TY - JOUR
T1 - Effect of high doses of N+, N+ + Ni+, and Mo+ + W+ ions on the physicomechanical properties of TiNi
AU - Pogrebnyak, A. D.
AU - Bratushka, S. N.
AU - Malikov, L. V.
AU - Levintant, N.
AU - Erdybaeva, N. K.
AU - Plotnikov, S. V.
AU - Gritsenko, B. P.
N1 - Funding Information:
This work was supported in part by the program “Nanosystems, Nanofilms, and Nanomaterials and New Physical Principles of Producing Nanofilms, Nanomaterials, and Nanocoatings with Plasma-Ion and Electron Beams,” National Academy of Sciences of Ukraine.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/5
Y1 - 2009/5
N2 - The surface layer of an equiatomic TiNi alloy, which exhibits the shape memory effect in the martensitic state, is modified with high-dose implantation of 65-keV N+ ions (the implantation dose is varied from 10 17 to 1018 ions/cm2). TiNi samples are implanted by N+, Ni+-N+, and Mo +-W+ ions at a dose of 1017-1018 cm-2 and studied by Rutherford backscattering, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction (glancing geometry), and by measuring the nanohardness and the elastic modulus. A Ni + concentration peak is detected between two maxima in the depth profile of the N+ ion concentration. X-ray diffraction (glancing geometry) of TiNi samples implanted by Ni+ and N+ ions shows the formation of the TiNi (B2), TiN, and Ni3N phases. In the initial state, the elastic modulus of the samples is E = 56 GPa at a hardness of H = 2.13 ± 0.30 GPa (at a depth of 150 nm). After double implantation by Ni+-N+ and W+-Mo+ ions, the hardness of the TiNi samples is 2.78 ± 0.95 GPa at a depth of 150 nm and 4.95 ± 2.25 GPa at a depth of 50 nm; the elastic modulus is 59 GPa. Annealing of the samples at 550°C leads to an increase in the hardness to 4.44 ± 1.45 GPa and a sharp increase in the elastic modulus to 236 ± 39 GPa. A correlation between the elemental composition, microstructure, shape memory effect, and mechanical properties of the near-surface layer in TiNi is found.
AB - The surface layer of an equiatomic TiNi alloy, which exhibits the shape memory effect in the martensitic state, is modified with high-dose implantation of 65-keV N+ ions (the implantation dose is varied from 10 17 to 1018 ions/cm2). TiNi samples are implanted by N+, Ni+-N+, and Mo +-W+ ions at a dose of 1017-1018 cm-2 and studied by Rutherford backscattering, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction (glancing geometry), and by measuring the nanohardness and the elastic modulus. A Ni + concentration peak is detected between two maxima in the depth profile of the N+ ion concentration. X-ray diffraction (glancing geometry) of TiNi samples implanted by Ni+ and N+ ions shows the formation of the TiNi (B2), TiN, and Ni3N phases. In the initial state, the elastic modulus of the samples is E = 56 GPa at a hardness of H = 2.13 ± 0.30 GPa (at a depth of 150 nm). After double implantation by Ni+-N+ and W+-Mo+ ions, the hardness of the TiNi samples is 2.78 ± 0.95 GPa at a depth of 150 nm and 4.95 ± 2.25 GPa at a depth of 50 nm; the elastic modulus is 59 GPa. Annealing of the samples at 550°C leads to an increase in the hardness to 4.44 ± 1.45 GPa and a sharp increase in the elastic modulus to 236 ± 39 GPa. A correlation between the elemental composition, microstructure, shape memory effect, and mechanical properties of the near-surface layer in TiNi is found.
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U2 - 10.1134/S1063784209050107
DO - 10.1134/S1063784209050107
M3 - Article
AN - SCOPUS:65649135509
VL - 54
SP - 667
EP - 673
JO - Technical Physics
JF - Technical Physics
SN - 1063-7842
IS - 5
ER -