Transfer and Incorporation of Dislocations to Σ3 Tilt Grain Boundaries under Uniaxial Compression
スポンサーリンク
概要
- 論文の詳細を見る
Microscopic yielding can be realized by the transfer of a dislocation across a grain boundary (GB), or by incorporation between the residual GB dislocation and the dislocations nucleated in the near-field of a GB due to the applied stress. These phenomena are determined by the crystallographic orientation and the multiaxial stress state around a GB. In the present paper, a new boundary interaction criterion of L- or L'-value is proposed, which considers both the contributions of the geometric relationship between two grains and a GB, and the stress state applied to the near-field of a GB. This value and the others so far proposed were calculated for <110>, <100>, and <111> symmetric tilt grain boundaries under uniaxial compression normal to the GB. The dynamic transfer and incorporation of the dislocations nucleated under uniaxial compression normal to the GB plane were then examined using 3-dimensional molecular dynamics simulations. Two kinds of <110> symmetric tilt boundaries of copper Σ3A and Σ3B were atomistically modeled. The individual reaction process between the dislocations nucleated from an artificial Frank-Read source introduced in one grain and a GB under uniaxial compression was resolved in detail. Combinations of the preferential slip systems across GBs were discussed in reference to the proposed boundary interaction criterion. The case of Σ3B with an easier slip transfer across a GB is identical to that predicted, while incorporation of the displacement shift complete (DSC) dislocation migrated on a Σ3A boundary plane complicates the defect reaction, necessitating a larger critical stress for slip transfer across a GB.
著者
-
Shibutani Yoji
Department Of Mechanical Engineering And Systems Osaka University
-
Tsuru Tomohito
Nuclear Science And Engineering Directorate Japan Atomic Energy Agency
-
HIROUCHI Tomoyuki
UACJ Co., Ltd.
関連論文
- Influence of Size and Number of Nanocrystals on Shear Band Formation in Amorphous Alloys
- Formation of Atomistic Island in Al Film Growth by Kinetic Monte Carlo
- Enhancement of Plasticity of Highly Density-Fluctuated Cu-Zr Amorphous Alloy
- MOLECULAR DYNAMICS STUDY ON DUCTILE CRACK PROCESS : Effect of Temperature on Dislocation Nucleation
- Effects of Atomic Deviatoric Distortion on Local Glass Transition of Metallic Glasses
- Minimum Energy Motion and Core Structure of Pure Edge and Screw Dislocations in Aluminum
- High-Pressure Elasticity and Auxetic Property of α-Cristobalite
- ATOMIC-LEVEL DESCRIPTION OF MATERIAL STRENGTH OF α-Fe(Special Issue on Hierarchical Estimations of Materials Strength)
- Effects of Atomic Size for Voronoi Tessellation Technique on Binary and Ternary Systems of Metallic Glasses
- Electronic Modification of C60 Monolayers via Metal Substrates
- Numerical Analysis for Acoustic Resonance of One-Dimensional Nonlinear Elastic Bar
- Computational Studies of Voltage in RF Magnetron Discharge
- Acoustic Resonance of a Two-Dimensional Isotropic Medium Studied Using Airy Stress Function (Special Issue : Ultrasonic Electronics)
- Low Temperature Elastic Constants and Piezoelectric Coefficients of LiNbO and LiTaO : Resonant Ultrasound Spectroscopy Measurement and Lattice Dynamics Analysis (Special Issue : Ultrasonic Electronics)
- MESOSCOPIC DYNAMICS ON DISLOCATION PATTERNING IN FATIGUED MATERIAL BY CELLULAR AUTOMATA(Special Issue on Hierarchical Estimations of Materials Strength)
- Thermodynamic properties of neptunium nitride : a first principles study
- Higher Accurate Estimation of Axial and Bending Stiffnesses of Plates Clamped by Bolts
- Formation of Prismatic Dislocation Loop around a Spherical Inclusion Using Level Set Dislocation Dynamics
- Non-Destructive Observations of Internal Micro-Defects Using Scanning Electron-Induced Acoustic Microscope
- Equivalent Stiffness Evaluations of Clamped Plates in Bolted Joints under Loading
- Modeling of Heteroepitaxial Thin Film Growth by Kinetic Monte Carlo
- Dislocation Nucleation and Interaction under Nanoindentation in Single Crystalline Al and Cu: Molecular Dynamics Simulations
- Large Deformability of 2D Framed Structures Connected by Flexible Joints
- Theoretical Investigation of the Displacement Burst Observed in Nanoindentation by Collective Dislocation Loops Nucleation Model
- Hybridized Atomistic Modeling of Migration Observed on Thin Film Surface by Incident Particles
- Transfer and Incorporation of Dislocations to Σ3 Tilt Grain Boundaries under Uniaxial Compression