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1

Martensite Reorientation after Thermal Cycling in NiTiCu Shape Memory Alloys Studied by EBSD Technique

100%

Rak J., Goryczka T., Ochin P.

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2016

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vol. 130

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issue 4

1075-1078

EN

The Ni₂₅Ti₅₀Cu₂₅ shape memory alloy exhibits one-step martensitic transformation. Transformation occurs between the B2 parent phase and the B19 orthorhombic martensite. The course of the martensitic transformation was in situ studied in the alloy with use of electron backscatter diffraction. During heating, reverse martensitic transformation occurs from the B19 orthorhombic martensite to the B2 parent phase. On cooling, from the parent phase the B19 martensite is formed. Obtained results proved that the B19 martensitic plates forms the variants indexed as 1, 3, and 5. Thermal cycling does not change the crystallographic correlation between the parent phase and the martensite. However, after cycling, different rearrangement of the martensitic plates can be received. In consequence, characteristic temperatures of the martensitic transformation are shifted.

2

Precession Electron Diffraction Studies of SrₓBa_{1-x}Nb₂O₆ and CaₓBa_{1-x}Nb₂O₆ Single Crystals

88%

Wspaniała-Rak J., Zubko M., Stróż D., Rak J., Dec J.

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2016

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vol. 130

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issue 4

830-832

EN

Crystal structures of two single crystals SrₓBa_{1-x}Nb₂O₆ and CaₓBa_{1-x}Nb₂O₆ have been reinvestigated using automated electron diffraction tomography method with beam precession. 3D reciprocal space has been reconstructed based on recorded tilt series. For both samples the crystal structure was refined and the tetragonal symmetry with space group P4bm was confirmed. The three dimensional reciprocal space allowed to observe and to study satellite reflections in both materials.

3

Phase Analysis of NiTi Shape Memory Wires and Computer Simulations of the Superelastic Effect

88%

Młocek B., Lekston Z., Zubko M., Rak J., Stróż K.

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2016

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vol. 130

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issue 4

1063-1065

EN

Shape memory alloys belong to the group of intelligent materials due to their exceptional properties related to reversible martensitic transformation. They show both superelasticity and shape memory effects. The modelling of the superelastic phenomena occurring in NiTi alloys is important due to its application in the further development of materials for dedicated applications. A computer simulation of static tensile test was carried out using the finite element method for NiTi wire and obtained results were compared with experimental curve. For the determination of phase composition at ambient temperature and courses of phase transitions during cooling and heating the X-ray powder diffraction and differential scanning calorimetry methods were used. X-ray diffraction phase analysis exhibited that the studied wire at room temperature has B2 - parent phase structure. Additionally, differential scanning calorimetry measurements showed that the phase transformations during cooling and heating occur in a temperature range of about -20 to +30°C.

4

The Influence of Passivation Type on Corrosion Resistance of Ti15Mo Alloy in Simulated Body Fluids / Wpływ Rodzaju Pasywacji Powierzchni Stopu Ti15Mo Na Jego Odporność Korozyjną W Środowisku Płynów Ustrojowych

88%

Dercz G., Łosiewicz B., Szklarska M., Rak J., Simka W.

Archives of Metallurgy and Materials

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2015

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issue 4

5

Effect of Creep on Crystallographic Orientation in Single Crystal Superalloy

76%

Albrecht R., Rak J., Bogdanowicz W., Gancarczyk K., Sieniawski J., Kubiak K., Lelątko J.

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2016

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vol. 130

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issue 4

1094-1096

EN

The creep-rupture tests were performed on a single crystal rods made of CMSX-4 superalloy obtained at withdrawal rates of 3 and 5 mm/min. After the rupture the microstructure and fracture surface were examined and correlated with X-ray crystal rotation measurements by the Ω-scan method. The conclusions about the crystal lattice rotation during creep test were provided.

6

Ultra-Fast Current Aided Sintering of High Coercive Magnetic Powders and Composites

76%

Granek K., Ziółkowski G., Chrobak A., Klimontko J., Rak J., Zivotsky O., Gembalova L.

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issue 2

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4 Acta Physica Polonica A

2 Archives of Metallurgy and Materials

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6 Rak J.

2 Zubko M.

1 Albrecht R.

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1 Chrobak A.

1 Dec J.

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1 Goryczka T.

1 Granek K.

1 Klimontko J.

1 Kubiak K.

1 Lekston Z.

1 Lelątko J.

1 Młocek B.

1 Ochin P.

1 Sieniawski J.

1 Simka W.

1 Stróż D.

1 Stróż K.

1 Szklarska M.

1 Wspaniała-Rak J.

1 Zivotsky O.

1 Ziółkowski G.

1 Łosiewicz B.

Martensite Reorientation after Thermal Cycling in NiTiCu Shape Memory Alloys Studied by EBSD Technique

Precession Electron Diffraction Studies of SrₓBa_{1-x}Nb₂O₆ and CaₓBa_{1-x}Nb₂O₆ Single Crystals

Phase Analysis of NiTi Shape Memory Wires and Computer Simulations of the Superelastic Effect

The Influence of Passivation Type on Corrosion Resistance of Ti15Mo Alloy in Simulated Body Fluids / Wpływ Rodzaju Pasywacji Powierzchni Stopu Ti15Mo Na Jego Odporność Korozyjną W Środowisku Płynów Ustrojowych

Effect of Creep on Crystallographic Orientation in Single Crystal Superalloy

Ultra-Fast Current Aided Sintering of High Coercive Magnetic Powders and Composites