A Molecular Dynamics Simulation of Fracture in Nanocrystalline Copper

Authors: Lin Qing Pei, Cheng Lu, Kiet Tieu, Hong Tao Zhu, Xing Zhao, Kui Yu Cheng, Liang Zhang

 

Abstract: A large-scale molecular dynamics simulation was used to investigate the propagation of cracks in three dimensional samples of nanocrystalline copper, with average grain sizes ranging from 5.34 to 14.8 nm and temperatures ranging from 1K to 500 K. It was shown that intragranular fracture can proceed inside the grain at low temperature, and plastic deformation around the tip of the crack is accommodated by dislocation nucleation/emission; indeed, both fully extended dislocation and deformation twinning were visible around the tip of the crack during fracture. In addition, due to a higher concentration of stress in front of the crack at a relative lower temperature, it was found that twinning deformation is easier to nucleate from the tip of the crack. These results also showed that the decreasing grain size below a critical value exhibits a reverse Hall-Petch relationship due to the enhancing grain boundary mediation, and high temperature is better for propagating ductile cracks.

 

Direct link: http://www.scientific.net/JNanoR.25.188

Views: 66

Comment

You need to be a member of The International NanoScience Community to add comments!

Join The International NanoScience Community

Welcome - about us

Welcome! Nanopaprika was cooked up by Hungarian chemistry PhD student in 2007. The main idea was to create something more personal than the other nano networks already on the Internet. Community is open to everyone from post-doctorial researchers and professors to students everywhere.

There is only one important assumption: you have to be interested in nano!

Nanopaprika is always looking for new partners, if you have any idea, contact me at editor@nanopaprika.eu

Dr. András Paszternák, founder of Nanopaprika

Partner network:

Next partner events of TINC

We are Media Partner of:

Badge

Loading…

© 2019   Created by András Paszternák, PhD (founder).   Powered by

Badges  |  Report an Issue  |  Terms of Service