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Influence of annealing conditions on changes of the structure and selected properties of Al88Y7Fe5 and Al88Y6Fe6 alloys

Babilas Rafał, Spilka Monika, Łoński Wojciech, Radoń Adrian, Kądziołka-Gaweł Mariola, Gębara Piotr

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 2

art. no. e144614

EN

Al-Y-Fe amorphous and nanocrystalline alloys are characterized by a unique collection of diverse properties that are influenced by various factors, including heat treatment. In this paper, the effect of heat treatment on the structural changes and selected properties of Al-Y-Fe metallic glasses in the as-spun state is investigated. The structure of the Al88Y7Fe5 and Al88Y6Fe6 alloys was examined by X-ray diffraction (XRD) and Mössbauer spectroscopy (MS). The corrosion resistance of the samples was characterized using polarization tests in a 3.5% NaCl solution at 25 °C. The effect of sodium chloride on the surface was studied with scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The magnetic properties of Al-based alloys were explored using a vibrating sample magnetometer (VSM). It was revealed that the tested alloys show better properties after annealing than in the as-spun state. The annealing of the Al88Y7Fe5 and Al88Y6Fe6 alloys in the temperature range of 200 to 300 °C improved the magnetic properties and corrosion resistance of these materials. After 3,600 s, the better EOCP values were recorded for the Al88Y6Fe6 and Al88Y7Fe5 alloys after annealing at 300 °C and 200 °C, adequately. On the basis of the polarization tests, it was concluded that the electrochemical properties are better for Al88Y6Fe6 alloys after annealing at 300 °C.

2

Structural Studies (FTIR, XRD) of Sodium Carboxymethyl Cellulose Modified Bentonite

Cukrowicz S., Grabowski B., Kaczmarska K., Bobrowski A., Sitarz M., Tyliszczak B.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 3

119--125

EN

The study investigates the effect of the organic compound representing the cellulose derivative - sodium salt of carboxymethyl cellulose (CMC/Na) on the structure of the main component of bentonite (B) - montmorillonite (MMT). Structural analysis revealed that the CMC/Na of different viscosity interacts with the mineral only via surface adsorption, causing at the same time partial or full delamination of its layered structure. This was confirmed by the XRD diffraction tests. Such polymer destructive influence on the structure of the modified main component of the bentonite limits the use of its composites as an independent binder in moulding sand technology, but does not exclude it from acting as an additive being a lustrous carbon carrier. According to the IR spectra of the B/CMC/Na materials, it can be stated that the interaction between the organic and inorganic parts is based on the formation of hydrogen bonds. That kind of the interpretation applies especially to the MMT modified in the bentonite with a lower viscosity polymer. The characteristics of the main IR absorption bands for composites with a higher viscosity polymer indicates the formation of less stable structures suggesting the random nature of the hydrogen bonds formation.

3

Maintenance of airfield pavements made of cement concrete with respect to their durability

Linek M., Nita P.

Journal of KONES

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2016

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Vol. 23, No. 1

215--221

EN

The issue of concrete airfield pavements maintenance is the process, the efficient performance of which may provide suitable life and air traffic safety related to thereof. Obtaining durable airfield pavement is a result of team cooperation in the following fields: suitable design solutions, applicable work technology and principles of arrangement thereof. However, fundamental link of this process is the high level of engineering culture related to construction maintenance during its whole "lifespan". Each pavement must comply with requirements according to principles of "construction limit states" method expressing work safety, i.e. limit state of deformation and serviceability. Thereby, the "weakest link" within the chain of projects and actions implemented in the course of its construction process decides about safety and lifespan of pavement operation. Durability of such engineering constructions as airfield pavements, is specified by the quantity of performed "flight operations" on these pavements, within the assumed operation period. Considering, among others, principles of limit state method, the required and anticipated pavement operation period can be specified. Life aspect with reference to airfield pavements can be analysed in theory by means of application of modern material solutions. The above-mentioned aspects will be described widely in this work. Modern material solutions include modified composition of concrete intended for construction of particularly difficult sections of such pavements and structural tests were conducted for such composition, which would confirm suitability of assumed material solutions.

4

Badania ścieralności koksu w aspekcie jego przydatności dla procesu wielkopiecowego

Konstanciak A.

Hutnik, Wiadomości Hutnicze

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2009

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Vol. 76, nr 7

451-454

PL

Omówiono zachowanie się koksu w wielkim piecu. Porównano dwie wybrane metody oceny ścieralności koksu wielkopiecowego. Przedstawiono wyniki badań strukturalnych trzech rodzajów koksów oraz przedstawiono wstępne badania porowatości koksu namiarowego. Wskazano na przydatność metody termościeralności do oceny jakości koksu wielkopiecowego.

EN

The behaviour of coke in the blast furnace was discused. Two selected methods of asessment of abrasion of blast-furnaces coke was compared. The results of structural tests for three type of coke and initial test of porosity of burden coke were presented. The usefulness of thermoabrasion method for evaluation of quality of blast-furnace coke was pointed out.

5

Wpływ rozkładu temperatury wyprasek na ich strukturę

Postawa P.

Przetwórstwo Tworzyw

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2005

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[R.] 11, nr 4

104-110

PL

W artykule przedstawiono wyniki badań termowizyjnych oraz strukturalnych wyprasek wtryskowych wytworzonych z poliacetalu. Zwrócono w nim uwagę na niedoskonałości przetwórstwa tworzyw polimerowych, głównie na problem nierównomiernego rozkładu temperatury formy i związaną z tym niejednorodność struktury i właściwości poszczególnych obszarów wyprasek wtryskowych. Do badań wykorzystano technikę termowizyjną oraz różnicową kalorymetrię skaningową DSC.

EN

The results of thermovision and structural tests of polyacetal injection mouldings were presented in the article. Imperfection of plastics processing, especially unequal distribution of mould temperature and related to the above heterogeneity of structure as well as properties of particular areas of injection mouldings was observed. Thermovision technique and differential scanning calorimetry (DSC) were applied for testing.

6

S690QL - krajowa stal klasy N-A-XTRA

Stankiewicz M., Prószyński M.

Inżynieria i Aparatura Chemiczna

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2003

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Nr 5

23-28

PL

W artykule przedstawiono wyniki badań fizykomechanicznych i strukturalnych stali S690QL, które wskazują na możliwość stosowania tej stali w wyższych temperaturach eksploatacji niż wynika to z zaleceń normy PN—EN 10137:2000. Jednocześnie wskazano na niedociągnięcia technologiczne w procesie wytwarzania skutkujące niedostateczną jednorodnością materiału.

EN

The results of physico-mechanical and structural tests carried out for the S690QL steel are presented in the paper. The tests indicated that this steel could be used in higher exploitation temperatures than recommended in the PN-EN 10137:2000 standard. Technical imperfections in production leading to material inhomogeneity are also shown.