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  1. 4 Archives of Metallurgy and Materials
  2. 3 Archives of Materials Science
  3. 3 Archives of Materials Science and Engineering
  4. 3 Scientific Letters of Rzeszow University of Technology. Journal of Electrical Engineering
  5. 3 Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika
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  1. 3 Ziewiec K.
  2. 2 Babilas R.
  3. 2 Bukowska A.
  4. 2 Dośpiał M.
  5. 2 Griner S.
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  1. 1 2023
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1
Content available Explosive crystallisation of metal glasses based on Fe-B during pulsed laser heating. Experiment and modelling
Smolyakov O.V., Girzhon V.V., Mudry S.I., Nykyruy Y.S.
Archives of Materials Science and Engineering
|
2023
|
Vol. 119, nr 2
49--55
EN
Purpose: The structure evolution of amorphous metallic alloys during different kinds of thermal effects is an important problem of disordered systems physics. A precise evolutional model would allow predicting the formation of such a structural state, providing the necessary physical and mechanical alloy properties. Design/methodology/approach: The paper is devoted to the problem of modelling the explosive crystallisation process in metal glasses induced by laser, supplemented by experimental results. Findings: A theoretical model of laser-induced explosive crystallisation in metal glasses is proposed. A pulse laser heating method for the surface processing was developed, making it possible to obtain two-layer structures with an adjustable thickness of the amorphous crystalline layer. Research limitations/implications: The proposed model is assumed to test and optimes for metal glasses of other chemical compositions. Practical implications: A theoretical model of laser-induced explosive crystallisation in metal glasses allows for predicting and controlling structure changes to obtain the desired properties. Originality/value: The investigation of structure changes at rapid heating of amorphous alloys by experimental methods is very limited in obtaining data and their interpretation. For that reason, combining the modelling with experimental measurements is proposed. The results of this work have value for a scientist in material science, physics and engineering, which use nonequilibrium physical processes to obtain new materials, including nanoscale systems.
2
Content available Phase Transformation Analysis of the Amorphous Mg72Zn24Ca4 Alloy
Lelito J.
Archives of Foundry Engineering
|
2020
|
Vol. 20, iss. 3
21--24
EN
The paper presents research of metallic glass based on a Mg72Zn24Ca4 alloy. Metallic glass was prepared using induction melting and further injection on a spinning copper wheel. The X-ray diffractometer and differential scanning calorimeter (DSC) were used to investigate the phase transformation of the amorphous ribbon. The heat released in the crystallization process, during isothermal annealing, based on the differential scanning calorimeter investigation, was determined to be 166.18 Jg-1. The effect of isothermal annealing temperature on the kinetics of the amorphous alloy crystallization process using differential scanning calorimeter was investigated. For this purpose, two isothermal annealing temperatures were selected. The incubation time decreases as the temperature of the isothermal annealing increases from 300 to 252 seconds. The same relationship is visible in the case of duration of the phase transformation, which also decreases as the temperature of the isothermal annealing increases from 360 to 228 seconds. The obtained results show a significant influence of isothermal annealing temperature on the degree of phase transformation.
3
Content available Characterization of Ca50Mg20Zn12Cu18 Alloy
Hrapkowicz B., Lesz S.T.
Archives of Foundry Engineering
|
2019
|
iss. 1
75--82
EN
The Ca50Mg20Zn12Cu18 was assessed with different methods in order to characterize its basic characteristics, and to determine whether the amorphous alloy of such composition would be applicable as an implant material. The XRD analysis was conducted to conclude the structure of the initial material. The Ca50Mg20Zn12Cu18 ingot sample demonstrates crystalline structure containing two main intermetallic phases, however as-cast plates show features of an amorphous material, revealing the characteristic amorphous halo on the x-ray patterns. It was confirmed by the scanning electron microscopy method and fracture images revealing chevron pattern morphology with shell type fracture. Corrosion resistance, was studied using the potentiostatic analysis. The amorphous samples show higher resistance than the crystalline one. Post corrosion surface of the Ca50Mg20Zn12Cu18 alloy exhibits high concentration of magnesium and calcium hydroxides, forming the globular structures in large aggregates of spherical units.
4
Content available Wpływ rekrystalizacji na właściwości tłumiące stopu Fe75Zr4Ti3B17Cu1
Bocian M., Mech R., Myszka W., Przybylski M.
