Glass transition by gelation in a phase separating binary alloy

We use molecular dynamics simulations to show that glass transition in a model phase separating amorphous alloy, Cu(50)Nb(50), occurs by gelation. At the glass transition, a mechanically stiff, percolating network of atoms with icosahedral local packing forms at the interfaces between compositionall...

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Veröffentlicht in:	Physical review letters 2013-04, Vol.110 (14), p.145502-145502, Article 145502
Hauptverfasser:	Baumer, R E, Demkowicz, M J
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Sprache:	eng
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creator	Baumer, R E Demkowicz, M J
description	We use molecular dynamics simulations to show that glass transition in a model phase separating amorphous alloy, Cu(50)Nb(50), occurs by gelation. At the glass transition, a mechanically stiff, percolating network of atoms with icosahedral local packing forms at the interfaces between compositionally enriched regions. This low-energy network halts coarsening of the phase-separated structure and imparts shear resistance. These features of glass transition are remarkably similar to gelation processes in polymeric and colloidal gels.
doi_str_mv	10.1103/physrevlett.110.145502
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title	Glass transition by gelation in a phase separating binary alloy
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