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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12824
Title: Evolution of microstructures and mechanical properties of spark plasma sintered Fe-Cr-Nb alloys
Authors: Muthaiah V.M.S.
Mula, Suhrit
Published in: Materials Science and Engineering A
Abstract: Present study investigates microstructural stability and mechanical properties of spark plasma sintered Fe-Cr-Nb alloys for its nuclear first wall reactor application. The nanostructured alloys were prepared by mechanical alloying (MA) for 25 h in argon atmosphere (purity < 10 ppm O2) using SPEX 8000 M high energy ball mill. After evaluation of thermal stability of the alloy powders, spark plasma sintering was performed at 800, 900 and 1000 °C at a heating rate of 100 °C/min with a holding period of 5 min. X-ray diffraction phase analysis followed by TEM-SAED pattern analysis of the sintered samples confirmed the stability of complete solid solubility of the Fe-Cr-Nb alloys after sintering even at 1000 °C. Relative sintered density and microhardness values were found to increase with increase in the sintering temperatures. The microhardness value of the sintered Fe-15Cr-1Nb sample was measured to be 9.5 GPa corresponding to the relative sintered density of ~ 98%. The compressive strength was assessed to be quite high (2400 MPa) for the Fe-15Cr-1Nb sample sintered at 1000 °C. Retaining of nanostructures (confirmed by TEM analysis) after sintering at 1000 °C is ascribed for such high hardness and compressive strength. Analysis of strengthening mechanisms and their quantitative estimation have been made for solid solution strengthening, grain size strengthening and dislocation strengthening and are found to correlate well with experimentally measured compression strength results. © 2018 Elsevier B.V.
Citation: Materials Science and Engineering A (2019), 739(): 367-376
URI: https://doi.org/10.1016/j.msea.2018.10.074
http://repository.iitr.ac.in/handle/123456789/12824
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: Compressive strength
Fe-Cr-Nb nanostructures
Grain boundary segregation
Solid solution strengthening
Spark plasma sintering
Transmission electron microscopy
ISSN: 9215093
Author Scopus IDs: 57133132500
12783902100
Author Affiliations: Muthaiah, V.M.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
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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