Strain field due to a slip band near a grain boundary in an Fe-6at.% Si bicrystal. III. Simulation of the orientation contrast

1991 ◽  
Vol 24 (4) ◽  
pp. 331-339 ◽  
Author(s):  
M. Polcarová ◽  
J. Gemperlová ◽  
J. Brádler
Keyword(s):  
Grain Boundary ◽  
Slip Band ◽  
Strain Field ◽  
Orientation Contrast

Roughening and strain-field evolution at a grain boundary in α−Al2O3

2018 ◽  
Vol 2 (11) ◽  
Author(s):  
Sung Bo Lee ◽  
Seung-Yong Lee ◽  
Seung Jo Yoo ◽  
Yoonkoo Kim ◽  
Jin-Gyu Kim ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Strain Field ◽  
Field Evolution ◽  
Α Al2o3

Effect of Grain Boundary Energy Anisotropy on Faceting and Migration of Low Angle Grain Boundaries

2014 ◽  
Vol 783-786 ◽  
pp. 1634-1639
Author(s):  
Dmitri A. Molodov ◽  
Jann Erik Brandenburg ◽  
Luis Antonio Barrales-Mora ◽  
Günter Gottstein
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Elevated Temperatures ◽  
Boundary Energy ◽  
Migration Behavior ◽  
Grain Boundary Energy ◽  
Contrast Imaging ◽  
Orientation Contrast ◽  
And Migration ◽  
Twist Boundaries

The faceting and migration behavior of low angle <100> grain boundaries in high purity aluminum bicrystals was investigated. In-situ technique based on orientation contrast imaging was applied. In contrast to the pure tilt boundaries, which remained straight/flat and immobile during annealing at elevated temperatures, mixed tilt-twist boundaries readily assumed a curved shape and steadily moved under the capillary force. Computational analysis revealed that this behavior is due to the inclinational anisotropy of grain boundary energy, which in turn depends on boundary geometry – the energy of pure tilt low angle <100> boundaries is anisotropic, whereas that of mixed tilt-twist boundaries isotropic with respect to boundary inclination.

The stress-driven redistribution of point defects in the vicinity of crack-like singularities

1990 ◽  
Vol 427 (1872) ◽  
pp. 1-23 ◽  
Keyword(s):  
Steady State ◽  
Stress Field ◽  
Grain Boundary ◽  
Point Defect ◽  
Slip Band ◽  
Point Defects ◽  
Elastic Interaction ◽  
Mode Ii ◽  
Fracture Of Materials ◽  
Kinetics Of

The most important term in the energy of the elastic interaction between a crack and a point defect is presented and used to estimate the kinetics of redistribution of point defects in the stress field of an isolated crack under mode II load and a slip band impinging against a grain boundary sink. Our analyses show that the point defects should migrate only to the tip of the crack, whereas they should enter both into the slip band tip and along the adjacent boundary interface. Explicit results are obtained for the concentrations, the number and flux distributions as well as the total numbers segregated in the transient depletion and the steady-state irradiation situation and serve to reinforce previous conclusions regarding the importance of such stress-driven processes in the fracture of materials.

scholarly journals A quantitative study of stress fields ahead of a slip band blocked by a grain boundary in unalloyed magnesium

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mohsen Taheri Andani ◽  
Aaditya Lakshmanan ◽  
Mohammadreza Karamooz-Ravari ◽  
Veera Sundararaghavan ◽  
John Allison ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Slip Band ◽  
Quantitative Study ◽  
Stress Fields

Structural Dependence of Grain Boundary Energy in Fe-Based Polycrystals Identified by OIM Measurements

2007 ◽  
Vol 550 ◽  
pp. 411-416
Author(s):  
Patricia Gobernado ◽  
Leo Kestens
Keyword(s):  
Grain Boundary ◽  
Boundary Energy ◽  
Initial Boundary ◽  
Geometrical Configuration ◽  
Grain Boundary Energy ◽  
Triple Junctions ◽  
High Angle ◽  
Orientation Contrast ◽  
Contrast Microscopy ◽  
Two Parameter

The (relative) grain boundary energy of random high angle boundaries has been measured in several Fe-based polycrystals. Crystallographic data obtained by orientation contrast microscopy (OIM) are combined with the geometrical configuration of grain boundaries at triple junctions. A two-parameter representation of the relative grain boundary energy in terms of misorientation angle and misorientation axis is presented. In the applied procedure a variation of the energy values assigned to one boundary was observed depending on the triangulation path chosen by the operator to connect the arbitrary initial boundary with the boundary under consideration. Results show no evidence of correspondence between the observed energy cusps and the presence of CSL boundaries.

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