The role of disclinations in two phase changes induced by temperature and pressure in crystalline solids: Melting and the brittle-ductile transition

abstract

• It has long been known that the melting temperature Tm of close-packed metals correlates well with the monovacancy formation energy. However, with the possible exception of the face-centered-cubic metals, there is a prior phase transition from a mechanically brittle solid phase to a ductile phase. Here the likely role of disclinations in the brittle-ductile phase change is stressed. The present picture may help to understand the brittle-ductile transition not only in crystalline materials but also in amorphous phases. The structure of such phases can probably be characterized in terms of a disordered disclination network. As examples of elemental crystalline solids, Si and graphite are finally discussed, with the melting under pressure of graphite being quantified. 2004 Taylor and Francis Ltd.

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

• October 2004

publisher

• Taylor & Francis  Publisher

published in

• Physics and Chemistry of Liquids  Journal

keywords

• Brittle-ductile Transition
• Disclinations
• Melting

Digital Object Identifier (DOI)

• 10.1080/003191004123312732415

start page

• 545

end page

• 550

volume

• 42

issue

• 5

URL

• http://dx.doi.org/10.1080/003191004123312732415