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Grain boundary strengthening of FCC polycrystals

Published online by Cambridge University Press:  13 March 2019

R. Arturo Rubio ,
Sarra Haouala  and
Javier LLorca
R. Arturo Rubio
Affiliation:
IMDEA Materials Institute, Getafe, Madrid 28906, Spain
Sarra Haouala
Affiliation:
IMDEA Materials Institute, Getafe, Madrid 28906, Spain
Javier LLorca*
Affiliation:
IMDEA Materials Institute, Getafe, Madrid 28906, Spain; and Department of Materials Science, Polytechnic University of Madrid, Madrid 28040, Spain
*
a)Address all correspondence to this author. e-mail: javier.llorca@imdea.org
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Abstract

The effect of grain size on the flow strength of FCC polycrystals was analyzed by means of computational homogenization. The mechanical behavior of each grain was dictated by a dislocation-based crystal plasticity model in the context of finite strain plasticity and takes into the account the formation of pile-ups at grain boundaries. All the model parameters have a clear physical meaning and were identified for different FCC metals from dislocation dynamics simulations or experiments. It was found that the influence of the grain size on the flow strength of FCC polycrystals was mainly dictated by the similitude coefficient K that establishes the relationship between the dislocation mean free path and the dislocation density in the bulk. Finally, the modeling approach was validated by comparison with experimental results of the effect of grain size on the flow strength of Ni, Al, Cu, and Ag.

Keywords

grain sizestrengthpolycrystal
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 13: Focus Issue: Intrinsic and Extrinsic Size Effects in Materials , 15 July 2019 , pp. 2263 - 2274
Copyright
Copyright © Materials Research Society 2019 

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