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Wyświetlanie 1-15 z 23
Tytuł:
Some Problems in Quantitative Auger Analysis of Metallic Alloys
Autorzy:
Mróz, S.
Doliński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1892438.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Fv
68.35.Dv
Opis:
Factors determining the Auger signal intensity are discussed. It is indicated that using standards is the only reasonable way for quantitative Auger analysis (QAA). Approaches to QAA without and with matrix corrections are presented. It is shown that the matrix correction connected with atomic concentrations of pure standards is the most important and that the other matrix corrections (e.g. those connected with the attenuation length and backscattering factor) do not improve appreciably the QAA exactness in many examples taken from the literature. The examples indicate that in the case of metallic alloys the properly performed QAA gives the relative atomic concentrations with the error not exceeding few percent.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 201-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional Auger Electron Spectroscopy - Possibilities, Limitations and Proposal of Improvements
Autorzy:
Mróz, S.
Rok, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/1811503.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.J-
68.35.Rh
Opis:
Physical foundations of directional auger electron spectroscopy (DAES) and calculation of DAES profiles in single scattering cluster approach are presented. Limitations of this method (application only to investigation of the crystalline structure of homogeneous samples) is shown and explained as the result of participation of inelastically scattered electrons in the Auger signal generation. To extend the DAES application for the interface structure, the use of as low as possible energy of primary electrons is proposed because in such a case the participation of inelastically scattered electrons becomes negligible and single scattering cluster calculation should describe correctly the DAES profiles for interfaces. Besides, the extension of single scattering cluster calculations to the second elastic scattering is recommended. To check the technical possibility of DAES use in the proposed version, the Auger spectrum of Cu LMM peaks was recorded for a $Cu_3Au$(001) sample with the use of a retarding field analyzer with the primary beam energy 1200 eV. Quality of this spectrum seems to be good enough for using in DAES.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-93-S-101
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Composition of Surfaces and Interfaces with the Use of Auger Electron Spectroscopy
Autorzy:
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1945166.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.55.-a
Opis:
Processes leading to the Auger electron emission from the sample bombarded with a primary electron beam are discussed. It is shown that every element has its characteristic spectrum of Auger lines, and that owing to a small inelastic mean free path of Auger electrons, information obtained from Auger electron spectroscopy concerns the composition of surface layer of 0.5-1 nm thick. Experimental methods of Auger electron spectroscopy are presented together with problems connected with separation of Auger electrons from the secondary electron spectrum. Advantages and disadvantages of some electron energy spectrometers are considered. Methods of quantitative Auger analysis of homogeneous samples with the use of standards and catalogues of Auger spectra are presented. The role of matrix corrections in quantitative Auger analysis is discussed. Problems arising in Auger analysis of insulating samples are considered and methods of discharging of such samples are presented. Depth profiling of inhomogeneous samples by Auger electron spectroscopy with ion bombardment sputtering is described, and possibilities and limitations of this procedure are discussed. Principles of scanning Auger microscopy are presented. Factors determining the lateral resolution are discussed. Possibilities of Auger electron spectroscopy and scanning Auger microscopy in analysis of composition of grain boundaries exposed by in situ fracture are presented and discussed. Possibilities and limitations of Auger electron spectroscopy in the investigation of solid state surfaces are summarized.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 183-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groove Rolling Process of Mg/Al Bimetallic Bars
Autorzy:
Mróz, S.
Stefanik, A.
Szota, P.
Powiązania:
https://bibliotekanauki.pl/articles/353827.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bimetallic bars
Mg alloy
groove rolling
multi-radial passes
Opis:
The paper presents the results of the experimental tests of Mg/Al bimetallic bars rolling process in classic and multi-radial modified round-oval-round passes. The bimetallic bar consist of magnesium core, grade AZ31 and aluminium outer layer, grade 1050A. The stocks were round bars with diameter 22.5 mm with an aluminium layer share of 28%. As a result of rolling in four passes, bars of a diameter of about 17 mm were obtained. A bimetallic feedstock was manufactured using an explosive welding method. The use of the designed arrangement of multi-radial modified stretching passes resulted in obtaining Mg/Al bimetallic bars with an uniform distribution of the cladding layer over the bar perimeter and high quality of shear strength between individual layers compared to Mg/Al bars obtained in the classic passes.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1067-1072
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Processes Occurring during Silver Adsorption on Copper and Nickel at Elevated Temperatures
Autorzy:
Wodecki, J.
