title: Evolution of elastic heterogeneity during aging in metallic glasses.
abstract: 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.
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: Yue
authors.initials: Y
authors.lastname: Fan
authors.affiliation: Department of Physics and Astronomy, Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: Takuya
authors.initials: T
authors.lastname: Iwashita
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Egami
mesh_terms: D003198:Computer Simulation; D003300:Copper / Q000737:chemistry; D004548:Elasticity; D005898:Glass / Q000737:chemistry*; D007700:Kinetics; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D011336:Probability; D033081:Shear Strength; D013816:Thermodynamics; D015040:Zirconium / Q000737:chemistry
chemical_list: D008670:Metals; D003300:Copper; D015040:Zirconium