Abstract
It is believed that the failure mode of metal nanowires under tensile loading is the result of the nucleation and propagation of dislocations. Such failure modes can be slip, partial slip or twinning and therefore they are regarded as local deformation. Here we provide numerical and theoretical evidences to show that global deformation is another predominant failure mode of nanowires under tensile loading. At the global deformation mode, nanowires fail with a large contraction along a lateral direction and a large expansion along the other lateral direction. In addition, there is a competition between global and local deformations. Nanowires loaded at low temperature exhibit global failure mode first and then local deformation follows later. We show that the global deformation originates from the intrinsic instability of the nanowires and that temperature is a main parameter that decides the global or local deformation as the failure mode of nanowires.
Highlights
Mechanical responses of metal nanowires have been extensively studied since they show unusual behaviors such as very large elastic range and higher elastic moduli compared to their bulk counterparts
The basic mechanism of the global failure mode can be explained by the elastic instability theory that was originally developed by Born[14], and improved by Hill and Milstein[15,16] and others[17,18,19]
The face-centered-cubic (FCC) (001) nanowires of seven metals were modelled with embedded atom method (EAM) potentials[20,21,22]
Summary
Nanowires: Global Deformation received: 08 March 2015 accepted: 13 May 2015 Published: 18 June 2015 versus Local Deformation. It is believed that the failure mode of metal nanowires under tensile loading is the result of the nucleation and propagation of dislocations. Such failure modes can be slip, partial slip or twinning and they are regarded as local deformation. We provide numerical and theoretical evidences to show that global deformation is another predominant failure mode of nanowires under tensile loading. Most predominant origin of local deformations that makes nanowires fail is the nucleation and propagation of dislocations. We find that there is a competition between local and global deformations and that temperature is a primary parameter which decides the failure mode of nanowires. The basic mechanism of the global failure mode can be explained by the elastic instability theory that was originally developed by Born[14], and improved by Hill and Milstein[15,16] and others[17,18,19]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
