title: Strain induced fragility transition in metallic glass.
abstract: Relaxation dynamics are the central topic in glassy physics. Recently, there is an emerging view that mechanical strain plays a similar role as temperature in altering the relaxation dynamics. Here, we report that mechanical strain in a model metallic glass modulates the relaxation dynamics in unexpected ways. We find that a large strain amplitude makes a fragile liquid become stronger, reduces dynamical heterogeneity at the glass transition and broadens the loss spectra asymmetrically, in addition to speeding up the relaxation dynamics. These findings demonstrate the distinctive roles of strain compared with temperature on the relaxation dynamics and indicate that dynamical heterogeneity inherently relates to the fragility of glass-forming materials.
authors.affiliation: Physikalisches Institut, Universität Göttingen, D-37077 Göttingen, Germany.
authors.forename: Hai-Bin
authors.identifier: http://orcid.org/0000-0003-0645-0187
authors.initials: HB
authors.lastname: Yu
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: Ranko
authors.initials: R
authors.lastname: Richert
authors.affiliation: Institute for Materials Physics, University of Göttingen, D-37077 Göttingen, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Maaß
authors.affiliation: Physikalisches Institut, Universität Göttingen, D-37077 Göttingen, Germany.
authors.forename: Konrad
authors.initials: K
authors.lastname: Samwer