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Microstructure and mechanical behavior of ultrafine-grained Ni processed by different powder metallurgy methods

Published online by Cambridge University Press:  31 January 2011

J. Gubicza ,
H-Q. Bui ,
F. Fellah  and
G.F. Dirras
J. Gubicza*
Affiliation:
Department of Materials Physics, Eötvös University, Budapest H-1117, Hungary
H-Q. Bui
Affiliation:
Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux–Centre National de la Recherche Scientifique, Université Paris 13, 93430 Villetaneuse, France
F. Fellah
Affiliation:
Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux–Centre National de la Recherche Scientifique, Université Paris 13, 93430 Villetaneuse, France
G.F. Dirras
Affiliation:
Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux–Centre National de la Recherche Scientifique, Université Paris 13, 93430 Villetaneuse, France
*
a) Address all correspondence to this author. e-mail: gubicza@metal.elte.hu
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Abstract

Ultrafine-grained samples were produced from a Ni nanopowder by hot isostatic pressing (HIP) and spark plasma sintering (SPS). The microstructure and mechanical behavior of the two specimens were compared. The grain coarsening observed during the SPS procedure was moderated due to a reduced temperature and time of consolidation compared with HIP processing. The smaller grain-size and higher nickel-oxide content in the SPS-processed sample resulted in a higher yield strength. Compression experiments showed that the specimen produced by SPS reached a maximal flow stress at a small strain, which was followed by a long steady-state softening while the HIP-processed sample hardened until failure. It was revealed that the softening of the SPS-processed sample resulted from microcracking along the grain boundaries.

Keywords

MicrostructureStrength
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 1 , January 2009 , pp. 217 - 226
Copyright
Copyright © Materials Research Society 2009

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