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1943977.pdf
Data publikacji:
1996-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.55.-a
Opis:
A flux of silver atoms reevaporated from the copper and nickel targets during deposition of silver was measured as a function of the target temperature during spontaneous cooling from 1150 K and during heating the target with deposited several silver monolayers from room temperature to 1150 K. Differences in the measured dependences for both targets give the evidence of competition between reevaporation of silver atoms from the copper surface and their dissolution in the copper bulk and are in accordance with the lack of silver dissolution in nickel. Thus, the role of silver dissolution in the copper surface layer during silver adsorption at elevated temperatures is experimentally evidenced. Activation energy for silver dissolution in the copper substrate was estimated to be equal to 1.7-2.4 eV/atom.
Źródło:
Acta Physica Polonica A; 1996, 89, 1; 69-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Very Thin Silver Layer Growth on the Cu(1II) Face at Different Temperatures
Autorzy:
Mróz, S.
Stachnik, B.
Powiązania:
https://bibliotekanauki.pl/articles/1892480.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.55.-a
Opis:
Measurements of work function changes (ΔΦ) and Auger Electron Spectroscopy were used for investigation of very thin silver layer adsorption on the (111) face of copper crystal. At room temperature the layer-by-layer growth was observed while at temperatures above 850 K ΔΦ and the Auger peak height kinetics indicated the presence of silver diffusion to the surface layer of the copper sample.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 233-238
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and Experimental Analysis of Mg/Al Bimetallic Handle Forging Process
Autorzy:
Szota, P.
Mróz, S.
Gontarz, A.
Stefanik, A.
Powiązania:
https://bibliotekanauki.pl/articles/355618.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg/Al bimetallic forging
die forging
numerical modelling
FEM
Opis:
The present paper reports the results of theoretical and experimental studies of the process of die forging a bimetallic door handle intended for the production of a helicopter. The aim of the studies was to develop and implement a technology for die forging of a product with a specific mass similar to that of magnesium alloys which will have, however higher corrosion resistance. Numerical modelling and industrial tests were carried out based on the previously forging processes for an AZ31 alloy door handle. The material for the tests was a bimetallic bar produced by the explosive welding method, in which the core was of alloy AZ31, and the cladding layer was made of 1050A grade aluminium. The studies were conducted for two variants: Variant I – the forging process was mapped by numerical modelling and industrial tests for the die shape and parameters used in the forging of the AZ31alloy door handle, Variant II – the tool shape was optimized and process parameters were selected so as to obtain a finished product characterized by a continuous Al layer. From the theoretical studies and experimental tests carried out it has been found that the application of the Variant I does not assure that a finished door handle characterized by a continuous cladding layer will be produced. Within this study, a novel method of bimetallic door handle die forging (Variant II) has been developed, which limits the amount of the flash formed and assures the integrity of the cladding layer.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1503-1512
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Inelastic Mean Free Path of Electrons in Noble Metals
Autorzy:
Doliński, W.
Mróz, S.
Palczyński, J.
Gruzza, B.
Bondot, P.
Porte, A.
Powiązania:
https://bibliotekanauki.pl/articles/1892437.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Fk
79.20.Fv
Opis:
The experimental values of Inelastic Mean Free Path (λ$\text{}_{IMFP}$) of electrons in noble metals (Ag, Au, Cu) are determined in the electron energy range 150-2000 eV. The method used consists of the measurements and theoretical calculations of the coefficient of elastic backscattering of electrons from a solid surface η$\text{}_{e}$. The obtained values of λ$\text{}_{IMFP}$ are compared with the data available in the literature.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 193-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the Durability of Separating Rolls During Rolling Ribbed Bars in the Three-Strand Technology
Autorzy:
Strycharska, D.
Szota, P.
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/356549.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ribbed bar
slitting passes
wear
numerical modeling
FEM
Opis:
The paper presents the results of investigations aimed at enhancing the durability of slitting passes in the process of three-strand rolling of 16 mm-diameter ribbed bars. Using the Forge2011® computer program, numerical modelling of the rolling process was carried out in order to examine the variations in band shape in individual rolling passes, to verify the correctness of the designed new slitting pass system, to determine the local strains in the rolled band, and then to determine the distribution of unit friction force work on the roll groove surface. From the obtained investigation results it was found that the application of the new roll pass design in stands 13-16 increased their durability in the rolling process by approx. 30%. The wear of the roll sets for the stands under examination after rolling out the annual 16 mm-diameter bar production volume was determined in the study. The obtained numerical modelling results were verified in experimental tests.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1535-1540
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Order-Disorder Transition in the $Cu_3Au$ (001) Surface Layer Investigated with the Use of DAES and DEPES
Autorzy:
Rok, Ł.
