Constitutive modeling of stress-driven grain growth in nanocrystalline metals
Type
ArticleKAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionMechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2013-02-08Online Publication Date
2013-02-08Print Publication Date
2013-03-01Permanent link to this record
http://hdl.handle.net/10754/594162
Metadata
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In this work, we present a variational multiscale model for grain growth in face-centered cubic nanocrystalline (nc) metals. In particular, grain-growth-induced stress softening and the resulting relaxation phenomena are addressed. The behavior of the polycrystal is described by a conventional Taylor-type averaging scheme in which the grains are treated as two-phase composites consisting of a grain interior phase and a grain boundary-affected zone. Furthermore, a grain-growth law that captures the experimentally observed characteristics of the grain coarsening phenomena is proposed. To this end, the grain size is not taken as constant and varies according to the proposed stress-driven growth law. Several parametric studies are conducted to emphasize the influence of the grain-growth rule on the overall macroscopic response. Finally, the model is shown to provide a good description of the experimentally observed grain-growth-induced relaxation in nc-copper. © 2013 IOP Publishing Ltd.Citation
Gürses E, Wafai H, Sayed TE (2013) Constitutive modeling of stress-driven grain growth in nanocrystalline metals. Modelling Simul Mater Sci Eng 21: 025011. Available: http://dx.doi.org/10.1088/0965-0393/21/2/025011.Sponsors
This work was funded by KAUST baseline funds.Publisher
IOP Publishingae974a485f413a2113503eed53cd6c53
10.1088/0965-0393/21/2/025011