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Mechanical Spectroscopy of Nanocrystalline Metals

Published online by Cambridge University Press:  14 March 2011

E. Bonetti ,
L. Pasquini  and
L. Savini
E. Bonetti
Affiliation:
Department of Physics, University of Bologna and INFMv. Berti-Pichat 6/2 40127 Bologna, Italy
L. Pasquini
Affiliation:
Department of Physics, University of Bologna and INFMv. Berti-Pichat 6/2 40127 Bologna, Italy
L. Savini
Affiliation:
Department of Physics, University of Bologna and INFMv. Berti-Pichat 6/2 40127 Bologna, Italy
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Abstract

The mechanical behavior of nanocrystalline iron and nickel prepared by mechanical attrition and inert gas condensation was investigated using mechanical spectroscopy techniques in the quasi static-and low frequency dynamic stress-strain regimes. The measures were performed on samples previously stabilized by thermal annealing at low homologous temperatures. The results of elastic energy dissipation, creep, and creep recovery measurements performed in the low strain regime (ε = 10−5−10−3) allowed to trace a phenomenological picture of the anelastic and viscoplastic behavior of nanocrystalline Ni and Fe in the 300-450 K range with different grain sizes and interfaces disorder degree. Activation energies of the thermally activated anelastic and plastic mechanisms responsible for the mechanical behavior have been evaluated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 634: Symposium B – Structure and Mechanical Properties of Nanophase Materials-Theory & Computer Simulations vs. Experiment , 2000 , B1.5.1
Copyright
Copyright © Materials Research Society 2001

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