Juraj Olejňák

ORCID: 0000-0003-2723-3480
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About
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Research Areas
  • Magnesium Alloys: Properties and Applications
  • Aluminum Alloys Composites Properties
  • Metal and Thin Film Mechanics
  • Shape Memory Alloy Transformations
  • Nuclear Materials and Properties
  • Microstructure and mechanical properties
  • Hydrogen Storage and Materials
  • Piezoelectric Actuators and Control
  • Magnetic Properties and Applications
  • Aluminum Alloy Microstructure Properties
  • Intermetallics and Advanced Alloy Properties
  • Titanium Alloys Microstructure and Properties

Czech Technical University in Prague
2023-2024

Charles University
2018-2020

High mobility of twin boundaries in modulated martensites Ni-Mn-Ga-based ferromagnetic shape memory alloys holds a promise for unique magnetomechanical applications. This feature has not been fully understood so far, and particular it yet unveiled what makes the lattice mechanics Ni-Mn-Ga specifically different from other martensitic alloys. Here, results dedicated laser-ultrasonic measurements on hierarchically twinned five-layer (10 M) crystals fill this gap. Using combination transient...

10.1002/adma.202406672 preprint EN arXiv (Cornell University) 2024-07-21

The impact of precompression, thermal treatment and its combination on the deformation behaviour an extruded Mg–Zn–Ca (ZX10) alloy was studied with respect to a varied average grain size. Hall–Petch plot used highlight in wide size interval. initial texture wrought characterized by X-ray diffraction. Moreover, evolution microstructure provided electron backscatter diffraction (EBSD) technique. obtained results indicate strong contribution deformation-thermal resulting behaviour....

10.3390/ma13020351 article EN Materials 2020-01-12

Abstract High mobility of twin boundaries in modulated martensites Ni–Mn–Ga‐based ferromagnetic shape memory alloys holds a promise for unique magnetomechanical applications. This feature has not been fully understood so far, and particular, it yet unveiled what makes the lattice mechanics Ni–Mn–Ga specifically different from other martensitic alloys. Here, results dedicated laser‐ultrasonic measurements on hierarchically twinned five‐layer (10M) crystals fill this gap. Using combination...

10.1002/adma.202406672 article EN cc-by Advanced Materials 2024-08-12

Elastic constants of dual-phase β-titanium alloys with different phase compositions and volume fractions individual phases were investigated using resonant ultrasound spectroscopy transient grating spectroscopy. It was shown that even for high the secondary (ω α), crystals can retain cubic symmetry homogeneity in their elastic behavior, both at macro-scale micro-scale, unless precipitate under external stress violating this symmetry. In contrast, a material heat-treated uniaxial compression...

10.1016/j.matdes.2023.112474 article EN cc-by-nc-nd Materials & Design 2023-11-14
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