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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12916
Title: Microstructural evolution and thermal stability of Fe–Zr metastable alloys developed by mechanical alloying followed by annealing
Authors: Sooraj S.
Muthaiah V.M.S.
Kang P.C.
Koch C.C.
Mula S.
Published in: Philosophical Magazine
Abstract: The effect of Zr (up to 1 at.%) addition on the formation of Fe–Zr metastable alloys and their thermal stability were investigated for their possible nuclear applications. Fe–xZr (x = 0.25, 0.5, 1%) alloys were synthesised by mechanical alloying under a high-purity argon atmosphere using stainless steel grinding media in a SPEX 8000M high energy mill. The milling was conducted for 20 h with a ball-to-powder weight ratio of 10:1. The formation of metastable solid solutions after milling was confirmed from the change in the Gibbs free energy analysis as per Miedema’s model. The microstructural characterisation was carried out by analysis of X-ray diffraction, atomic force microscopy and transmission electron microscopy. The effect of Zr on the thermal stability of Fe–Zr alloys was investigated by extensive annealing experiments followed by microstructural analysis and microhardness measurements. The stabilisation was found to occur at 800 °C and thereafter, no significant change in the crystallite size was observed for the samples annealed between 800 and 1200 °C. The supersaturated solid solution, especially 1% Zr alloy, found to be highly stable up to 800 °C and the microhardness value of the same measured to be as high as 8.8 GPa corresponding to a crystallite size of 57 nm. The stabilisation effect has been discussed in the light of both the thermodynamic and kinetic mechanisms and the grain size stabilisation is attributed to the grain boundary segregation of Zr atoms and/or Zener pinning by nanoscale precipitation of the Fe2Zr phase. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
Citation: Philosophical Magazine (2016), 96(25): 2649-2670
URI: https://doi.org/10.1080/14786435.2016.1212173
http://repository.iitr.ac.in/handle/123456789/12916
Issue Date: 2016
Publisher: Taylor and Francis Ltd.
Keywords: electron microscopy
interfacial segregation
Mechanical alloying
nanoscale precipitation
thermal stabilisation
X-ray diffraction
ISSN: 14786435
Author Scopus IDs: 55598437200
57133132500
7007182376
57203364844
12783902100
Author Affiliations: Sooraj, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India
Muthaiah, V.M.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India
Kang, P.C., School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China
Koch, C.C., Department of Materials Science and Engineering, NC State University, Raleigh, NC, United States
Mula, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India
Corresponding Author: Mula, S.; Department of Metallurgical and Materials Engineering, Indian Institute of TechnologyIndia; email: smulafmt@iitr.ac.in
Appears in Collections:Journal Publications [MT]

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