Analysis of amorphous regions in severely marformed NiTi shape memory alloy
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Paweł Świec
, Maciej Zubko , Danuta Stróż und Zdzisław Lekston
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.
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© 2019, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- XVI International Conference on Electron Microscopy
- Original Contributions
- Application of analytical electron microscopy and FIB-SEM tomographic technique for phase analysis in as-cast Allvac 718Plus superalloy
- Microstructure and properties of laser interference crystallized amorphous FeSiB ribbon
- Analysis of amorphous regions in severely marformed NiTi shape memory alloy
- Structure of MgLiAl alloys after various routes of severe plastic deformation studied by TEM
- Microstructure and selected mechanical and electrical property analysis of Sr-doped LaCoO3 perovskite thin films deposited by the PLD technique
- Microstructure of an oxide scale formed on ATI 718Plus superalloy during oxidation at 850 °C characterised using analytical electron microscopy
- Effect of powder morphology on the microstructure and properties of cold sprayed Ni coatings
- Microstructure of Ti/Al multilayer foils ignited with electric current
- Evolution of γ′ morphology and γ/γ′ lattice parameter misfit in a nickel-based superalloy during non-equilibrium cooling
- Effect of heat treatment on the precipitation hardening in FeNiCoAlTaB shape memory alloys
- The structure and formation mechanism of FeS2/Fe3S4/S8 nanocomposite synthesized using spherical shaped Fe3O4 nanoparticles as the precursor
- Short Communications
- Characterization of Inconel 625 surface layer modified by laser shock processing
- DGM News
- DGM News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- XVI International Conference on Electron Microscopy
- Original Contributions
- Application of analytical electron microscopy and FIB-SEM tomographic technique for phase analysis in as-cast Allvac 718Plus superalloy
- Microstructure and properties of laser interference crystallized amorphous FeSiB ribbon
- Analysis of amorphous regions in severely marformed NiTi shape memory alloy
- Structure of MgLiAl alloys after various routes of severe plastic deformation studied by TEM
- Microstructure and selected mechanical and electrical property analysis of Sr-doped LaCoO3 perovskite thin films deposited by the PLD technique
- Microstructure of an oxide scale formed on ATI 718Plus superalloy during oxidation at 850 °C characterised using analytical electron microscopy
- Effect of powder morphology on the microstructure and properties of cold sprayed Ni coatings
- Microstructure of Ti/Al multilayer foils ignited with electric current
- Evolution of γ′ morphology and γ/γ′ lattice parameter misfit in a nickel-based superalloy during non-equilibrium cooling
- Effect of heat treatment on the precipitation hardening in FeNiCoAlTaB shape memory alloys
- The structure and formation mechanism of FeS2/Fe3S4/S8 nanocomposite synthesized using spherical shaped Fe3O4 nanoparticles as the precursor
- Short Communications
- Characterization of Inconel 625 surface layer modified by laser shock processing
- DGM News
- DGM News