Is the brittle–ductile transition preceding melting related to 5- and 7-membered ring defects in graphite? Academic Article

abstract

• The brittle-ductile transition (BDT) is a very general phenomenon in materials science. The temperature TBDT in numerous materials correlates somewhat with the higher melting temperature Tm. We have earlier proposed the disclination (or rotation-dislocation) as a universal ingredient in the BDT. The present study is exclusively concerned with graphite, where Tm ≈ 4000 K. Our conclusion is that the energetics of 5- and 7-membered rings play a crucial role in determining these temperatures. However, experiment is to be invoked, should TBDT eventually be measured for graphite, so as to decide between various mechanisms, all of which here depend on 5- and 7-membered rings. One mechanism involves interlayer van der Waals coupling, whence a pressure experiment may hold the key.

authors

• Klein, Douglas

published proceedings

• PHYSICS AND CHEMISTRY OF LIQUIDS

author list (cited authors)

• Klein, D. J., & March, N. H.

citation count

• 3

complete list of authors

• Klein, DJ||March, NH

publication date

• December 2007

publisher

• Taylor & Francis  Publisher

published in

• Physics and Chemistry of Liquids  Journal

keywords

• Brittle-ductile Transition
• Disclinations
• Dislocations
• Graphite
• Melting

Digital Object Identifier (DOI)

• 10.1080/00319100701491163

start page

• 609

end page

• 613

volume

• 45

issue

• 6

URL

• http://dx.doi.org/10.1080/00319100701491163