TY - JOUR
T1 - Effect of elastic collisions and electronic excitation on lattice structure of NiTi bulk intermetallic compound irradiated with energetic ions
AU - Ochi, M.
AU - Kojima, H.
AU - Hori, F.
AU - Kaneno, Y.
AU - Semboshi, S.
AU - Saitoh, Y.
AU - Okamoto, Y.
AU - Ishikawa, N.
AU - Iwase, A.
N1 - Funding Information:
The authors thank the staff of accelerator divisions of Japan Atomic Energy Research Institute (JAEA) and Institutes for Quantum and Radiological Science and Technology (QST) for their help. The authors also thank Y. Matsuda for the GIXD measurements. The present study has been carried out under the collaboration programs between Osaka Prefecture University, and Institutes for Quantum and Radiological Science and Technology, Japan Atomic Energy Agency, or Institute for Materials Research, Tohoku University. The present research was financially supported by the Kansai Atomic Conference .
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/7/15
Y1 - 2018/7/15
N2 - NiTi bulk intermetallic compound with the B19′ structure was irradiated with 1 MeV He, 5 MeV Al, 16 MeV Au and 200 MeV Xe ions, and the change in lattice structure near the surface by the ion bombardment was investigated by using the grazing incidence X-ray diffraction (GIXD) and the extended X-ray absorption fine structure (EXAFS). The lattice structure transformation by the irradiation strongly depends on ion species and/or energies. For the 1 MeV He irradiation, the lattice structure changed from B19′ to the A2 structure, but did not show an amorphization even after the high fluence irradiation. For the 5 MeV Al irradiation, the samples are partially amorphized. For the 16 MeV Au irradiation, the lattice structure of the NiTi samples changed nearly completely from the B19′ structure to the amorphous state via the A2 structure. The value of dpa (displacement per atom) which is needed for the amorphization is, however, much smaller than the case of the Al ion irradiation. For the 200 MeV Xe ion irradiation, the lattice structure completely changed to the A2 structure even by a small ion fluence. The dependence of the lattice structure transformation on elastic collisions (dpa), the spectrum of the primary knock-on (PKA) atoms and the density of energy deposited through electronic excitation was discussed.
AB - NiTi bulk intermetallic compound with the B19′ structure was irradiated with 1 MeV He, 5 MeV Al, 16 MeV Au and 200 MeV Xe ions, and the change in lattice structure near the surface by the ion bombardment was investigated by using the grazing incidence X-ray diffraction (GIXD) and the extended X-ray absorption fine structure (EXAFS). The lattice structure transformation by the irradiation strongly depends on ion species and/or energies. For the 1 MeV He irradiation, the lattice structure changed from B19′ to the A2 structure, but did not show an amorphization even after the high fluence irradiation. For the 5 MeV Al irradiation, the samples are partially amorphized. For the 16 MeV Au irradiation, the lattice structure of the NiTi samples changed nearly completely from the B19′ structure to the amorphous state via the A2 structure. The value of dpa (displacement per atom) which is needed for the amorphization is, however, much smaller than the case of the Al ion irradiation. For the 200 MeV Xe ion irradiation, the lattice structure completely changed to the A2 structure even by a small ion fluence. The dependence of the lattice structure transformation on elastic collisions (dpa), the spectrum of the primary knock-on (PKA) atoms and the density of energy deposited through electronic excitation was discussed.
KW - Elastic collisions
KW - Electronic excitation
KW - Energetic ion bombardment
KW - NiTi intermetallic compound
KW - Transformation of lattice structure
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U2 - 10.1016/j.nimb.2018.04.035
DO - 10.1016/j.nimb.2018.04.035
M3 - Article
AN - SCOPUS:85046451631
SN - 0168-583X
VL - 427
SP - 14
EP - 19
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
ER -