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Microstructure and physical properties of nanocrystalline Fe75B10Si10Cr5 alloy

Baran Dominika, Czyzewska Natalia, Dziuba Szymon, Przenajkowska Julia, Piesiak Mateusz, Hasiak Mariusz

Interdisciplinary Journal of Engineering Sciences

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2019

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Vol. 7, no. 1

17--22

EN

The main of this paper is to study the microstructure and physical properties of the Fe75B10Si10Cr5 in condition after being produced. The sample was prepared as cylindrical rod with a diameter of 3 mm. The rod was produced using the arc melting method with a suction casting option. It was found that produced alloy was nanocrystalline with average grains of about 15 nm. Due to the different cooling rates in the inner and outer part of the rod, variable sizes of dendrites in the material were observed. The presence of the dendrites was also confirmed on the surface by AFM investigations. The average roughness calculated for chosen profile of the examined area was 6 nm and average hardness of the material equals 844 HV. The mechanical properties were determined in respect to the Oliver-Pharr method. Young’s modulus of the Fe75B10Si10Cr5 calculated from load-displacement curve equals 128 GPa. Magnetic properties of the sample were measured by the vibrating sample magnetometer. The coercivity was equaled 2.184 kA/m, which is relatively low. It means that the Fe75B10Si10Cr5 alloy is magnetically soft.

2

Effect of Zr Purity and Oxygen Content on the Structure and Mechanical Properties of Melt-Spun and Suction-Cast Cu46Zr42Al7Y5 Alloy

Kozieł T., Latuch J., Cios G., Bała P.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 2B

1215--1219

EN

The effect of oxygen content in zirconium on the structure and mechanical properties of the Cu46Zr42Al7Y5 alloy, in the form of melt-spun ribbons and suction-cast rods, was investigated. Two types of Zr, rod and crystal bar of different nominal purities and oxygen contents, were used to synthesize the alloy by arc melting. Rapidly solidified ribbons were produced by melt spinning and their amorphous structures were confirmed by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Bulk samples in the form of rods were cast using a special water-cooled suction casting unit attached to the arc melting system. XRD and DSC studies proved the amorphous structure of the bulk alloy synthesized from low-oxygen Zr and partial crystallization of the same alloy for high-oxygen Zr. In both bulk samples, uniformly distributed crystalline particles were identified as yttrium oxides. Higher mean compressive strength of amorphous alloy was observed. The hardness of amorphous phase was close to 500 HV1 in both bulk alloys, while the hardness of crystalline dendritic areas, observed in the alloy synthesized from high oxygen Zr, was lower by about 50 HV1.

3

Estimation Of Cooling Rates In Suction Casting And Copper-Mould Casting Processes

Kozieł T.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 2A

767--771

EN

The cooling rates associated with suction and copper-mould casting of ø2, ø3 and ø5 mm rods made in Fe-25wt%Ni and Al-33wt%Cu alloys were determined based on their cellular and lamellar spacings, respectively. The work showed that the temperature profile in cylindrical samples can not be determined merely by microstructural examination of eutectic sample alloys. A concave solidification front, as a result of eutectic transformation, caused decrease of a lamellar spacing while approaching to the rod centre. The minimum axial cooling rates, estimated based on the cellular spacing in the Fe-25wt%Ni alloy, were evaluated to be about 200 K/s for both ø2 and ø3 mm and only 30 K/s for the ø5 mm suction cast rods. The corresponding values were slightly lower for the copper-mould cast rods.

PL

Na podstawie analizy wielkości dendrytów komórkowych w stopie Fe-25Ni i odległości międzypłytkowych w stopie Al-33Cu zostały oszacowane szybkości chłodzenia w trakcie odlewania stopów metodami suction casting i copper-mould casting. Badania wykazały, że rozkład szybkości chłodzenia w cylindrycznych próbkach nie może być oszacowany w stopach z krystalizacją eutektyczną. W tym przypadku bowiem dochodzi do zmniejszania odległości międzypłytkowej w miarę zbliżania się do osi pręta, ze względu na wklęsły charakter frontu krystalizacji. Minimalna szybkość chłodzenia w osi prętów odlanych za pomocą metody suction casting, wyznaczona w oparciu o pomiary wielkości dendrytów komórkowych w stopie Fe-25wt%Ni, wyniosła ok. 200 K/s dla stopów o średnicy ø2 i ø3 mm, i tylko 30 K/s dla stopów o średnicy ø5 mm. W przypadku stopów odlanych metodą copper-mould casting oszacowane wartości były nieznacznie mniejsze.

4

Nowe technologie wytwarzania materiałów magnetycznych

Wysłocki J. J., Pawlik P.

Hutnik, Wiadomości Hutnicze

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2006

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Vol. 73, nr 6

280-284

PL

Przedstawiono dwie nowe technologie wytwarzania materiałów magnetycznych: łukowo-plazmowe nanoszenie proszków oraz zasysanie roztopionego łukowo stopu do chłodzonej wodą formy (suction-casting). Zbadano magnetyczne i strukturalne właściwości cienkich warstw Nd-Fe-B nanoszonych plazmowo na podłoże miedziane o różnej temperaturze. Ponadto pokazano, że metoda suction-casting pozwala na uzyskiwanie zarówno amorfcznych materiałów magnetycznie miękkich (np. Fe-Co-W-Zr-B), jak i nano-kompozytów magnetycznie twardych, np. (Fe-Co)-(Pr-Dy)-B-Zr.

EN

New two technologies of the magnetic materials manufacturing are presented: arc-plasma spraying and suction casting. Thin Nd-Fe-B flms prepared by arc-plasma spraying at different substrate temperatures were investigated for their magnetic and structural properties. Moreover, it is shown that the suction-casting method is suitable for manufacturing of magnetically soft amorphous materials (e.g. Fe-Co-W-Zr-B) as well as hard nanocomposites, e.g. (Fe-Co)-(Pr-Dy)-B-Zr.