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Carbon impurity dis...
Carbon impurity dissolution and migration in bcc Fe-Cr : First-principles calculations
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- Sandberg, Nils (författare)
- Uppsala universitet,KTH,Reaktorfysik,Institutionen för neutronforskning
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- Henriksson, Krister O. E. (författare)
- KTH,Kärnkraftssäkerhet
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- Wallenius, Janne, 1968- (författare)
- KTH,Reaktorfysik
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Wallenius, Jan (författare)
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(creator_code:org_t)
- 2008
- 2008
- Engelska.
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 78:9
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- First-principles density-functional theory calculations for C solution enthalpies, H-sol, and diffusion activation enthalpies, H-diff, in body-centered-cubic Fe and Cr are presented. The results for C in Fe compare well with experiments, provided that the effect of magnetic disordering is accounted for. Likewise, in Cr, the calculated Hsol and Hdiff agree well with available experiments. In both materials, the deviation between calculated enthalpies and critically assessed experimental enthalpies are less than 0.05 eV. Further, first-principles calculations for the interaction energies between a solute (e.g., a Cr atom in bcc Fe) and an interstitial C atom are presented. The results are in conflict with those inferred from internal friction (IF) experiments in disordered Fe-Cr-C alloys. A simple model of C relaxation in disordered Fe-Cr is used to compare theoretical and experimental IF curves directly. The results suggest that a more extensive study of the energetic, thermodynamic, and kinetic aspects of C migration in Fe-Cr is needed.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- augmented-wave method
- molecular-dynamics
- alloys
- solubility
- chromium
- metals
- transition
- cementite
- carbides
- energy
- Physics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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