Article (Scientific journals)
Size effects and temperature dependence on strain-hardening mechanisms in some face centered cubic materials
HUG, E.; DUBOS, P.A.; keller, C. et al.
2015In Mechanics of Materials, 91, p. 136-151
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Keywords :
size effects; thermomechanical behaviour; plasticity; face centered cubic materials; dislocations substructures; strain gradient plasticity model
Abstract :
[en] The mechanical behaviour of face centered cubic metals is deeply affected when specimen dimensions decrease from a few The millimeters to a few micrometers. At room temperature, a critical thickness (t) to grain size (d) ratio (t/d)c, was previously highlighted, under which the sofiening of mechanical properties became very pronounced both in terms of Hall-Petch relation and work hardening mechanisms. In this work, new experimental results are provided concerning the influence of temperature on this size effect for copper, nickel and Ni-20wt.%Cr, representative of a wide range of deformation mechanisms (i.e. dislocation slip character). It is shown that multicrystalline samples (t/d < (t/d)c) are not deeply affected by an increase in temperature, independently of the planar or wavy character of dislocation glide. For pronounced wavy slip character metals, surface effects in polycrystals (t/d > (t/d)c) are not significant enough to reduce the gap between polycrystal and multierystal mechanical behaviour when the temperature increases. However, a transition from wavy slip to planar glide mechanisms induces a modification ofthe polycrystalline behaviour which tends tovard multicrystalline one with a moderate increase in temperature. This work demonstrates that surface effects and grain size influence can be successfully disassociated for the three studied materials using an analysis supported by the Kooks- Mecking formalism. All these results are supported by microscopic investigations of dislocation substructures and compared to numerical simulations using a stress gradient plasticity model.
Disciplines :
Materials science & engineering
Author, co-author :
HUG, E.
DUBOS, P.A.
keller, C.
Duchene, Laurent  ;  Université de Liège > Département ArGEnCo > Analyse multi-échelles des matériaux et struct. du gén. civ.
Habraken, Anne  ;  Université de Liège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Size effects and temperature dependence on strain-hardening mechanisms in some face centered cubic materials
Publication date :
July 2015
Journal title :
Mechanics of Materials
ISSN :
0167-6636
Publisher :
Elsevier Science
Volume :
91
Pages :
136-151
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Funders :
CÉCI - Consortium des Équipements de Calcul Intensif [BE]
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