Evolution of elastic heterogeneity during aging in metallic glasses

The properties of glasses vary widely depending on the way they are prepared, even though their structures appear similar. We show that the local potential energy landscape (PEL) sensitively reflects the stability differences through simulation of local structural excitation in a model metallic glas...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2014-06, Vol.89 (6), p.062313-062313, Article 062313
Main Authors: Fan, Yue, Iwashita, Takuya, Egami, Takeshi
Format: Article
Language:English
Subjects:
Computer Simulation
Copper - chemistry
Elasticity
Glass - chemistry
Kinetics
Metals - chemistry
Models, Chemical
Probability
Shear Strength
Thermodynamics
Zirconium - chemistry
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Summary:The properties of glasses vary widely depending on the way they are prepared, even though their structures appear similar. We show that the local potential energy landscape (PEL) sensitively reflects the stability differences through simulation of local structural excitation in a model metallic glass. It is observed that the spectrum of local structural excitation develops a pseudogap at low energies as the glass becomes more stable. We also demonstrate that the spatial variation of the atomic level shear modulus, rather than the distribution of the magnitude of the single atom shear modulus, is more closely related to the nature of the PEL and the stabilities of glasses. In particular, local aggregation of atoms with low shear modulus greatly contributes to instability of the system.
ISSN:1539-3755
1550-2376
DOI:10.1103/physreve.89.062313