41 citations · 229 across the 27 of their papers we have counts for
19 papers · 1 filter
A Generalized Frank-Bilby Equation for Interfaces in Crystalline Materials
Dongsong Tao, Luchan Zhang, David J. Srolovitz +2
The classical Frank-Bilby equation (FBE) is commonly used to predict the structure of interfaces in crystalline materials in terms of interfacial dislocation networks. However, in…
A Continuum Model for Dislocation Climb
Chutian Huang, Shuyang Dai, Xiaohua Niu +4
Dislocation climb plays an important role in understanding plastic deformation of metallic materials at high temperature. In this paper, we present a continuum formulation for disl…
Stochastic Continuum Models for High--Entropy Alloys with Short-range Order
Yahong Yang, Luchan Zhang, Yang Xiang
High entropy alloys (HEAs) are a class of novel materials that exhibit superb engineering properties. It has been demonstrated by extensive experiments and first principles/atomist…
A Three-Dimensional Continuum Simulation Method for Grain Boundary Motion Incorporating Dislocation Structure
Xiaoxue Qin, Luchan Zhang, Yang Xiang
We develop a continuum model for the dynamics of grain boundaries in three dimensions that incorporates the motion and reaction of the constituent dislocations. The continuum model…
Continuum Model and Numerical Method for Dislocation Structure and Energy of Grain Boundaries
Xiaoxue Qin, Yejun Gu, Luchan Zhang +1
We present a continuum model to determine the dislocation structure and energy of low angle grain boundaries in three dimensions. The equilibrium dislocation structure is obtained…
Continuum model for dislocation structures of semicoherent interfaces
Luchan Zhang, Xiaoxue Qin, Yang Xiang
In order to relieve the misfitting elastic energy, the hetero-interfaces become semicoherent by forming networks of dislocations. These microscopic structures strongly influence th…
Phase field model for self-climb of prismatic dislocation loops by vacancy pipe diffusion
Xiaohua Niu, Yang Xiang, Xiaodong Yan
In this paper, we present a phase field model for the self-climb motion of prismatic dislocation loops via vacancy pipe diffusion driven by elastic interactions. This conserved dyn…
Stochastic Peierls-Nabarro Model for Dislocations in High Entropy Alloys
Tianpeng Jiang, Yang Xiang, Luchan Zhang
High entropy alloys (HEAs) are single phase crystals that consist of random solid solutions of multiple elements in approximately equal proportions. This class of novel materials h…
A New Formulation of Coupling and Sliding Motions of Grain Boundaries Based on Dislocation Structure
Luchan Zhang, Yang Xiang
A continuum model of the two dimensional low angle grain boundary motion and the dislocation structure evolution on the grain boundaries has been developed in Ref. [48]. The model…
A Continuum Multi-Disconnection-Mode Model for Grain Boundary Migration
Chaozhen Wei, Spencer L. Thomas, Jian Han +2
We study the Grain Boundary (GB) migration based on the underlying disconnection structure and mechanism. Disconnections are line defects that lie solely within a GB and are charac…
Dislocation dynamics formulation for self-climb of dislocation loops by vacancy pipe diffusion
Xiaohua Niu, Yejun Gu, Yang Xiang
It has been shown in experiments that self-climb of prismatic dislocation loops by pipe diffusion plays important roles in their dynamical behaviors, e.g., coarsening of prismatic…
The Role of Grain Boundaries under Long-Time Radiation
Yichao Zhu, Jing Luo, Xu Guo +2
Materials containing a high proportion of grain boundaries offer significant potential for the development of radiation-resistent structural materials. However, a proper understand…
Motion of grain boundaries incorporating dislocation structure
Luchan Zhang, Yang Xiang
In this paper, we present a continuum model for the dynamics of low angle grain boundaries in two dimensions based on the motion of constituent dislocations of the grain boundaries…
A continuum model for distributions of dislocations incorporating short-range interactions
Xiaohua Niu, Yichao Zhu, Shuyang Dai +1
Dislocations are the main carriers of the permanent deformation of crystals. For simulations of engineering applications, continuum models where material microstructures are repres…
Energy of low angle grain boundaries based on continuum dislocation structure
Luchan Zhang, Yejun Gu, Yang Xiang
In this paper, we present a continuum model to compute the energy of low angle grain boundaries for any given degrees of freedom (arbitrary rotation axis, rotation angle and bounda…
Dislocation climb models from atomistic scheme to dislocation dynamics
Xiaohua Niu, Tao Luo, Jianfeng Lu +1
We develop a mesoscopic dislocation dynamics model for vacancy-assisted dislocation climb by upscalings from a stochastic model on the atomistic scale. Our models incorporate micro…
Continuum dynamics of the formation, migration and dissociation of self-locked dislocation structures on parallel slip planes
Yichao Zhu, Xiaohua Niu, Yang Xiang
In continuum models of dislocations, proper formulations of short-range elastic interactions of dislocations are crucial for capturing various types of dislocation patterns formed…
A continuum model for dislocation dynamics in three dimensions using the dislocation density potential functions and its application in understanding the micro-pillar size effect
Yichao Zhu, Yang Xiang
In this paper, we present a dislocation-density-based three-dimensional continuum model, where the dislocation substructures are represented by pairs of dislocation density potenti…
Homogenisation of a Row of Dislocation Dipoles from Discrete Dislocation Dynamics
Stephen Jonathan Chapman, Yang Xiang, Yichao Zhu
Conventional discrete-to-continuum approaches have seen their limitation in describing the collective behaviour of the multi-polar configurations of dislocations, which are widely…