Research of the crystal lattice rotation influence on the distribution of residual mesostresses using the model of inelastic deformation of polycrystals

2016 ◽  
Author(s):  
Evgeniy I. Ovchinnikov ◽  
Pavel S. Volegov
Keyword(s):  
Crystal Lattice ◽  
Inelastic Deformation ◽  
Lattice Rotation

Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

2004 ◽  
Vol 71 (5) ◽  
pp. 713-723 ◽  
Author(s):  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Crystal Lattice ◽  
Electron Backscatter Diffraction ◽  
Fem Analysis ◽  
Copper Sample ◽  
Laser Shock Peening ◽  
Lattice Rotation ◽  
Laser Shock ◽  
Shock Peening

Electron backscatter diffraction (EBSD) is used to investigate crystal lattice rotation caused by plastic deformation during high-strain rate laser shock peening in single crystal aluminum and copper sample on 110¯ and (001) surfaces. New experimental methodologies are employed which enable measurement of the in-plane lattice rotation under approximate plane-strain conditions. Crystal lattice rotation on and below the microscale laser shock peened sample surface was measured and compared with the simulation result obtained from FEM analysis, which account for single crystal plasticity. The lattice rotation measurements directly complement measurements of residual strain/stress with X-ray micro-diffraction using synchrotron light source and it also gives an indication of the extent of the plastic deformation induced by the microscale laser shock peening.

Periodic crystal lattice rotation in microband groups in a bcc metal

2007 ◽  
Vol 57 (8) ◽  
pp. 775-778 ◽  
Author(s):  
Dorothée Dorner ◽  
Yoshitaka Adachi ◽  
Kaneaki Tsuzaki
Keyword(s):  
Crystal Lattice ◽  
Lattice Rotation ◽  
Bcc Metal ◽  
Periodic Crystal

Multilevel Models of Polycrystalline Metals: Application for Cyclic Loading Description

2015 ◽  
Vol 243 ◽  
pp. 155-162
Author(s):  
Peter V. Trusov ◽  
Pavel S. Volegov ◽  
Alexey I. Shveykin ◽  
Dmitry S. Gribov
Keyword(s):  
Cyclic Loading ◽  
Inelastic Deformation ◽  
Multilevel Models ◽  
Constitutive Relations ◽  
General Structure ◽  
Pure Copper ◽  
Lattice Rotation ◽  
Physical Analysis ◽  
Polycrystalline Metals ◽  
Scale Levels

The general structure of multilevel models of polycrystalline inelastic deformation based on crystal plasticity and allow describing the evolution of materials internal structure is considered. It is assumed that crystallite inelastic deformation is realized by intragranular dislocation slipping and is accompanied by a lattice rotation. The paper focuses on the description of hardening laws formulated on the basis of physical analysis of defect structure elements interactions. To establish the connection between similar characteristics of different scale levels the consistency conditions of constitutive relations are used. Results of computational experiments on cyclic loading of representative volume of polycrystalline pure copper are obtained; it shows that proposed models allows to describe some effects of metals cyclic loading.

Shear Banding in Polycrystalline Aluminium and Copper Pre-Deformed by ECAP and Subsequently Plane Strain Compressed

2016 ◽  
Vol 716 ◽  
pp. 240-247
Author(s):  
Henryk Paul ◽  
Magdalena M. Miszczyk
Keyword(s):  
Crystal Lattice ◽  
Grain Boundaries ◽  
Texture Evolution ◽  
Shear Banding ◽  
Shear Bands ◽  
Shear Plane ◽  
Lattice Rotation ◽  
Pure Aluminium ◽  
Electron Backscattered Diffraction ◽  
Angular Pressing

The microstructure and texture evolution in commercially pure aluminium (AA1050 alloy) and copper have been characterized after change in strain path to elucidate the mechanisms of shear bands (SBs) formation and propagation across grain boundaries. Samples were pre-deformed in equal channel angular pressing (ECAP) and further compressed in a channel-die to form two sets of macro-SBs. The deformation-induced sub-structures and local changes in crystallographic orientations were characterized by scanning electron microscopy equipped with a high-resolution electron backscattered diffraction facility. It was found that the mechanism of micro-/macro-SBs formation is strictly crystallographic. In all the grains of the sheared zone a strong tendency to strain-induced re-orientation could be observed. Their crystal lattice rotated in such a way that one of the {111} slip planes became nearly parallel to the shear plane and the <011> (or <112>) direction became parallel to the direction of maximum shear. This crystal lattice rotation led to the formation of specific SBs components which facilitates slip propagation across grain boundaries without any visible variation in the slip direction.

