A5034245650- Shape Memory Alloy Transformations
- Titanium Alloys Microstructure and Properties
- Ferroelectric and Piezoelectric Materials
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Magnetic and transport properties of perovskites and related materials
- Advanced Materials and Mechanics
- Microstructure and Mechanical Properties of Steels
- Topology Optimization in Engineering
- Intermetallics and Advanced Alloy Properties
- Aeroelasticity and Vibration Control
- Elasticity and Wave Propagation
- Structural Engineering and Vibration Analysis
- Magnetic Properties and Applications
- Optical measurement and interference techniques
- Elasticity and Material Modeling
- Corrosion Behavior and Inhibition
- Structural Analysis and Optimization
- Ultrasonics and Acoustic Wave Propagation
- Advanced Sensor and Energy Harvesting Materials
- Thermography and Photoacoustic Techniques
- Polymer Nanocomposites and Properties
- Bladed Disk Vibration Dynamics
- Metallic Glasses and Amorphous Alloys
- MXene and MAX Phase Materials
Czech Academy of Sciences, Institute of Physics
2015-2024
Czech Academy of Sciences
2015-2024
Czech Academy of Sciences, Nuclear Physics Institute
2018-2021
Czech Academy of Sciences, Institute of Physics of Materials
2014-2021
Nuclear Research Institute Rez (Czechia)
2019-2021
Institute of Physics of the Slovak Academy of Sciences
2016-2017
Czech Academy of Sciences, Institute of Plasma Physics
2008-2015
Czech Academy of Sciences, Institute of Thermomechanics
2007-2013
Czech Technical University in Prague
2009
Franche-Comté Électronique Mécanique Thermique et Optique - Sciences et Technologies
2005-2006
The stress-induced martensitic transformation in tensioned nickel-titanium shape-memory alloys proceeds by propagation of macroscopic fronts localized deformation. We used three-dimensional synchrotron x-ray diffraction to image at micrometer-scale resolution the grain-resolved elastic strains and stresses austenite around one such front a prestrained wire. found that local grains are modified ahead nose cone-shaped buried interface where begins. Elevated shear cone explain why manner....
Tensile deformation of nanocrystalline superelastic NiTi wire in the martensite state at -90 °C until fracture was investigated by in-situ synchrotron X-ray diffraction texture analysis. The results were interpreted terms activity various transformation and twinning modes. strain components into load axis as well discontinuous rotations crystal lattice due to activation modes calculated using an abstraction "ideal <hkl> fibre textured polycrystal" used estimate evolution during tensile test....
The cubic B2 to monoclinic B19' martensitic transformation in NiTi shape memory alloys proceeds by the nucleation and propagation of habit plane interfaces that remain undistorted unrotated during transformation. Due incompatibility austenite martensite lattices NiTi, are assumed form between twinned as described Phenomenological Theory Martensite Crystallography (PTMC). This view is currently widely spread literature spite fact it contradicts experimental observations single lattice TEM...
Superelastic NiTi wires were prepared from a single cold worked wire by various electropulse heat treatments. The having wide range of virgin microstructures subjected to tensile tests until rupture and cyclic superelastic testing in temperature range. results complemented TEM observation lattice defects created cycling. It appeared that the yield stress depends significantly on microstructure less test temperature. upper plateau varies with through its effect Ms increases increasing accord...
Superelastic NiTi wires possessing wide range of microstructures were deformed in tensile tests up to the end stress plateau a temperature −20 – 200 °C, unloaded and free heated ~200 °C. The recoverability upper strains was evaluated dependence on test wire microstructure. At low temperatures below 20 are fully recoverable upon unloading heating. With increasing temperature, however, becomes gradually lost. Unusually long plateaus (10–17%) observed at temperatures, which approached yield for...
Abstract Deformation mechanisms activated during tensile deformation of nanocrystalline NiTi wire in martensite state were investigated by combination two experimental methods: (i) analysis the evolution martensite-variant microstructures grains deformed TEM and (ii) texture situ synchrotron X-ray diffraction. The obtained results are linked to activity various twinning processes martensite. It is concluded that reorientation proceeds via motion interdomain interfaces, gives rise reoriented...
Although superelastic NiTi shape memory alloy wire displays very high resistance to plastic deformation in austenite and martensite phases, incremental strains are recorded whenever the cubic monoclinic martensitic transformation (MT) proceeds under external stress leading functional fatigue degradation. Therefore, special closed-loop thermomechanical loading tests were performed shed light on mechanism by which strain generated. These revealed that both forward reverse MTs occurring above...
An analysis of the shape memory effect a NiTi alloy by using spark plasma sintering approach has been carried out. Spark Ti50Ni50 powder (20–63 µm) at temperature 900 °C produced specimens showing good effects. However, sample showed 2.5% porosity due to load 48 MPa. Furthermore, an apparent was recorded and were characterized uniformity in chemical composition alloys significant austenite phases with bending strain recovery >2.5%.