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Diffraction-based misorientation mapping: A continuum mechanics description
- Source :
- Journal of the Mechanics and Physics of Solids. 133:103709
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- As the typical intragranular misorientation parameters, Kernel Averaged Misorientation (KAM) and Grain Reference Orientation Deviation (GROD) are widely used in diffraction-based misorientation mapping, while their evolution laws under various conditions and physical meanings in continuum mechanics description are rarely investigated systematically. Therefore, we designed several comparative experiments considering the influences of grain boundaries (single-crystalline vs. poly-crystalline), sample geometries (smooth vs. notched) and plastic strain modes (tension vs. buckling) on KAM & GROD evolution, and captured the intragranular misorientation, dislocation density, and material distortion synchronously based on coupled EBSD-ECCI-DIC mapping in this research. Meanwhile, we also discussed the physical meanings of KAM & GROD based on continuum mechanics description and provided the theoretical explanations to phenomena observed in the above experiments. KAM results from three in-surface invariants ( ρ GND I , ρ GND II & ρ GND III ) of GND density tensor ρGND induced by plastic strain distribution incompatible with the activated slip systems in unloaded elastic-plastic condition, which cause the same lattice curvature effects as three elastic strain modes with non-zero curl (buckling, in-surface bending & torsion) in purely elastic condition. GROD reflects neither local plastic strain nor local material rotation alone, but its “V-type” distribution near the neutral surface reflects the buckling curvature of single-crystal. Besides, KAM ¯ & GROD ¯ averaged over multiple grains can be used to estimate the nominal plastic strain applied in poly-crystal.
- Subjects :
- Physics
Misorientation
Continuum mechanics
Mechanical Engineering
Torsion (mechanics)
Geometry
02 engineering and technology
Plasticity
021001 nanoscience & nanotechnology
Condensed Matter Physics
Curvature
01 natural sciences
010305 fluids & plasmas
Mechanics of Materials
0103 physical sciences
Grain boundary
Dislocation
0210 nano-technology
Neutral plane
Subjects
Details
- ISSN :
- 00225096
- Volume :
- 133
- Database :
- OpenAIRE
- Journal :
- Journal of the Mechanics and Physics of Solids
- Accession number :
- edsair.doi...........c0942201bbd83dc76369fb8987bc5e8b
- Full Text :
- https://doi.org/10.1016/j.jmps.2019.103709