Skip navigation
Please use this identifier to cite or link to this item:
Title: Concentration-gradient-driven anisotropic spinodal decomposition kinetics: nitriding of metallic alloys
Authors: Sasidhar K.N.
Gururajan M.P.
Meka, Sai Ramudu
Published in: Philosophical Magazine Letters
Abstract: The effect of crystallographically oriented, unidirectional concentration gradients on spinodal decomposition in cubic crystalline solids with elastic and interfacial energy anisotropy is discussed. Phase-field simulations reveal that the kinetics of spinodal decomposition occurring in such systems is dependent on the degree of misorientation between the direction of composition gradient and the preferred crystallographic orientation for growth of spinodal fluctuations; the larger is the misorientation, the slower the kinetics. This phenomenon has been used to explain the well-known grain-orientation-dependent N-uptake kinetics observed during nitriding of metallic alloys. Several plausible causes have been proposed in the literature for the grain-orientation-dependent N-uptake kinetics during nitriding. However, this study reveals that this phenomenon is observed exclusively and without exception in alloy systems having a spinodal instability. The N-uptake kinetics in such systems is known to be dependent on the kinetics of spinodal decomposition. Consequently, anisotropic spinodal decomposition kinetics occurring owing to the presence of a surface-directed N-composition gradient in poly-crystalline metals has been shown to be a more fundamental cause for the phenomenon. © 2021 Informa UK Limited, trading as Taylor & Francis Group.
Citation: Philosophical Magazine Letters, 101(11): 432-443
Issue Date: 2021
Publisher: Taylor and Francis Ltd.
Keywords: elastic anisotropy
interfacial energy anisotropy
Spinodal decomposition
ISSN: 9500839
Author Scopus IDs: 57194204113
Author Affiliations: Sasidhar, K.N., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, India, Department Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
Gururajan, M.P., Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, India
Meka, S.R., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, India
Funding Details: We are grateful to Max Planck Society, Germany for financial support to the Max-Planck Partner Group of the Department of Microstructure Physics and Alloy Design, Max Planck Institute for Iron Research, Dusseldorf, Germany at Indian Institute of Technology Roorkee, Roorkee, India. Authors are also grateful to the Ministry of Human Resource Development, Government of India, for financial support under PMRF. Max-Planck-Gesellschaft, MPG; Ministry of Education, India, MoE
Corresponding Author: Meka, S.R.; Department of Metallurgical and Materials Engineering, India; email:
Appears in Collections:Journal Publications [MT]

Files in This Item:
There are no files associated with this item.
Show full item record

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.