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1811500.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.J-
68.35.Rh
Opis:
The composition of the first atomic layer of $Cu_3Au$(001) crystal (about half-and-half copper and gold atoms) changes only slowly even at temperatures much higher than that of the order-disorder transition ($T_C$ = 663 K). Theoretical and experimental works show a general trend of these changes but they differ in quantitative findings. In the present work we used directional elastic peak electron spectroscopy and directional Auger electron spectroscopy to investigate changes of atomic order and composition in the first atomic layers of the $Cu_3Au$(001) crystal during the sample temperature increase. The height of central maximum in DEPES polar profile of the sample investigated was measured as a function of sample temperature. It was found that the measured dependence is linear, but the slope of this dependence changes abruptly around $T_C$. This change seems to be connected with disappearance of the atomic order in the first and second atomic layers. In DAES the height of the Auger peaks for copper and gold low energy transitions (MVV and NVV, respectively) were measured in the dN(E)/dE mode as a function of the primary electron beam incidence angle. The composition of the first, second, and third atomic layers was determined by fitting the ratio of calculated DAES polar profiles for copper and gold to such a ratio for the measured profiles.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-115-S-124
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and Experimental Analysis of Formability of Explosive Welded Mg/Al Bimetallic Bars
Autorzy:
Mróz, S.
Szota, P.
Bajor, T.
Stefanik, A.
Powiązania:
https://bibliotekanauki.pl/articles/353760.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg-Al bimetallic bars
plastic deformation
physical modelling
numerical modelling
FEM
Opis:
The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of Mg/Al bimetallic specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Bimetallic bars of an outer diameter of 22.5 mm and a cladding layer thickness of 1.7 mm were obtained by the explosive welding method. Samples for formability tests, characterized by a diameter-to-length ratio of 1, were taken from the bars. The theoretical studies and experimental tests were carried out for the temperature range from 300 to 400°C and for different strain rates. Based on the obtained investigation results it has been found that the main parameters influencing the formability of Mg/Al bimetallic bars are strain rate than the process temperature.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 501-507
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modelling of the working rolls wear during rods rolling process
Numeryczne modelowanie zużycia walców podczas procesu walcowania prętów
Autorzy:
Szota, P.
Mróz, S.
Stefanik, A.
Dyja, H.
Powiązania:
https://bibliotekanauki.pl/articles/351282.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zużycie
walcowanie
pręty okrągłe
wear
rolling
round bar
FEM
Archard's model
Opis:
Numerical modelling of the round bar rolling process, while considering the wear of the passes depending on their shape, was carried out within the present work. For the theoretical study of the rolling process, the Forge2008Ž was employed, which is finite element method-relying software that enables the thermomechanical simulation of rolling processes in a triaxial strain state. The wear model implemented in the Forge2008Ž permits no quantitative evaluation, but only comparative analysis of the wear of rolls. In order to use the results of simulation employing the simplified Archard model for the quantitative evaluation of roll wear, it is necessary to define the wear factor and hardness of the tool as a function of temperature. The paper present a methodology for the determination of the quantitative wear of rolls based on the results of computer simulations performed using the Forge2008Ž software for a selected oval pass during rolling of round bars.
W pracy przeprowadzono numeryczne modelowanie procesu walcowania prętów okrągłych z uwzględnieniem zużycia wykrojów w zależności od ich kształtu. Do badań teoretycznych procesu walcowania zastosowano program komputerowy Forge2008Ž, który oparty jest na metodzie elementów skończonych i pozwala na termomechaniczną symulację procesów walcowania w trójosiowym stanie odkształcenia. Model zużycia stosowany w programie komputerowym Forge2008Ž nie pozwala na ilościową ocenę zużycia walców a jedynie na analizę porównawczą. W celu wykorzystania wyników symulacji z zastosowaniem uproszczonego modelu Archarda, do ilościowej oceny zużycia walców, konieczne jest zdefiniowanie współczynnika zużycia i twardości narzędzia w funkcji temperatury. W pracy przedstawiono metodykę wyznaczenia ilościowego zużycia walców na podstawie wyników symulacji komputerowych wykonanych za pomocą programu Forge2008Ž dla wybranego przepustu owalnego podczas walcowania prętów okrągłych.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 2; 495-501
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Experimental Modeling of Plastic Deformation the Multi-Layer Ti/Al/Mg Materials
Autorzy:
Mróz, S.
