Paper Title:
Bulk Ultrafine-Grained Nickel Consolidated from Nanopowders
  Abstract

Ultrafine-grained samples were consolidated from Ni nanopowders with the nominal particle size of 50 and 100 nm by Hot Isostatic Pressing (HIP) and Spark Plasma Sintering (SPS). The higher nickel-oxide content and the smaller grain size of SPS-processed samples result in a higher yield strength at room temperature compared with HIP-processed specimen. It is found that during compression the dislocation density increases while the twins decay in both samples, indicating that the deformation is mediated mainly by dislocations. As a consequence of the higher oxide content, the flow stress of the SPS-processed samples saturates at small strain values while the HIP-processed specimen shows strain hardening even at the strain value of 0.35. After saturation of the flow stress for SPS-processed samples the deformation is most probably mediated rather by grain rotation or grain boundary-related mechanisms such as sliding and/or decohesion instead of dislocation motion.

  Info
Periodical
Edited by
P.J. Szabó, T. Réti, T. Czigány
Pages
93-98
DOI
10.4028/www.scientific.net/MSF.589.93
Citation
J. Gubicza, Q. H. Bui, F. Fellah, N. Szász, G. Dirras, "Bulk Ultrafine-Grained Nickel Consolidated from Nanopowders", Materials Science Forum, Vol. 589, pp. 93-98, 2008
Online since
June 2008
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$32.00
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