Finite-temperature dislocation interactions
نویسندگان
چکیده
منابع مشابه
Harnessing atomistic simulations to predict the rate at which dislocations overcome obstacles
Predicting the rate at which dislocations overcome obstacles is key to understanding the microscopic features that govern the plastic flow of modern alloys. In this spirit, the current manuscript examines the rate at which an edge dislocation overcomes an obstacle in aluminum. Predictions were made using different popular variants of Harmonic Transition State Theory (HTST) and compared to those...
متن کاملDurcissement des superalliages monocristallins: des mécanismes physiques à la modélisation continue - Strength of single crystal superalloys: from dislocation mechanisms to continuum micromechanics
The present work deals with crystal plasticity of single crystal nickel-base superalloys. In this context, a scale transition of transferring information from mesoscale towards a physically justified micromechanical model is shown. A numerical coupling between dislocation dynamic simulations and the finite element method, the socalled Discrete-Continuous Model (DCM) is used in order to take int...
متن کاملDislocation Interactions with Thermal Phonons and Conduction Electrons
Experimental methods for the measurement of intrinsic interactions between moving dislocations and the crystal lattice are considered. It is emphasized that the stress pulse method is applicable at stress levels greater than about twice the static flow stress, while internal friction experiments may be used to explore the interaction at very low stress levels and small dislocation velocities. R...
متن کاملTHEORETICAL AND EXPERIMENTAL EVALUATION OF DISLOCATION DENSITY IN A WORKPIECE AFTER FORMING
Abstract: The theoretical calculation of dislocation density in different regions of a deformed workpiece of 99.99% pure copper has been carried out using different procedures consisting of Finite Element Method (FEM) and hardness measurement. To assess the validity of the results pertaining to these procedures, the dislocation density is experimentally measured utilizing the Differential...
متن کاملComputer simulations of two-dimensional melting with dipole-dipole interactions.
We perform molecular dynamics and Monte Carlo simulations of two-dimensional melting with dipole-dipole interactions. Both static and dynamic behaviors are examined. In the isotropic liquid phase, the bond orientational correlation length xi 6 and susceptibility chi 6 are measured, and the data are fitted to the theoretical ansatz. An algebraic decay is detected for both spatial and temporal bo...
متن کامل