Zeszyty Naukowe Uczelni Jana Wyżykowskiego. Studia z Nauk Technicznych
|
2016
|
Nr 5
65--74
PL
Uważa się, że tłumienie w przypadku metali o strukturze amorficznej powinno ulec zmianie po ich rekrystalizacji. W niniejszej pracy przedstawiono wyniki badań tego zagadnienia. Badania przeprowadzono na stopie Fe75Zr4Ti3B17Cu1 wykonanym w taki sposób, aby otrzymać materiał o strukturze amorficznej. W celu określenia oczekiwanej zmiany w tłumieniu badanego materiału, przeprowadzono badania polegające na pomiarze wysokości odbicia, dla próbki przed obróbką termiczną i po takiej obróbce. Otrzymane rezultaty pokazały, że względne tłumienie próbki uległo zmniejszeniu po poddaniu jej obróbce cieplnej, tym samym potwierdzając wstępne założenia.
EN
It is expected that damping in amorphous metals changes after their recrystallization. For this purpose a study of this phenomena was investigated. A Fe75Zr4Ti3B17Cu1 alloy was manufactured in very specific conditions to obtain amorphous structure. To determine expected change of damping, a sample in form of a rod was tested for bounce height in controlled conditions before and after heat treatment that changed the material structure. The obtained results indicate a decrease of damping after heat treatment and therefore confirm the initial assumption.
5
Content available Wpływ boru i krzemu na własności magnetycznestopów na bazie żelaza
Radoń A., Łoński W., Babilas R.
Journal of Technology and Exploitation in Mechanical Engineering
|
2015
|
Vol. 1, nr 1-2
80--95
PL
W pracy przedstawiono wyniki badań struktury i wybranych własności magnetycznych szkieł metalicznych na osnowie żelaza. Próbki do badań w postaci taśm wytworzono metodą “melt spinning”. W ramach badań własności magnetycznych wyznaczono indukcję nasycenia oraz natężenie pola koercji i wartość namagnesowania. Zakładając, że namagnesowanie można podobnie zdefiniować jak w przypadku paramagnetyków (klasyczna teoria ferromagnetyzmu wykorzystująca model pola molekularnego – pola Weissa) opracowano metodykę opisu własności magnetycznych dla badanych stopów amorficznych. Ilościowy wpływ pierwiastków stopowych (B,Si) na własności magnetyczne badanych materiałów pozwolił określić wartość współczynnika mocy wpływu β, której wielkość zastępuje stałą pola molekularnego.
EN
The paper presents the results of structural and magnetic properties of selected iron- basedmetallic glasses. The samples in the form of tapes were prepared by "melt spinning".The study of the magnetic properties were determined saturation induction,magnetic coercivity and value of the magnetization. Taking advantage of the fact that the magnetization is defined similarly as in the case of paramagnetics (a classic theory of ferromagnetism that uses molecular field model –Weiss field) description model of the magnetic properties of amorphous material. Quantitative impact of alloying elements (B, Si) on the magnetic properties of the material allowed to determine the effect of power factor β , which replaces the fixed constant of molecular field.
6
Content available CO Oxidation Properties Of Selective Dissoluted Metallic Glass Composites
Kim S. Y., Lee M. H., Kim T. S., Kim B. S.
Archives of Metallurgy and Materials
|
2015
|
Vol. 60, iss. 2B
1227--1229
EN
Porous metallic materials have been widely used in many fields including aerospace, atomic energy, electro chemistry and environmental protection. Their unique structures make them very useful as lightweight structural materials, fluid filters, porous electrodes and catalyst supports. In this study, we fabricated Ni-based porous metallic glasses having uniformly dispersed micro meter pores by the sequential processes of ball-milling and chemical dissolution method. We investigated the application of our porous metal supported for Pt catalyst. The oxidation test was performed in an atmosphere of 1% CO and 3% O2. Microstructure observation was performed by using a scanning electron microscope. Oxidation properties and BET (Brunauer, Emmett, and Teller) were analyzed to understand porous structure developments. The results indicated that CO Oxidation reaction was dependent on the specific surface area.
7
Nanocrystallization of metallic glasses
Kulik T.
