TY - JOUR
T1 - Investigation of Cu diffusivity in Fe by a combination of atom probe experiments and kinetic Monte Carlo simulation
AU - Zhao, Can
AU - Suzudo, Tomoaki
AU - Toyama, Takeshi
AU - Nishitani, Shigeto
AU - Inoue, Koji
AU - Nagai, Yasuyoshi
N1 - Funding Information:
This work was supported by KAKENHI (26709073, 17H03517 and 20H02661). This work was performed under the GIMRT program of IMR, Tohoku Univ. (18M0405, 19M0407, and 20M0406).
Publisher Copyright:
© 2021 The Japan Institute of Metals and Materials
PY - 2021
Y1 - 2021
N2 - In the present study, the diffusion coefficient of Cu in Fe was experimentally estimated from the precipitation kinetics down to 390°C. At this temperature, diffusion couples, which is a typical method to obtain diffusion coefficients, cannot be applied. The matrix Cu concentration and the number density of Cu precipitates in Fe-Cu alloy, which were the main parameters used to estimate the diffusion coefficient, were directly obtained using atom probe tomography. The temperature dependency of the diffusion coefficient of Cu in Fe estimated in the present study was more reliable than that obtained in a previous study, which also reported the diffusion coefficient of Cu in Fe from precipitation kinetics. This indicated that our estimation of the diffusion coefficient of Cu in Fe with atom probe tomography measurements yielded greater accuracy. In addition, the estimated diffusion coefficient of Cu in Fe tended to deviate to higher values from the extrapolated diffusion coefficient of Cu in Fe, which was obtained by diffusion couples, with decreasing temperature. This deviation is discussed by employing a kinetic Monte Carlo simulation.
AB - In the present study, the diffusion coefficient of Cu in Fe was experimentally estimated from the precipitation kinetics down to 390°C. At this temperature, diffusion couples, which is a typical method to obtain diffusion coefficients, cannot be applied. The matrix Cu concentration and the number density of Cu precipitates in Fe-Cu alloy, which were the main parameters used to estimate the diffusion coefficient, were directly obtained using atom probe tomography. The temperature dependency of the diffusion coefficient of Cu in Fe estimated in the present study was more reliable than that obtained in a previous study, which also reported the diffusion coefficient of Cu in Fe from precipitation kinetics. This indicated that our estimation of the diffusion coefficient of Cu in Fe with atom probe tomography measurements yielded greater accuracy. In addition, the estimated diffusion coefficient of Cu in Fe tended to deviate to higher values from the extrapolated diffusion coefficient of Cu in Fe, which was obtained by diffusion couples, with decreasing temperature. This deviation is discussed by employing a kinetic Monte Carlo simulation.
KW - Atom probe tomography
KW - Copper diffusivity in iron
KW - Copper precipitation
KW - Iron copper alloy
KW - Monte Carlo simulation
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U2 - 10.2320/matertrans.MT-M2021028
DO - 10.2320/matertrans.MT-M2021028
M3 - Article
AN - SCOPUS:85108895695
VL - 62
SP - 929
EP - 934
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 7
ER -