Wyniki wyszukiwania - BazTech

1

Structure and physical properties of Fe59Mn27Ni7Cr3Si4 shape memory alloy

Lipiński Piotr, Kowalik Dawid, Kowalski Tomasz, Królicki Michał, Hasiak Mariusz

Interdisciplinary Journal of Engineering Sciences

|

2019

|

Vol. 7, no. 1

10--16

EN

In this work the authors present the properties of the Fe59Mn27Ni7Cr3Si4 (at. %) shape memory alloy. Two different phases were discovered during the XRD analysis and Fe-Mn phase was identified. The hardness of the investigated material in the as-cast state was 194 HV. The nano hardness was 511 HV and Young modulus was determined as 159 GPa. AFM and LFM tests allowed to observe linear arrangement of one phase formed as multiple irregular separations. Shape memory effect was not observed in the temperature range 22 – 600oC.

2

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

|

2019

|

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.

3

Experimental study of Fe-Ni-Ti-Cr system

Hoppe Viktoria, Gibas Anna, Grzegorczyk Weronika, Małecki Marcin, Hasiak Mariusz

Interdisciplinary Journal of Engineering Sciences

|

2019

|

Vol. 7, no. 1

1--14

EN

The research comprises a discussion about a formation of intermetallic phase with stoichiometric composition Fe2Ti, called Laves phase, and influence of chromium on the whole structure containing this phase by means of comparison of the two alloys. A base Fe35Ni35Ti30 alloy was used as a reference and then compared with a Fe-Ni-Ti chromium doped - Fe30Ni35Ti30Cr5 alloy. The study of microstructure performed with scanning electron microscope enabled to distinguish different phases. These regions are rich in mixture of Fe-Ni and Ti-Ni elements. The identified phases are Fe2Ti and Ni3Ti which was confirmed by X-ray diffraction and simultaneously it is consistent with energy dispersive spectroscopy results. Differential scanning calorimetry confirmed also multi-phase composition. As a result different hardness was measured for these phases using nanoindentation. The overall hardness was established using the Vickers method.