Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 25, Issue 5, Pages 920-941Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2008.04.009
Keywords
Crystal plasticity; Dislocations; Grain boundaries; Stress relaxation; Polycrystalline material
Funding
- Ministry of education, culture, sports, science and technology [18062001]
- Grants-in-Aid for Scientific Research [18062001] Funding Source: KAKEN
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We compare experimental measurements of inhomogeneous plastic deformation in a Ni bicrystal with crystal plasticity simulations. Polychromatic X-ray microdiffraction, orientation imaging microscopy and scanning electron microscopy, were used to characterize the geometrically necessary dislocation distribution of the bicrystal after uniaxial tensile deformation. Changes in the local crystallographic orientations within the sample reflect its plastic response during the tensile test. Elastic strain in both grains increases near the grain boundary. Finite element simulations were used to understand the influence of initial grain orientation and structural inhomogeneities on the geometrically necessary dislocations arrangement and distribution and to understand the underlying materials physics. (C) 2008 Elsevier Ltd. All rights reserved.
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