Glass Transition by Gelation in a Phase Separating Binary Alloy

Autor:	Michael J. Demkowicz, Richard Baumer
Rok vydání:	2013
Předmět:	Condensed Matter::Soft Condensed Matter Colloid Molecular dynamics Materials science Amorphous metal Icosahedral symmetry Phase (matter) Binary alloy General Physics and Astronomy Shear resistance Thermodynamics Glass transition Condensed Matter::Disordered Systems and Neural Networks
Zdroj:	Physical Review Letters. 110
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.110.145502
Popis:	We use molecular dynamics simulations to show that glass transition in a model phase separating amorphous alloy, ${\mathrm{Cu}}_{50}{\mathrm{Nb}}_{50}$, 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d4633c0fbaecc8811bb2d25879eb453 https://doi.org/10.1103/physrevlett.110.145502 Zobrazit plný text záznamu