Phase-field Simulation of Void Migration in a Temperature Gradient

Journal Article · Sat May 01 04:00:00 EDT 2010 · Acta materialia, 58(9):3230-3237

DOI:https://doi.org/10.1016/j.actamat.2010.01.043· OSTI ID:982554

Hu, Shenyang Y; Henager, Charles H

We present a phase-field model that simulates vacancy diffusion in a solid with a strong inhomogeneity of vacancy mobility, which is used to study void migration via bulk and surface diffusion in a temperature gradient. The simulation results demonstrate that voids migrate up the temperature gradient and the migration velocity varies inversely with the void size in agreement with theory. The simulations also show the capability of the developed model for investigating the effect of surface diffusion, temperature gradient, and vacancy concentration on the void migration velocity and which are shown in this study. A potential application of the model is shown in studying the kinetics of the void migration and the formation of central hole in the nuclear fuels.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 982554
• Report Number(s): PNNL-SA-65490
• Journal Information: Acta materialia, 58(9):3230-3237, Journal Name: Acta materialia, 58(9):3230-3237 Journal Issue: 9 Vol. 58; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
DIFFUSION
KINETICS
NUCLEAR FUELS
SIMULATION
TEMPERATURE GRADIENTS
VELOCITY
Vacancy
void migration
microstructure evolution
temperature gradient
Phase-field model
nuclear fuel