Effect of Intergranular Interaction and Lattice Rotation on Predicted Residual Stress and Textures. Case of Austenite and Ferrite

2013 ◽  
Vol 772 ◽  
pp. 97-101
Author(s):  
Krzysztof Wierzbanowski ◽  
Marcin Wronski ◽  
Andrzej Baczmanski ◽  
Paul Lipiński ◽  
Brigitte Bacroix ◽  
...  
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Crystal Lattice ◽  
Basic Mechanism ◽  
Lattice Rotation ◽  
Polycrystalline Materials ◽  
Deformation Model ◽  
Anisotropic Behavior ◽  
Matrix Interaction ◽  
Definition Of

Rotation of grain crystal lattice is the basic mechanism of texture formation and of anisotropic behavior of metals during plastic deformation. The classical definition of crystal lattice rotation leads in some cases to different texture and residual stress predictions than the definition based on the orientation preservation of selected sample planes and/or directions. Also the intensity of grain-matrix interaction plays an important role in the prediction of the above quantities. These problems were studied using elasto-plastic deformation model of polycrystalline materials. Examples of austenite and ferrite steels were considered.

scholarly journals Statistical Crystal Plasticity Model Advanced for Grain Boundary Sliding Description

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 822
Author(s):  
Alexey Shveykin ◽  
Peter Trusov ◽  
Elvira Sharifullina
Keyword(s):  
Grain Boundary ◽  
Constitutive Model ◽  
Grain Boundaries ◽  
Crystal Plasticity ◽  
Inelastic Deformation ◽  
Grain Boundary Sliding ◽  
Lattice Rotation ◽  
Mutual Arrangement ◽  
Structural Level ◽  
Boundary Sliding

Grain boundary sliding is an important deformation mechanism, and therefore its description is essential for modeling different technological processes of thermomechanical treatment, in particular the superplasticity forming of metallic materials. For this purpose, we have developed a three-level statistical crystal plasticity constitutive model of polycrystalline metals and alloys, which takes into account intragranular dislocation sliding, crystallite lattice rotation and grain boundary sliding. A key advantage of our model over the classical Taylor-type models is that it also includes a consideration of grain boundaries and possible changes in their mutual arrangement. The constitutive relations are defined in rate form and in current configuration, which makes it possible to use additive contributions of intragranular sliding and grain boundary sliding to the strain rate at the macrolevel. In describing grain boundary sliding, displacements along the grain boundaries are considered explicitly, and changes in the neighboring grains are taken into account. In addition, the transition from displacements to deformation (shear) characteristics is done for the macrolevel representative volume via averaging, and the grain boundary sliding submodel is attributed to a separate structural level. We have also analyzed the interaction between grain boundary sliding and intragranular inelastic deformation. The influx of intragranular dislocations into the boundary increases the number of defects in it and the boundary energy, and promotes grain boundary sliding. The constitutive equation for grain boundary sliding describes boundary smoothing caused by diffusion effects. The results of the numerical experiments are in good agreement with the known experimental data. The numerical simulation demonstrates that analysis of grain boundary sliding has a significant impact on the results, and the multilevel constitutive model proposed in this study can be used to describe different inelastic deformation regimes, including superplasticity and transitions between conventional plasticity and superplasticity.

scholarly journals Evaluation of Crystal Lattice Rotation around a Stress-Induced Twin in a Step-Graded SiGe / Si (110) Using STEM Moiré Observation and its Image Analysis

2019 ◽  
Vol 25 (S2) ◽  
pp. 242-243
Author(s):  
Junji Yamanaka ◽  
Chiaya Yamamoto ◽  
Mai Shirakura ◽  
Kosuke O. Hara ◽  
Keisuke Arimoto ◽  
...  
Keyword(s):  
Image Analysis ◽  
Crystal Lattice ◽  
Lattice Rotation
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