Void Growth in BCC Metals Simulated with Molecular Dynamics using the Finnis-Sinclair Potential

Details Void Growth in BCC Metals Simulated with Molecular Dynamics using the Finnis-Sinclair Potential Void Growth in BCC Metals Simulated with Molecular Dynamics using the Finnis-Sinclair Potential

2009-06-02

arxiv.org/abs/0906.0619v1

Physics

Condensed Matter

Materials Science

24 pages, 12 figures

Scientific paper

The process of fracture in ductile metals involves the nucleation, growth, and linking of voids. This process takes place both at the low rates involved in typical engineering applications and at the high rates associated with dynamic fracture processes such as spallation. Here we study the growth of a void in a single crystal at high rates using molecular dynamics (MD) based on Finnis-Sinclair interatomic potentials for the body-centred cubic (bcc) metals V, Nb, Mo, Ta, and W. The use of the Finnis-Sinclair potential enables the study of plasticity associated with void growth at the atomic level at room temperature and strain rates from 10^9/s down to 10^6/s and systems as large as 128 million atoms. The atomistic systems are observed to undergo a transition from twinning at the higher end of this range to dislocation flow at the lower end. We analyze the simulations for the specific mechanisms of plasticity associated with void growth as dislocation loops are punched out to accommodate the growing void. We also analyse the process of nucleation and growth of voids in simulations of nanocrystalline Ta expanding at different strain rates. We comment on differences in the plasticity associated with void growth in the bcc metals compared to earlier studies in face-centred cubic (fcc) metals.

Affiliated with

Also associated with

No associations

Rating

Void Growth in BCC Metals Simulated with Molecular Dynamics using the Finnis-Sinclair Potential does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Void Growth in BCC Metals Simulated with Molecular Dynamics using the Finnis-Sinclair Potential, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Void Growth in BCC Metals Simulated with Molecular Dynamics using the Finnis-Sinclair Potential will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-193425