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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12828
Title: Feasibility of formation of nanocrystalline Fe-Cr-Y alloys: Mechanical properties and thermal stability
Authors: Muthaiah V.M.S.
Babu L.H.
Koch C.C.
Mula, Suhrit
Published in: Materials Characterization
Abstract: Aim of the present study is to investigate the feasibility of formation of Fe-Cr-Y disordered solid solutions by mechanical alloying and effect of Y on the thermal stability and mechanical properties of such nanocrystalline alloys. Thermodynamic analysis by Miedema's and Toop's models confirms that the energy barrier required to form the disordered solid solutions has been overcome by the stored energy due to strain dislocations and grain boundary defects. Although limited grain growth was observed during annealing of metastable Fe-15Cr-1Y alloy, the grains size found to stabilize at ~ 53 nm after annealing at 1000°C; and the corresponding hardness value measured to be also quite high (8 GPa). The grain size analysis by TEM and AFM is well-corroborated with the XRD crystallite size. The high thermal stability and large strengthening effect have been discussed in the light of grain boundary pinning by solute segregation, solute drag effect and Zener pinning due to intermetallic phase(s). © 2016 Elsevier Inc. All rights reserved.
Citation: Materials Characterization (2016), 114(): 43-53
URI: https://doi.org/10.1016/j.matchar.2016.02.005
http://repository.iitr.ac.in/handle/123456789/12828
Issue Date: 2016
Publisher: Elsevier Inc.
Keywords: Electron microscopy
Fe-Cr-Y nanostructures
Grain boundary segregation
Miedema's & Toop's models
Zener pinning
ISSN: 10445803
Author Scopus IDs: 57133132500
57132701400
57203364844
12783902100
Author Affiliations: Muthaiah, V.M.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Babu, L.H., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Koch, C.C., Department of Materials Science and Engineering, NC State University, 911 Partner's Way, EB I, Room 3002, Raleigh, NC 27606, United States
Mula, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Corresponding Author: Mula, S.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology RoorkeeIndia; email: smulafmt@iitr.ac.in
Appears in Collections:Journal Publications [MT]

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