergence of new construction materials with improved physical-mechanical properties, under the condition of being applied relevantly.
Źródło:
Polish Maritime Research; 2020, 1; 143-151
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced Materials & Technologies in Precisive Temperature Measurements
Zaawansowane materiały i technologie w precyzyjnych pomiarach temperatury
Autorzy:
Prokhorenko, S.
Mudry, S.
Panas, A. J.
Stadnyk, B
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/154994.pdf
Data publikacji:
2006
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
stopy eutektyczne Cd-Sn
Bi-Cd
dyfrakcja rentgenowska
różniczkowa kalorymetria skaningowa
temperaturowy punkt odniesienia
obróbka energetyczna
Cd-Sn
eutectic melts
X-ray diffraction
differential scanning calorymetry
temperature fix-point
energetical treatment
Opis:
The studies of eutectic melts Cd-Sn, Bi-Cd are carried out be means of X-ray diffraction, metallography and differential scanning calorymetry methods in order to check the possibility to use them as temperature fix-point. It is shown that outside energetic influence on melt can change some parameters of structure and physical properties.
Stopy eutektyczne Cd-Sn, Bi-Cd badane były metodami dyfrakcji rentgenowskiej, metalografii oraz różniczkowej kalorymetrii skaningowej w celu uzyskania wiedzy o możliwości używania ich jako temperaturowych punktów odniesienia. Wykazano, że zewnętrzna obróbka energetyczna stopów zmienia ich parametry strukturalne i właściwości fizyczne.
Źródło:
Pomiary Automatyka Kontrola; 2006, R. 52, nr 12, 12; 4-6
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced microstructure diagnostics and interface analysis of modern materials by high-resolution analytical transmission electron microscopy
Autorzy:
Neumann, W.
Kirmse, H.
Hausler, I.
Mogilatenko, A.
Zheng, C.
Hetaba, W.
Powiązania:
https://bibliotekanauki.pl/articles/199872.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electron microscopy
energy dispersive X-ray spectroscopy
electron energy loss spectroscopy
electron holography
Opis:
Transmission electron microscopy (TEM) is a powerful diagnostic tool for the determination of structure/property relationships of materials. A comprehensive analysis of materials requires a combined use of a variety of complementary electron microscopical techniques of imaging, diffraction and spectroscopy at an atomic level of magnitude. The possibilities and limitations of quantitative TEM analysis will be demonstrated for interface studies of the following materials and materials systems: Nickel-based superalloy CMSX-10, (Zn,Cd)O/ZnO/Al2O3, (Al,Ga)N/AlN/Al2O3, GaN/LiAlO2 and FeCo-based nanocrystalline alloys.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 237-253
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Amorphization and liquid state separation in Ni80-2xCuxFexP20 alloys
Amorfizacja i podział w stanie ciekłym w stopach Ni80-2xCuxFexP20
Autorzy:
Ziewiec, K.
Prusik, K.
Różycka, M.
Powiązania:
https://bibliotekanauki.pl/articles/263952.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
amorphous materials
amorphization
X-ray diffraction
transmission electron microscopy
materiały amorficzne
amorfizacja
dyfrakcja rentgenowska
transmisyjna mikroskopia elektronowa
Opis:
The aim of the work is to study the ability and potential of glass formation in Ni-Fe-Cu-P alloys. A series of alloys were produced in arc furnace (i.e. Ni70Fe5Cu5P20, Ni60Fe10Cu10P20, Ni50Fe15Cu15P20, Ni40Fe20Cu20P20, Ni30Fe25Cu25P20, Ni20Fe30Cu30P20). The primary microstructure of the ingots was studied. The ribbons in as-melt-spun state were characterized by X-ray diffraction (XRD). The Ni70Fe5Cu5P2, Ni60Fe10Cu10P20 melt-spun alloys were found to be amorphous. For higher copper and iron concentrations a crystalline structure was obtained after melt spinning. This correlated with the tendency for the formation of the Fe-based phases enriched in P and Cu-based poorly alloyed phases which resulted in the formation of crystalline microstructure in melt-spun ribbons. For higher concentration of Fe and Cu, microstructures of the alloys contained constituents resultant from a tendency for separation in the liquid state. It is observed that the formation of the crystal line melt-spun ribbons is caused by the attraction of phosphorus by iron and the formation of copper-based fcc phase.
Celem pracy było zbadanie podatności na zeszklenie oraz możliwości wytworzenia struktury szklistej w stopach wieloskładnikowych Ni-Fe-Cu-P. W piecu łukowym wytworzono serię stopów (tzn.: Ni70Fe5Cu5P20, Ni60Fe10Cu10P20, Ni50Fe15Cu15P20, Ni40Fe20Cu20P20, Ni30Fe25Cu25P20, Ni20Fe30Cu30P20). Badano strukturę pierwotną wlewków. Taśmy w stanie po odlewaniu na wirujący bęben badano za pomocą dyfrakcji rentgenowskiej. Stwierdzono, że stopy Ni70Fe5Cu5P20, Ni60Fe10Cu10P20 odlewane na wirujący bęben były amorficzne. Dla stopów o wyższych zawartościach miedzi i żelaza po odlewaniu na wirujący walec otrzymano strukturę krystaliczną. Fakt ten można powiązać z tendencją do tworzenia faz na osnowie żelaza wzbogaconych w fosfor oraz zubożonych w pozostałe składniki stopowe faz na osnowie miedzi,które przyczyniły się do tworzenia w odlewanych taśmach mikrostruktury krystalicznej. Dla wyższych zawartości żelaza i miedzi, mikrostruktury stopów zawierały składniki fazowe powstające w efekcie tendencji stopów do podziału fazowego w stanie ciekłym. Zaobserwowano, że tworze nie krystalicznych taśm jest spowodowane przez przyciąganie fosforu przez żelazo oraz tworzenie bogatej w miedź fazy o strukturze regularnej ściennie centrowanej.
Źródło:
Metallurgy and Foundry Engineering; 2014, 40, 1; 45-54
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 487

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