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Microstructure and properties of hot extruded Cu-1 wt% Al2O3 nano-composites synthesized by various techniques

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Title Microstructure and properties of hot extruded Cu-1 wt% Al2O3 nano-composites synthesized by various techniques
 
Creator CHANDRASEKHAR, SB
SARMA, SS
RAMAKRISHNA, M
BABU, PS
RAO, TN
KASHYAP, BP
 
Subject Mechanical alloying
Powder metallurgy
Composites Nanostructured materials
Mechanical characterization
Electron microscopy
WIRE ELECTRICAL EXPLOSION
NANOCRYSTALLINE MATERIALS
POWDERS
COPPER
NANOPOWDERS
DISCHARGE
STRENGTH
ALLOYS
 
Description Cu-1 wt% Al(2)0(3) nano-composites were prepared by three different methods, namely mechanical alloying, combustion synthesis and electrical explosion of wire, in order to investigate the effect of power processing technique on microstructure and ambient properties. The powders produced by these techniques were hydrogen reduced at 500 degrees C and subsequently vacuum encapsulated in copper container followed by consolidation using hot extrusion at 800 C and 600 MPa to nearly full density. As-synthesized composite powders as well as the extruded samples were characterized by scanning electron microscope, X-ray diffraction, transmission electron microscope, thermal conductivity and electrical conductivity. Microhardness and room temperature deformation behavior in compression at a strain rate of 10(-4) s(-1) were measured. The mechanically milled powders, upon consolidation, exhibited a finer grain size of 146 nm and a hardness of 164 HV1.0 compared to that obtained by two other techniques, which ranged between 179-390 nm and 135-156 HV1.0, respectively. The physical and mechanical properties were found to vary with grain size according to the Hall-Petch type relationship, irrespective of the processing technique employed for getting these grain sizes. (C) 2013 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:11:03Z
2014-12-28T17:11:03Z
2014
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 59146-53
0921-5093
1873-4936
http://dx.doi.org/10.1016/j.msea.2013.10.074
http://dspace.library.iitb.ac.in/jspui/handle/100/16969
 
Language English