Zeszyty Historyczne Politechniki Warszawskiej
|
2014
|
z. 16
23--39
EN
The paper summarizes briefly the current status of research in the field of nanocrystallization of metallic glasses especially highlighting the influence of glass composition and conditions of devitrification process on size, morphology and composition of crystallization products. Conventional crystallization creates a nanocrystalline structure only in glasses with particular compositions. Any metallic glass ,decomposing in a primary crystallization process, can be converted into partially nanocrystalline material using non-conventional methods of heat treatment, e.g. high-temperature or low-temperature nanocrystallization. Temperature of devitrification process influences sizes and compositions of crystallization products for any volume fraction of crystalline phase. The change of crystallites sizes can change their morphologies. The change of a crystallite composition usually affects the lattice parameter but also can result in a change of crystallographic structure of the same phase or in formation of another phase. Composition of primary crystallites is dependent on temperature as well as on time of devitrification process. The lower the annealing temperature and the shorter the annealing time (smaller crystallites) the more the crystallites composition differs from the equilibrium state.
8
Content available remote Nowoczesne biomateriały
Sułkowski B.
Stal, Metale & Nowe Technologie
|
2014
|
nr 3-4
66--67
PL
Stopy metali znalazły szerokie zastosowanie w medycynie, m.in. jako narzędzia chirurgiczne, elementy łączne, np. kości, oraz jako protezy. Muszą one jednak spełnić szereg wymagań: wykazywać biokompatybilność wszystkich elementów wchodzących w skład stopu, odpowiednie własności mechaniczne i zmęczeniowe, odporność na pełzanie oraz bardzo dobre własności antykorozyjne.
9
Content available Wpływ wielkości frakcji proszku amorficznego Fe60Co10Y8W1B20 na właściwości magnetyczne i mechaniczne kompozytu w osnowie polimerowej
Pietrusiewicz P., Nabiałek M., Dośpiał M., Bukowska A.
Przetwórstwo Tworzyw
|
2014
|
[R.] 20, nr 1 (157)
76--81
PL
W pracy badano wpływ wielkości frakcji amorficznego proszku wiązanego polimerem na właściwości magnetycznie miękkie i mechaniczne. Proszek został otrzymany poprzez niskoenergetyczne mielenie amorficznej płytki wytworzonej metodą wtłaczania ciekłego stopu do miedzianej formy. Na podstawie badań dyfrakcji promieni rentgenowskich stwierdzono, że kompozyty miały strukturę amorficzną. Wykorzystując magnetometr wibracyjny zmierzono statyczne pętle histerezy magnetycznej, na podstawie których wyznaczono parametry takie jak: magnetyzacja nasycenia (μoMs.) oraz pole koercji (Hc). Zmierzono mikrotwardość wykorzystując metodę Vickersa. Na podstawie przeprowadzonych badań stwierdzono, że wielkość amorficznych cząstek istotnie wpływa na zmianę parametrów magnetycznych jak i mechanicznych badanych kompozytów. Dodatkowo stwierdzono, że osnowa polimerowa izolująca amorficzne cząstki wpłynęła na pogorszenie parametrów magnetycznie miękkich w porównaniu do masywnych płytek.
EN
In the paper investigates the effect of the volume fraction of amorphous powders on the soft magnetic and mechanical properties. The powder was obtained by low-energy milling of amorphous plates produced by the injection of a liquid alloy into a copper mold. On the basis of X-ray diffraction, it was found that the composites had an amorphous structure. Using the vibrating sample magnetometer, the static hysteresis loops were measured, on which basis the basic magnetic parameters such as saturation magnetization (μoMs) and the coercive field (Hc) were determined. Microhardness was measured using the Vickers method. From the examinations, it was found that the size of the amorphous particles significantly influences the change of magnetic and mechanical parameters of the studied composites. Additionally it was found that the polymeric matrix insulating the amorphous particles affected the deterioration of soft magnetic parameters in comparison to the massive plates.
10
Content available remote Governing Differential Equations for the Mechanics of Undamageable Materials
Voyiadjis G. Z., Kattan P. I.
Engineering Transactions
|
2014
|
Vol. 62, iss. 3
241–-267
EN
In this work the mathematical foundations of the mechanics of elastic undamageable materials are presented. In particular the governing differential equations are derived for both the scalar and tensorial cases. In the isotropic case it is found that the resulting scalar differential equations are simple and easy to solve. However, in the anisotropic case the tensorial differential equations are complicated and unsolvable at this time. The current work presents the solution in the form of explicit nonlinear stress-strain relations for the simple one-dimensional case. However, the general solution of the three-dimensional case remains unattainable at the present time. Only the governing tensorial differential equations are derived for this latter case. It is to be noted that the term “undamageable” is reflected in the context of the material stiffness and not the property of indestructibility due to various loading conditions. Thus, the undamageable material reflects that no microcracks or microvoids occur as well as no plastic yielding in the material. To illustrate this concept, a last section is added on applications.
