Recent progress in the phase-field dislocation dynamics method

S Xu - Computational Materials Science, 2022 - Elsevier
The phase-field dislocation dynamics (PFDD) method, originated in 2002, is a continuum
dislocation model that uses order parameters to describe dislocation slips in crystalline …

Phase transformations, fracture, and other structural changes in inelastic materials

VI Levitas - International Journal of Plasticity, 2021 - Elsevier
Review of selected fundamental topics on the interaction between phase transformations,
fracture, and other structural changes in inelastic materials is presented. It mostly focuses on …

The effect of local chemical ordering on Frank-Read source activation in a refractory multi-principal element alloy

LTW Smith, Y Su, S Xu, A Hunter, IJ Beyerlein - International Journal of …, 2020 - Elsevier
In this work, we investigate the operation of Frank-Read (FR) sources in a refractory multi-
principal element alloy (MPEA). Simulations of discrete dislocation motion in MPEAs is …

Local slip resistances in equal-molar MoNbTi multi-principal element alloy

S Xu, Y Su, WR Jian, IJ Beyerlein - Acta Materialia, 2021 - Elsevier
In this work, we calculate the local slip resistances (LSRs) in equal-molar MoNbTi multi-
principal element alloy via molecular static simulations. We consider dislocations of either …

Interaction of extended dislocations with nanovoid clusters

AM Roach, S Xu, DJ Luscher, DS Gianola… - International Journal of …, 2023 - Elsevier
Voids of nanoscale dimensions in irradiated metals can act as obstacles to dislocation
motion and cause strengthening. In this work, nanovoid strengthening and the influences of …

Role of layer thickness and dislocation distribution in confined layer slip in nanolaminated Nb

WR Jian, S Xu, Y Su, IJ Beyerlein - International Journal of Plasticity, 2022 - Elsevier
Confined layer slip (CLS) is considered as the primary mechanism for plastic deformation in
nanolaminates. It depicts the confined motion of a single dislocation between two parallel …

Frank-Read source operation in six body-centered cubic refractory metals

S Xu, Y Su, LTW Smith, IJ Beyerlein - Journal of the Mechanics and Physics …, 2020 - Elsevier
Abstract The Frank-Read (FR) source is a well-known intragranular dislocation source that
plays an important role in size-dependent dislocation multiplication in metallic crystals. In …

Atomistic calculations of the generalized stacking fault energies in two refractory multi-principal element alloys

S Xu, E Hwang, WR Jian, Y Su, IJ Beyerlein - Intermetallics, 2020 - Elsevier
In this work, we utilize atomistic simulations to calculate the generalized stacking fault
energies (GSFEs), which are related to the dislocation glide process, on four types of slip …

Phase-field modeling of the interactions between an edge dislocation and an array of obstacles

S Xu, JY Cheng, Z Li, NA Mara, IJ Beyerlein - Computer Methods in Applied …, 2022 - Elsevier
Obstacles, such as voids and precipitates, are prevalent in crystalline materials. They
strengthen crystals by serving as barriers to dislocation glide. In this work, we develop a …

Role of stacking fault energy in confined layer slip in nanolaminated Cu

W Ji, WR Jian, Y Su, S Xu, IJ Beyerlein - Journal of Materials Science, 2024 - Springer
Metallic nanolaminates exhibit superior strength compared to their coarsely laminated
counterparts. For layer thicknesses in the range of a few to tens of nanometers, the strength …