Investigation of the evolution of Geometrically Necessary Dislocation (GND) tensor in a type 316 steel by using in-situ EBSD technique

2021 ◽  
Vol 286 ◽  
pp. 129254
Author(s):  
Xiao Wang ◽  
Zhengqing Zhou ◽  
Sheng Liu ◽  
Mingyu Huang
Keyword(s):  
Geometrically Necessary Dislocation ◽  
Ebsd Technique

scholarly journals Coexistence of multi-deformation modes in beta Ti alloys with improved yielding strength and ductility

2020 ◽  
Vol 321 ◽  
pp. 11069
Author(s):  
Guanfang Chen ◽  
Jinyong Zhang ◽  
Yangyang Fu ◽  
Zheng Chen ◽  
Fan Sun ◽  
...  
Keyword(s):  
Mechanical Twinning ◽  
Dislocation Glide ◽  
Ti Alloys ◽  
Martensitic Phase Transformations ◽  
Ebsd Technique ◽  
Deformation Modes ◽  
Novel Design ◽  
Strain Hardening Rate ◽  
Strength And Ductility

By suppressing SIM (stress induced martensitic) phase transformations, a strong and ductile beta TWIP (twinning induced plasticity) Ti-Mo based alloy was achieved, thanking to the coexistence of mechanical twinning ({112}<111> mode and {332} <113> mode) and dislocation glide. The alloy displayed extra high yielding stress, stable strain-hardening rate and adequate ductility. In-situ traction/EBSD technique and TEM characterizations were employed to investigate the plastic deformation mechanism. The dislocation slipping was mediated by bimodal twinning mechanism, composed by high density nano-scale {112} twinning in micro {332} twinning grid. The study aims to exploit novel design strategy for strengthening ductile TWIP Ti alloys, attributed to multimodal twinning effects.

scholarly journals Evaluation of the reliability of twin variant analysis in Mg alloys by in situ EBSD technique

2019 ◽  
Vol 7 (2) ◽  
pp. 258-263 ◽  
Author(s):  
Feiya Liu ◽  
Changfa Guo ◽  
Renlong Xin ◽  
Guilin Wu ◽  
Qing Liu
Keyword(s):  
Mg Alloys ◽  
Twin Variant ◽  
Variant Analysis ◽  
Ebsd Technique

Electrodeposited Nanocrystalline Ni-Fe with Banded Structure

2012 ◽  
Vol 706-709 ◽  
pp. 1618-1623 ◽  
Author(s):  
Uta Klement ◽  
Mehrdad Shahabi-Navid ◽  
Glenn D. Hibbard
Keyword(s):  
Grain Growth ◽  
Electron Backscatter Diffraction ◽  
Growth Direction ◽  
Phase Changes ◽  
Growth Behaviour ◽  
General Behaviour ◽  
Banded Structure ◽  
Ebsd Technique ◽  
Backscatter Diffraction

The microstructure of a Ni–18 wt.% Fe electrodeposits having a banded structure is described in detail. The aim is to investigate the influence of the banded structure on grain growth behaviour and texture and to elucidate if there are other mechanisms operative in the stabilization of nanocrystalline electrodeposits. Spectroscopy techniques have been used to characterize the variations in alloy/impurity concentration perpendicular to the growth direction. The influence of these chemical variations on the microstructural evolution has been monitored by in-situ annealing treatments in the TEM. Local texture of the annealed material has been determined by use of the electron backscatter diffraction (EBSD) technique. SEM and TEM investigations have shown that the banded structure is not related to phase changes and that grain growth is not affected by the banded structure, i.e. there is no preferred growth along bands. The first grown grains have <100>, <112> and <111> orientations with the growth direction and upon further grain growth a <111> fibre texture with respect to the growth direction of the electrodeposits is formed. The banded structure seems not to affect the general behaviour of nanocrystalline electrodeposits.

