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Analysis of amorphous regions in severely marformed NiTi shape memory alloy

  • Paweł Świec , Maciej Zubko , Danuta Stróż and Zdzisław Lekston
Published/Copyright: January 11, 2019
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 110 Issue 1

Abstract

In this work Ni-rich NiTi alloy subjected to 35 % cold-rolling in the martensitic state followed by annealing at 450 °C for 15 min has been studied by transmission electron microscopy observations. It has been found that the material after thermo-mechanical treatment has a non-uniform nanostructure with canal-like shaped amorphous areas containing crystallites of R and B19′ phases. Zones surrounding these regions contain grains elongated in different directions in different areas. They are identified to be a mixture of B2 parent, R rhombohedral and B19′ martensitic phases. Selected area electron diffraction as well as transmission electron microscope orientation maps taken from these zones exhibit differences in their crystallographic orientations. It is proposed that the amorphous areas form along grain boundaries during severe plastic deformation.

Keywords: Nanostructure; NiTi alloys; Shape memory; Severe plastic deformation; TEM orientation mapping with electron beam precession
*Correspondence address, Dr. Maciej Zubko, Institute of Material Science, University of Silesia, 1a 75 Pułku Piechoty Street, Chorzów 41-500, Poland, Tel.: +48 32 3497 509, E-mail: , Web: http://www.inom.us.edu.pl

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Received: 2017-11-15
Accepted: 2018-01-15
Published Online: 2019-01-11
Published in Print: 2019-01-09

© 2019, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111639
Keywords for this article
Nanostructure; NiTi alloys; Shape memory; Severe plastic deformation; TEM orientation mapping with electron beam precession

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. XVI International Conference on Electron Microscopy
  5. Original Contributions
  6. Application of analytical electron microscopy and FIB-SEM tomographic technique for phase analysis in as-cast Allvac 718Plus superalloy
  7. Microstructure and properties of laser interference crystallized amorphous FeSiB ribbon
  8. Analysis of amorphous regions in severely marformed NiTi shape memory alloy
  9. Structure of MgLiAl alloys after various routes of severe plastic deformation studied by TEM
  10. Microstructure and selected mechanical and electrical property analysis of Sr-doped LaCoO3 perovskite thin films deposited by the PLD technique
  11. Microstructure of an oxide scale formed on ATI 718Plus superalloy during oxidation at 850 °C characterised using analytical electron microscopy
  12. Effect of powder morphology on the microstructure and properties of cold sprayed Ni coatings
  13. Microstructure of Ti/Al multilayer foils ignited with electric current
  14. Evolution of γ′ morphology and γ/γ′ lattice parameter misfit in a nickel-based superalloy during non-equilibrium cooling
  15. Effect of heat treatment on the precipitation hardening in FeNiCoAlTaB shape memory alloys
  16. The structure and formation mechanism of FeS2/Fe3S4/S8 nanocomposite synthesized using spherical shaped Fe3O4 nanoparticles as the precursor
  17. Short Communications
  18. Characterization of Inconel 625 surface layer modified by laser shock processing
  19. DGM News
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