Assessment of geometrically necessary dislocation levels derived by 3D EBSD

被引：303

作者：

Konijnenberg, P. J. ^{[1
,2
]}

Zaefferer, S. ^{[1
]}

Raabe, D. ^{[1
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

[2] Bruker Nano GmbH, D-12489 Berlin, Germany

来源：

ACTA MATERIALIA | 2015年 / 99卷

关键词：

Microstructure; Geometrically necessary dislocations; Dislocation structure; 3D EBSD; Bending test; ELECTRON BACKSCATTER DIFFRACTION; ELASTIC STRAIN; RESOLUTION; DENSITY; DISTRIBUTIONS; PLASTICITY; GRADIENTS; ALUMINUM; COPPER;

D O I：

10.1016/j.actamat.2015.06.051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Existing alternatives for the calculation of geometrically necessary dislocation (GND) densities from orientation fields are discussed. Importantly, we highlight the role of reference frames and consider different sources of error. A well-controlled micro cantilever bending experiment on a copper bicrystal has been analyzed by 3-dimensional electron back scatter diffraction (3D EBSD). The GND density is determined experimentally by two different approaches and assessed theoretically, assuming a homogeneous bending of the cantilever. Experiment and theory agree very well. It is further shown that the deformation is accommodated mainly by GNDs, which carry and store lattice rotation, and not (only) by mobile dislocations that leave a crystal portion inspected, without lattice rotations. A detailed GND analysis reveals a local density minimum close to the grain boundary and a distinct difference in edge to screw ratios for both grains. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：402 / 414

页数：13

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