Results 11 to 20 of about 15,379 (289)
Viewpoint: experimental recovery of geometrically necessary dislocation density in polycrystals
Scripta Materialia, 2003 Abstract Application of electron backscattering diffraction methods to recover estimates of the geometrically necessary dislocation density is described. The limitations of the method arising from the opacity of crystalline materials and the spatial and angular resolution limits are discussed.
B. El-dasher, B. Adams, A. Rollett
semanticscholar +5 more sources
Journal of the Mechanics and Physics of Solids, 2017 Abstract An aluminum bicrystal with a symmetric tilt Σ43 (3 3 5)[1 1 0] coincident site lattice grain boundary was deformed plastically via wedge indentation under conditions that led to a plane strain deformation state. Plastic deformation is induced into both crystals and the initially straight grain boundary developed a significant curvature.
C. Dahlberg +3 more
semanticscholar +4 more sources
Ultramicroscopy, 2013 Recent advances using cross-correlation analysis of full resolution high quality electron backscatter diffraction (EBSD) patterns have provided a method for quantitatively mapping the stored dislocation density at high spatial resolution. Larger areas could be mapped with image binning or coarser step sizes. We have studied the effects of image binning
Jun Jiang, T. B. Britton, A. Wilkinson
semanticscholar +6 more sources
Crystals, 2023 This study focused on the analysis of geometrically necessary dislocation (GND) densities for five selected fine-grained magnesium samples. Among the samples, three were tested under different fatigue-loading conditions at 0 °C, one experienced quasi ...
Qizhen Li
doaj +2 more sources
Geometrically necessary dislocation density distributions in cyclically deformed Ti–6Al–4V
Acta Materialia, 2012 Abstract Cross-correlation-based electron backscattering diffraction analysis has been used to map lattice rotations in Ti–6Al–4V polycrystals deformed by load-controlled fatigue and dwell fatigue including a hold at maximum load. The lattice curvatures were used to form lower bound estimates of the geometrically necessary dislocation (GND) density ...
P. Littlewood, A. Wilkinson
semanticscholar +2 more sources
Graded Brittle–Ductile Transition via Laser-Induced Thermal Gradient for Broaching of Z10C13 Steel [PDF]
MicromachinesThis paper presents a breakthrough in activating the skin effect at conventional broaching speeds (1–8 m/min) by using laser defocus gradient modification to induce surface embrittlement in martensitic stainless steel Z10C13.
Guozhen Liu +6 more
doaj +2 more sources
Geometrically necessary dislocation density distributions in Ti–6Al–4V deformed in tension
Acta Materialia, 2011 Abstract We have used cross-correlation-based analysis of electron backscatter diffraction patterns to map lattice rotations in polycrystalline samples of Ti–6Al–4V before and after moderate (6%) tensile deformation. The sensitivity is improved compared to conventional Hough-based indexing and allows the density of geometrically necessary ...
P. Littlewood +2 more
semanticscholar +2 more sources
Subgrain geometrically necessary dislocation density mapping in spalled Ta in three dimensions
Acta Materialia, 2022 Wyatt A. Witzen +4 more
semanticscholar +2 more sources
Acta Materialia, 2012 We have examined the interaction of a blocked slip band and a grain boundary in deformed titanium using high-resolution electron backscatter diffraction and atomic force microscopy.
T. B. Britton, A. Wilkinson
semanticscholar +4 more sources