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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12898
Title: Mechanical properties and electrical conductivity of Cu-Cr and Cu-Cr-4% SiC nanocomposites for thermo-electric applications
Authors: Mula S.
Sahani P.
Pratihar S.K.
Mal S.
Koch C.C.
Published in: Materials Science and Engineering A
Abstract: The present work investigates the feasibility of microwave sintering to produce bulk metal-based nanocomposites having blend composition of Cu99Cr1, Cu94Cr6, Cu99Cr1-4wt.% SiC and Cu94Cr6-4wt.% SiC (average particle size ∼30nm). The 50h ball-milled samples were uniaxially pressed, and then pellets were sintered at 800°C, 900°C and 1000°C for a constant soaking period of 30min by microwave sintering technique. Microstructural characterization was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Sintered compacts resulted a highly densified compacts (∼95% relative density) while retaining ultra-fine grains (100-200nm) in the matrix. The mechanical properties, namely, hardness and wear resistance, and electrical conductivity of the sintered specimens were also evaluated. The best combination of mechanical properties (e.g. hardness ∼2.4GPa) and electrical conductivity (60.3% of IACS) were obtained for Cu94Cr6-4wt.% SiC sintered at 900°C. This is possibly due to presence of ultra-fine grains in the bulk samples, good densification and proper bonding between particles. The results were analyzed in the light of interactions of microwaves between metallic matrix and microwave susceptive SiC particulates. © 2011 Elsevier B.V.
Citation: Materials Science and Engineering A (2011), 528(13-14): 4348-4356
URI: https://doi.org/10.1016/j.msea.2011.03.040
http://repository.iitr.ac.in/handle/123456789/12898
Issue Date: 2011
Keywords: Atomic force microscopy (AFM)
Electrical conductivity
Microwave sintering
Nanocomposite
Wear resistance
X-ray diffraction (XRD)
ISSN: 9215093
Author Scopus IDs: 12783902100
37093758100
6507834830
36160564100
57203364844
Author Affiliations: Mula, S., Department of Materials Science and Engineering, NC State University, Raleigh, NC 27695, United States, Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela 769008, Orissa, India
Sahani, P., Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela 769008, Orissa, India
Pratihar, S.K., Department of Ceramic Engineering, National Institute of Technology, Rourkela 769008, Orissa, India
Mal, S., Department of Materials Science and Engineering, NC State University, Raleigh, NC 27695, United States
Koch, C.C., Department of Materials Science and Engineering, NC State University, Raleigh, NC 27695, United States
Corresponding Author: Mula, S.; Department of Materials Science and Engineering, NC State University, Raleigh, NC 27695, United States; email: suhritmula@gmail.com
Appears in Collections:Journal Publications [MT]

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