Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.706-711
© 2018 The Japan Institute of Metals and Materials

Molecular Dynamics Investigation of the Effect of Lanthanum on the Diffusivity of Niobium in Austenite

Haiyan Wang, Zhaofeng Yao, Xueyun Gao, Peng Cui and Huiping Ren

School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China

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.

[doi:10.2320/matertrans.M2018013]

(Received 2018/01/10; Accepted 2018/02/26; Published 2018/04/25)

Keywords: molecular dynamics, EAM potential, lanthanum, niobium, diffusion, fcc Fe

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