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Title
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The role of disclinations in two phase changes induced by temperature and pressure in crystalline solids: Melting and the brittle-ductile transition
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Physics and chemistry of liquids. - London
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Publication
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London
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2004
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ISSN
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0031-9104
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Volume/pages
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42
:5
(2004)
, p. 545-550
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ISI
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000224560300008
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Full text (Publisher's DOI)
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