Phase Transformations in Austenitic Steels and Their Monitoring through Barkhausen Noise

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The lecture presents research in the field of Barkhausen noise in austenitic steels, where martensite is formed through deformation processes. This phase transformation is also associated with the transition from a paramagnetic phase to a ferromagnetic one. Regarding plastic deformation, processes such as simple tension, dynamic strengthening of materials, rolling, friction, as well as long-term combined loading of a ship propeller are presented. The presentation highlights the importance of exchange interaction between individual martensitic regions, as well as the dominant influence of the amount of deformation-induced martensite on Barkhausen noise.

Information about the event

  • Typ

    Specialized lecture and seminar

  • Date

    March 2025

  • Place

    Ústav Experimentálnej Fyziky SAV, v.v.i., Košice

  • Lecturer

    prof. Ing. Miroslav Neslušan, PhD.

Study of the Structure of Chemically Gradient Thin Films

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Thin films prepared with a compositional gradient represent a materials library suitable for studying structure formation and measuring material properties across a wide range of chemical compositions. The motivation for obtaining the structural composition of the materials library is the applicability of the thin film on a polyimide substrate for flexible electronics. Structural analysis was carried out using photon diffraction in transmission mode at the synchrotron radiation source on beamline ID-22 at ESRF, with micro-focusing of the beam to 0.5 x 0.5 mm² to ensure local characterization.

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The Path to Direct Measurement of the Magnetocaloric Effect in Microscopic Samples

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Most research on magnetocaloric materials is based on the principle of indirect calculations from magnetic measurements. However, these do not allow for the determination of many practically significant properties, such as the rate of heat transfer. The experimentally non-trivial method of direct measurement of the magnetocaloric effect opens up new possibilities for the evaluation of magnetocaloric materials and provides information on key properties essential for their practical application.

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Competition for the Štefan Jedlík Award for the best thesis in the academic year 2024/2025 in the field of applied magnetism and magnetic materials

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The Slovak Magnetic Society of the Association of Slovak Scientific and Technical Societies announces a nationwide competition for the Štefan Jedlík Award for the best thesis in the field of applied magnetism and magnetic materials. Students from all universities and higher education institutions in the Slovak Republic who successfully defended their final thesis (bachelor’s, master’s, or doctoral) in the academic year 2024/2025, addressing topics related to magnetism, magnetic properties of substances, and their applications, are eligible to participate in the competition.

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