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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24238
Title: Thermal stability and mechanical properties of Fe-Cr-Zr alloys developed by mechanical alloying followed by spark plasma sintering
Authors: Muthaiah V.M.S.
Koch C.C.
Mula, Suhrit
Published in: Journal of Alloys and Compounds
Abstract: The present work aims to investigate (i) the feasibility of formation of Fe-7Cr-xZr and Fe-15Cr-xZr (x = 0.25, 0.5 and 1 at%) disordered solid solutions by mechanical alloying (MA) and (ii) their thermal stability and mechanical properties of spark plasma sintered (SPSed) samples. Effect of Zr addition on phase evolution in Fe-Cr-Zr alloy and its influence on their thermal stability and mechanical properties (microhardness and compression strength) have been studied in detail. Transmission electron microscopy-selected area diffraction pattern (TEM-SAED) and X-ray diffraction (XRD) phase analysis confirm the formation of complete solid solution after 25 h of MA. Grain size was observed to stabilize significantly within nanometer range after annealing at 600–1200 °C. The SPSed (at 1000 °C) samples showed the best combination of hardness (9.4 GPa) and compressive strength (ultimate compressive strength-2200 MPa and yield strength-1800 MPa) corresponding to an average grain size of<100 nm. This is due to the strengthening mechanisms of grain boundary strengthening (owing to solute segregation and solute drag effect), precipitation hardening (Zener pinning) by Fe2Zr phase and excellent densification achieved by SPS. © 2020 Elsevier B.V.
Citation: Journal of Alloys and Compounds, 856
URI: https://doi.org/10.1016/j.jallcom.2020.158266
http://repository.iitr.ac.in/handle/123456789/24238
Issue Date: 2021
Publisher: Elsevier Ltd
Keywords: Fe-Cr-Zr alloys
Solute segregation
Spark plasma sintering
Transmission electron microscopy
Zener pinning
ISSN: 9258388
Author Scopus IDs: 57133132500
57203364844
12783902100
Author Affiliations: Muthaiah, V.M.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India, Department of Materials Engineering, Indian Institute of Science, Bengaluru, 560012, India
Koch, C.C., Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27606, United States
Mula, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: Metallurgical and Materials Engineering Department and Institute Instrumentation Center, IIT Roorkee are highly acknowledged for granting all the facilities required to carry out the research work. Indian Institute of Technology Roorkee, IITR
Corresponding Author: Mula, S.; Department of Metallurgical and Materials Engineering, India; email: suhrit.mula@mt.iitr.ac.in
Appears in Collections:Journal Publications [MT]

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