MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Molecular Dynamics Investigation of the Effect of Lanthanum on the Diffusivity of Niobium in Austenite
Haiyan WangZhaofeng YaoXueyun GaoPeng CuiHuiping Ren
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2018 Volume 59 Issue 5 Pages 706-711

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Abstract

By employing the force-matching method, an embedded-atom-method potential for Fe–Nb–La dilute solid solution has been constructed by fitting to a set of density-functional theory (DFT) data of reference structures. The developed potential reproduces the properties of the reference structures in good agreement. Using the developed potential, molecular dynamics simulations were performed to investigate the diffusion coefficients of Nb in Fe–Nb and Fe–Nb–La systems, respectively. The results indicate that the addition of La suppresses the diffusion of Nb in fcc Fe, the activation energy of Nb was determined to be 47551 J/mol in the absence of La while 82672 J/mol in the presence of La, and consequently leads to the longer incubation time of NbC precipitation in the La micro-alloyed austenite.

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© 2018 The Japan Institute of Metals and Materials
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