Stefanik, A.
Szota, P.
Kwapisz, M.
Wachowski, M.
Śnieżek, L.
Gałka, A.
Szulc, Z.
Powiązania:
https://bibliotekanauki.pl/articles/354174.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-layered Ti/Al/Mg material
plastic deformation
physical modelling
numerical modelling
Opis:
The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of multi-layered Ti/Al/Mg specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Cuboidal specimens were cut off from the plates obtained in the explosive welding method. Based on the obtained investigation results it has been found non uniform deformation of the particular layer as a result their different value of flow stress.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1361-1368
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Effect of Rolling Speed on the Capability to Produce Bimodal-Structure AZ31 Alloy Bars in the Three-High Skew Rolling Mill
Autorzy:
Stefanik, A.
Szota, P.
Mróz, S.
Powiązania:
https://bibliotekanauki.pl/articles/352307.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
three-high skew rolling mill
radial-shear rolling
magnesium alloys
bimodal-structure bars
FEM
Opis:
A numerical analysis of the process of single-pass rolling of AZ31 magnesium alloy bars in the three-high skew rolling mill has been carried out in the study. Based on the obtained investigation results, the effect of rolling speed on the band twist and the state of stress and strain occurring in the rolled band has been determined. From the obtained results of the numerical studies it has been found that with the increase in rolling speed the unit band twist angle θ, increase, which translates into an increase in the value of tangential stress in the axial zone of the rolled bar. This contributes directly to an increase in redundant strain in the rolled bar axial zone, which brings about a structure refinement. To verify the effect of rolling speed on the flow pattern and the stress and strain state, experimental tests were carried out. It has been found from the tests that the band twist (flow pattern) contributes to obtaining a bimodal structure in the bar cross-section.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 329-335
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis Of Rolls Wear During The Ribbed Bars Multi-Slit Rolling Process
Analiza zużycia walców podczas wielożyłowego walcowania prętów żebrowanych
Autorzy:
Szota, P.
Strycharska, D.
Mróz, S.
Stefanik, A.
Powiązania:
https://bibliotekanauki.pl/articles/958232.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
groove-rolling
ribbed bars
wear
numerical modeling
FEM
walcowanie w wykrojach
pręty żebrowane
zużycie
modelowanie numeryczne
MES
Opis:
An analysis of the roll wear in the multi-strand rolling of reinforced concrete ribbed bars has been made in the study. In the technology under consideration, the longitudinal partition of the band takes place in special slitting passes, while the separation of individual strands – in idle separating rollers. During rolling, the slitting passes undergo fast wear compared to the remaining passes of the rolling line. The paper reports the results of theoretical and experimental examinations, on the basis of which the wear of the slitting passes in the 16 mm-diameter ribbed bar three-strand rolling process has been determined. The theoretical examination was done using the Forge2011® software program, while experimental tests were carried out in a D350 medium-size continuous rolling mill. Based on the analysis of the investigation results, the wear coefficient was established for the slitting passes, which allowed the determination of their quantitative wear.
W pracy przeprowadzono analizę zużycia walców podczas wielożyłowego walcowania prętów żebrowanych przeznaczonych do zbrojenia betonu. W tej technologii wzdłużny podział pasma następuje w specjalnych wykrojach rozdzielających a oddzielenie poszczególnych żył w nienapędzanych rolkach rozdzielających. Podczas walcowania wykroje rozdzielające ulegają szybkiemu zużyciu w porównaniu do pozostałych wykrojów linii walcowniczej. W pracy przedstawiono wyniki badań teoretycznych i doświadczalnych na podstawie których określono zużycie wykrojów rozdzielających w procesie trójżyłowego walcowania prętów żebrowanych o średnicy 16 mm. Badania teoretyczne wykonano za pomocą programu komputerowego Forge2011®, natomiast badania doświadczalne przeprowadzono w średniej walcowni ciągłej D350. Na podstawie analizy wyników badań określono współczynnik zużycia dla wykrojów rozdzielających, co umożliwiło wyznaczenie ich ilościowego zużycia.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 815-820
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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