Tracing the recrystallization of warm temper-rolled Fe–6.5 wt% Si non-oriented electrical steel using a quasi in situ EBSD technique

2020 ◽  
Vol 55 (36) ◽  
pp. 17183-17203
Author(s):  
Haijie Xu ◽  
Yunbo Xu ◽  
Youliang He ◽  
Steve Yue ◽  
Jianping Li
Keyword(s):  
Electrical Steel ◽  
Ebsd Technique

Strain-Induced Selective Growth in 1.5% Temper-Rolled Fe∼1%Si

2011 ◽  
Vol 17 (3) ◽  
pp. 362-367 ◽  
Author(s):  
Tricia A. Bennett ◽  
Peter N. Kalu ◽  
Anthony D. Rollett
Keyword(s):  
Electron Backscatter Diffraction ◽  
Selective Growth ◽  
Stored Energy ◽  
Grain Sizes ◽  
Geometrically Necessary Dislocation ◽  
Electron Backscatter ◽  
Ebsd Technique ◽  
Backscatter Diffraction ◽  
Dislocation Content

AbstractStrain-induced selective growth was investigated in a 1.5% temper-rolled Fe∼1%Si alloy using the electron backscatter diffraction (EBSD) technique. The EBSD technique was used to quantify the presence of orientation spreads within grains and to show that this particular case of selective growth can be directly related to differences in stored energy as reflected in the geometrically necessary dislocation content. The differences in stored energy were sufficient to give rise to selective growth as evidenced by bi-modal grain sizes.

In-Situ Electromigration Damage of Al Interconnect Lines and the Influence of Grain Orientation

1999 ◽  
Vol 563 ◽  
Author(s):  
A. Buerke ◽  
H. Wendrock ◽  
T. KÖtter ◽  
S. Menzel ◽  
K. Wetzig ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Grain Orientation ◽  
Local Orientation ◽  
Boundary Map ◽  
Diffusion Paths ◽  
Bamboo Structure ◽  
Ebsd Technique ◽  
Interconnect Lines ◽  
Current Loading

AbstractIn this work the authors want to report some experiments concerning unpassivated Al interconnect lines of 8 and 1.4 microns width which have been damaged by in-situ electromigration in the SEM (temperature 230°C, current density 2 and 4×106 A/cm2, respectively). The wider line represents a polygrained structure with few blocking grains spanning the whole width, whereas the narrow line shows bamboo structure. Before electromigration, the local orientation and thus the position of all grain boundaries was mapped by EBSD technique along the entire interconnect line. During and after in-situ current loading in the SEM, the damaged sites were correlated with the grain boundary map to locate where the diffusion paths are situated most likely. It was found that not the deviation from <111> fibre texture, but the misorientation class of the grain boundaries is essential for the localization of the fatal defects.

Local Orientation Gradient and Recrystallization of Deformed Copper

2005 ◽  
Vol 105 ◽  
pp. 157-162 ◽  
Author(s):  
David P. Field ◽  
Matthew M. Nowell ◽  
P. Trivedi ◽  
Stuart I. Wright ◽  
T.M. Lillo
Keyword(s):  
Equal Channel Angular Extrusion ◽  
Pure Copper ◽  
Structural Features ◽  
Nucleation And Growth ◽  
Boundary Structure ◽  
Orientation Gradient ◽  
Grain Boundary Structure ◽  
Ebsd Technique

The texture and grain boundary structure of recrystallized materials is dependent upon the character of the deformed matrix, and the selective nucleation and growth of crystallites from the deformation structure. Proper description of the deformed matrix includes not only local crystallite lattice orientation, but also dislocation content and gradients in structural features that contribute to the heterogeneity of the nucleation and growth processes. In-situ recrystallization experiments were performed on pure copper deformed by equal channel angular extrusion, and characterization of the structure on the surface of bulk specimens was accomplished using the EBSD technique. The character of the structure where nucleation preferentially occurs is presumed to be in heavily deformed regions as nuclei were first observed in such microstructures. Grain growth is observed to be heavily dependent upon twinning processes.

A study on the annealing behavior of Cu-added bake-hardenable steel using an in situ EBSD technique

2014 ◽  
Vol 68 ◽  
pp. 9-18 ◽  
Author(s):  
D.-I. Kim ◽  
J.S. Kim ◽  
J.H. Kim ◽  
S.-H. Choi
Keyword(s):  
Annealing Behavior ◽  
Ebsd Technique
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