Title
The role of disclinations in two phase changes induced by temperature and pressure in crystalline solids: Melting and the brittle-ductile transitionThe role of disclinations in two phase changes induced by temperature and pressure in crystalline solids: Melting and the brittle-ductile transition
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Department of Physics
Publication type
article
Publication
London,
Subject
Physics
Chemistry
Source (journal)
Physics and chemistry of liquids. - London
Volume/pages
42(2004):5, p. 545-550
ISSN
0031-9104
ISI
000224560300008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
It has long been known that the melting temperature T-m of close-packed metals correlates well with the mono-vacancy 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.
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