Linked Life Data

19416913

Source:http://linkedlifedata.com/resource/pubmed/id/19416913

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
19
pubmed:dateCreated
2009-5-13
pubmed:abstractText
Polycrystalline materials are composites of crystalline particles or "grains" separated by thin "amorphous" grain boundaries (GBs). Although GBs have been exhaustively investigated at low temperatures, at which these regions are relatively ordered, much less is known about them at higher temperatures, where they exhibit significant mobility and structural disorder and characterization methods are limited. The time and spatial scales accessible to molecular dynamics (MD) simulation are appropriate for investigating the dynamical and structural properties of GBs at elevated temperatures, and we exploit MD to explore basic aspects of GB dynamics as a function of temperature. It has long been hypothesized that GBs have features in common with glass-forming liquids based on the processing characteristics of polycrystalline materials. We find remarkable support for this suggestion, as evidenced by string-like collective atomic motion and transient caging of atomic motion, and a non-Arrhenius GB mobility describing the average rate of large-scale GB displacement.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
May
pubmed:issn
1091-6490
pubmed:author
pubmed:issnType
Electronic
pubmed:day
12
pubmed:volume
106
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
7735-40
pubmed:dateRevised
2010-9-27
pubmed:year
2009
pubmed:articleTitle
Grain boundaries exhibit the dynamics of glass-forming liquids.
pubmed:affiliation
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada T6G 2V4.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.