11
Content available The Structural Relaxation and its Influence on High Field Magnetization Processes
Pietrusiewicz P., Nabiałek M., Szota M., Dośpiał M., Błoch K., Bukowska A., Gruszka K.
Archives of Metallurgy and Materials
|
2014
|
Vol. 59, iss. 2
659--662
EN
In this paper the results of the structural and magnetic investigation of Fe61Co10Y8Zr1B20 alloy after solidification and isothermal annealing was presented. The isothermical annealing was carried out at 700 K for 1 h and 770 K for 3.5 h. For the structural investigation was performed by X-ray diffractometer equipped with a copper lamp. The results of (XRD) measurements showed the material in the state after the solidification and heat treatment is amorphous. Static hysteresis loops and initial magnetization curve was measured using vibrating magnetometer (VSM). The quality and quantity of structural defects in the sample after heat treatment was determined by indirect method using analyze the initial magnetization curve in accordance with the theory of Kronmüllera. These studies have shown that the annealing process has big influence to change significantly quantity of defects in amorphous structure as a result, there are changes of magnetic parameters such as saturation magnetization and field μ0Ms coercivity Hc.
PL
W pracy przedstawiono wyniki badań strukturalnych i magnetycznych stopu Fe61Co10Y8Zr1B20 w stanie po zestaleniu oraz po izotermicznym wygrzewaniu w temperaturze 700 K przez 1h i 770 K przez 3,5 h. Badania struktury wykonano przy użyciu dyfraktometru rentgenowskiego wyposażonego w lampę miedzianą. Wynik pomiarów (XRD) wykazał, że material w stanie po zestaleniu i obróbce termicznej jest amorficzny. Statyczne pętle histerezy i krzywą pierwotnego namagnesowania zmierzono za pomocą magnetometru wibracyjnego (VSM). Analizując krzywą pierwotnego namagnesowania i wykorzystując pośrednią metodę wyznaczania defektów strukturalnych zgodnie z teorią H. Kronmüllera wyznaczono jakość i ilość tych defektów w próbce w stanie po zestaleniu i po izotermicznym wygrzewaniu. Badania te wykazały że proces wygrzewania istotnie wypływa na zmiany zdefektowania struktury amorficznej w wyniku czego zachodzą zmiany parametrów magnetycznych takich jak magnetyzacja nasycenia μ0Ms i pole koercji Hc.
12
Content available Structure of the amorphous-crystalline Fe66Cu6B19Si5Nb4 alloy obtained by the melt-spinning process
Kozieł T., Latuch J., Zielińska-Lipiec A.
Archives of Metallurgy and Materials
|
2013
|
Vol. 58, iss. 2
601--605
EN
This paper presents structure investigations of the rapidly cooled Fe66Cu6B19Si5Nb4 alloy. A proper selection of chemical composition enabled in-situ formation of the amorphous-crystalline composite during the melt spinning process. Liquid phase separation into the Fe-rich and the Cu-rich phases was confirmed. The microstructures of alloy, melt-spun from 1723 and 1773 K, are composed of the Fe-rich amorphous matrix and Cu-rich spherical crystalline precipitates. For the higher melt-ejection temperature, no coarse precipitates could be observed. Amorphous nature of the Fe-rich matrix was confirmed by presence of a broad diffraction maximum on the X-ray diffraction patterns, a halo ring on the electron diffraction pattern as well as presence of exothermic effects, related to the crystallization of the Fe-rich amorphous matrix, in the differential scanning calorymetry. Beside presence of copper, revealing positive heat of mixing with iron, relatively large supercooled liquid region, was noticed.
