Structure and Properties of NiTi Shape Memory Alloy after Cold Rolling in Martensitic State

• Authors: P. Świec , M. Zubko , Z. Lekston , D. Stróż
• Languages of publication: EN

Abstracts

EN

Due to unique features, like shape memory effects and superelasticity, NiTi alloys with nearly equiatomic composition are used in various branches of industry. Application of severe plastic deformation can drastically change properties of the materials. In the present paper the Ni_{50.4}Ti_{49.6} alloy after cold rolling in the martensitic state and further annealed is studied. Phase transformations were studied using X-ray diffraction and differential scanning calorimetry measurements. Microstructure was examined using transmission electron microscopy and electron backscattering diffraction methods. Mechanical properties of obtained alloys has been studied using Vickers microhardness tests. Based on the performed measurements it can be seen that in studied alloys two steps B2 ↔ R ↔ B19' phase transitions occurred. Performed plastic deformation influences course of phase transitions and phases composition. Due to the reduction of grain size microhardness of the studied material is increasing with increase of deformation degree.

Keywords

EN

81.30.Kf; 81.40.Ef; 62.20.fg

Discipline

• 81.40.Ef: Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
• 62.20.fg: Shape-memory effect; yield stress; superelasticity
• 81.30.Kf: Martensitic transformations

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 130
• Issue: 4
• Pages: 1081-1084

Dates

published

2016-10

Contributors

author

P. Świec

• Institute of Materials Science, University of Silesia, Chorzów, Poland

author

M. Zubko

• Institute of Materials Science, University of Silesia, Chorzów, Poland

author

Z. Lekston

• Institute of Materials Science, University of Silesia, Chorzów, Poland

author

D. Stróż

• Institute of Materials Science, University of Silesia, Chorzów, Poland

References

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• [6] H. Morawiec, J. Ilczuk, D. Stróż, T. Goryczka, D. Chrobak, J. Phys. IV 7, C5-155 (1997), doi: 10.1051/jp4:1997524

Identifiers

DOI

10.12693/APhysPolA.130.1081