4.7 Article

Substantial role of charge transfer on the diffusion mechanism of interstitial elements in α-titanium: A First-principles study

期刊

SCRIPTA MATERIALIA
卷 203, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.114065

关键词

Titanium; Diffusion mechanism; First-principles calculations

资金

  1. Council for Science, Technology and Innovation, Cross-ministerial Strategic Innovation Promotion Program (SIP)
  2. JST
  3. Japan Society for the Promotion of Science (JSPS) [19H05786]
  4. Grants-in-Aid for Scientific Research [19H05786] Funding Source: KAKEN

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The diffusion mechanism of interstitial solute elements in alpha-Ti was investigated using first-principles calculations. The results indicate a high correlation between migration energies and the difference in charge densities of solute atoms, affecting the diffusion mechanism of solute atoms. Charge transfer between matrix and solute atoms plays a significant role in determining diffusion behavior in Ti.
The diffusion mechanism of interstitial solute elements in alpha-Ti was investigated using first-principles calculations. Solute elements, B, C, N, O and F, were confirmed to be the most stable at octahedral sites with their calculated formation energies. The migration energies of C, N and O are high, approximately 2 eV, while those of B and F were approximately 1 eV. A high correlation was observed between the migration energies and difference in the charge densities of the solute atoms between stable and transition states. These results indicate that migration energies and resultant diffusion could not be determined only by the atomic radii of solute atoms, and charge transfer must also be taken into consideration. The charge transfer between matrix and solute atoms affects diffusion mechanism of solute atoms in Ti. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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