PL
Praca przedstawia badania kompozytu amorficzno-krystalicznego otrzymanego w stopie Fe66Cu6B19Si5Nb4. Badania obejmowały rentgenowską analizę fazową (XRD), skaningową kalorymetrie różnicową (DSC), mikroskopię swietlną (LM), skaningową mikroskopię elektronową (SEM) i transmisyjną mikroskopię elektronową (TEM). Odpowiedni dobór składu chemicznego umożliwił uzyskanie kompozytu amorficzno-krystalicznego dzięki wykorzystaniu zjawiska podziału w stanie ciekłym w efekcie dodatniego ciepła tworzenia roztworu pomiędzy żelazem i miedzią. Mikrostruktury badanego stopu, po odlaniu z temperatury 1723 i 1773 K, składają się z amorficznej osnowy bogatej w żelazo i krystalicznych kulistych wydzieleń bogatych w miedź. Dla wyższej temperatury odlewania nie obserwowano dużych wydzieleń. Obecność fazy amorficznej została potwierdzona poprzez obecność halo na dyfrakcji elektronowej oraz efekt cieplny egzotermiczny w badaniach skaningowej kalorymetrii różnicowej, związany z krystalizacją osnowy bogatej w żelazo. Pomimo dodatku miedzi, wykazującej dodatnie ciepło tworzenia roztworu z żelazem, wyznaczony zakres cieczy przechłodzonej jest względnie duży.
13
Content available The Activation Energy of Primary Crystallization of Fe95Si5 Metallic Glass
Frączyk A.
Technical Sciences / University of Warmia and Mazury in Olsztyn
|
2011
|
nr 14(1)
93-100
EN
The primary crystallization process of Fe95Si5 metallic glass was investigated by DSC and X-ray diffraction methods. The crystalline phase α-Fe(Si) was identified during the primary crystallization process. The activation energy of crystallization Ea has been calculated in the frame of two models: Kissinger and Ozawa. The activation energy for primary crystallization of amorphous Fe95Si5 alloy are determined as 235.2 and 247.3 kJ mol-1 by means of the Kissinger and Ozawa equations, respectively.
PL
Proces krystalizacji pierwotnej szkła metalicznego Fe95Si5 badano metodą różnicowej kalorymetrii skaningowej (DSC) oraz dyfraktometrii rentgenowskiej. Zidentyfikowano fazę powstającą podczas pierwszego etapu krystalizacji jako α-Fe(Si). Obliczono energię aktywacji przemiany krystalicznej na podstawie dwóch modeli: Kissingera oraz Ozawy. Energia aktywacji obliczona z równań Kissingera i Ozawy wyniosła odpowiednio 235,2 oraz 247,3 kJ mol-1.
14
Content available remote Structure and soft magnetic properties of Fe72B20Si4Nb4 bulk metallic glasses
Nowosielski R., Babilas R., Griner S., Stokłosa Z.
Archives of Materials Science and Engineering
|
2009
|
Vol. 35, nr 1
13-20
EN
Purpose: The paper presents a microstructure characterization, thermal stability and soft magnetic properties analysis of Fe-based bulk amorphous materials. Design/methodology/approach: The studies were performed on Fe₇ ₂B₂ ₀Si₄Nb₄ glassy alloy in form of ribbons and rods. The amorphous structure of tested samples was examined by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) methods. The thermal properties of the glassy samples were measured using differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The magnetic properties were determined by the Maxwell-Wien bridge and VSM methods. Findings: The X-ray diffraction and transmission electron microscopy investigations have revealed that the studied as-cast bulk metallic glasses were amorphous. Broad diffraction halo can be seen for all tested samples, indicating the formation of a glassy phase with the diameters up to 2 mm. The fracture surface of rod samples appears to consist of small fracture zones, which leads to breaking of the samples into parts. A two stage crystallization process was observed for studied amorphous alloy. The changes of crystallization temperatures and magnetic properties as a function of glassy samples thickness were stated. Practical implications: The studied Fe-based alloy system has good glass-forming ability and thermal stability for casting bulk metallic glasses, which exhibit good soft magnetic properties, useful for many electric and magnetic applications. Originality/value: The obtained examination results confirm the utility of applied investigation methods in the microstructure, thermal and soft magnetic properties analysis of examined bulk amorphous alloys.
15
Content available remote Structural changes of Ni-base metallic glasses during thermal activation
Poloczek T., Griner S., Nowosielski R.
Archives of Materials Science and Engineering
|
2008
|
Vol. 31, nr 1
33-36
EN
Purpose: The paper presents a crystallization process of i68.7Cr6.6Fe2.65Si7.8B14C0.25 metallic glasses. The Ni68.7Cr6.6Fe2.65Si7.8B14C0.25 metallic glasses was produced by the CBMS method with cooling rate corresponding for amorphous structure manufacturing. Design/methodology/approach: The crystallization of Ni68.7Cr6.6Fe2.65Si7.8B14C0.25 metallic glasses by method internal friction (IF) differential thermal analysis (DTA), X-ray and transmission electron microscopy (TEM) were studied. Findings: The investigation showed, that metallic glasses during thermal activation go through from metastable amorphous state by few medial states to the stable crystalline state (relaxation and crystallization process). Research limitations/implications: During thermal activation of metallic glasses two processes can be distinguished: structural relaxation of amorphous structure and complex crystallization process of alloy. Practical implications: Perception of structural relaxation and crystallization processes of metallic glasses can used for analysis of thermal stability of metallic glasses. Originality/value: The paper presents, that the thermal activation of metallic glasses conduct to the structural changes, which the final stage is crystalline state.
16
Content available remote Modelowanie magnetycznych właściwości szkieł metalicznych
Szewczyk R.
Pomiary Automatyka Robotyka
|
2007
|
R. 11, nr 2
PL
W referacie przedstawiono wyniki modelowania charakterystyk magnetycznych szkła metalicznego o składzie chemicznym Fe40Ni38Mo4B18. Zastosowano model Jilesa-Athertona-Sablika, w którym parametry modelu wyznaczono z wykorzystaniem strategii ewolucyjnej (μ+λ) dla każdej pętli histerezy z osobna. Uzyskane wyniki wykazały przydatność modelu Jilesa-Athertona-Sablika do opisu tego typu materiałów. Uzyskany dla wszystkich pętli histerezy współczynnik korelacji Pearsona r2 przekracza 0,99, co jest w zupełności wystarczające przy wykorzystaniu modelu do zastosowań technicznych.
EN
Paper presents result of the modeling of magnetic characteristics of Fe40Ni38Mo4B18 metallic glass. Jiles-Atherton-Sablik model was applied. Parameters of the model were determined for each magnetic hysteresis loop. Results indicated, that used model is suitable for modeling of characteristics of metallic glasses. Achieved Pearson r2 coeficient exceeds 0,99 and is useful for technical applications.
17
Nanokrystaliczne materiały magnetyczne
Wilczyński W.
Nowa Elektrotechnika
|
2007
|
nr 3 (31)
3--7
18
Crystallization of amorphous Ni-Zr
Sulejmanovic S. D., Mihac T. P., Bikic S. I., Bajrovic N. A.
Archives of Materials Science
|
2007
|
Vol. 28, nr 1-4
160-163
EN
Ni-Zr amorphous alloys (metallic glasses) in the form of ribbon can be prepared in a wide range of concentration which strongly influences their physical properties. Many properties of the metallic glasses differ considerably from those of their crystalline counterparts. In contrast to their crystalline counterparts the resistivities of amorphous alloys are very high. Such high resistivities can be explained by the extra scattering on the random atomic arrangement. Crystallization is the final stage on annealing of metallic glasses. This process is irreversible and is accompanied by abrupt change in electrical resistivity. We have investigated temperature dependance of electrical resistance for different concentrations and for different heating rates. By measuring the electrical resistance the various stages of the crystallization process can be identified.
19
Content available remote Termostrukturna í časova stabilnílníst termometričnih parametrív metalevih amorfnih stopív
Âcišin S., Skoropad P., Lucik Â.
Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika
|
2006
|
z. 29 [233]
165-172
PL
W artykule przedstawiono wyniki badań stabilności termostrukturalnej i czasowej termometrycznych parametrów szkieł metalicznych i uzasadniono ich stosowanie do produkcji precyzyjnych elementów czułych termoprzetworników.
20
Content available remote Phase transitions in Co78Si9B13 and Fe78Si9B13 metallic glasses induced by isochronal annealing
Jakubczyk E.
Materials Science Poland
|
2006
|
Vol. 24, No. 4
1027--1036
EN
The crystallization process of Co78Si9B13 and Fe72Si9B13 metallic glasses was stimulated by isochronal annealing at various temperatures (573-823 K). By the DSC, X-ray diffraction, Hall and electrical resistivity measurements it was found that the crystallization proceeds through two main stages. At the first stage, alfa-Co and alfa-Fe phases are formed and at the second stage Co2B and Fe2B phases are crystallized. During the crystallization, the ferromagnetic ordering of both alloys is still conserved. Fe78Si 9B13 alloy has a much wider range of structural stability. The activation energy determined from DSC measurements and the total energy of the created phases obtained by quantum chemistry method confirmed the sequence and the type of the created phases. The creation of crystalline phases from the amorphous matrix was related to a distinct decrease of the electrical and Hall resistivities and the spontaneous Hall coefficient.
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