Strain induced fragility transition in metallic glass

Hai-Bin Yu (), Ranko Richert, Robert Maaß and Konrad Samwer ()
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Hai-Bin Yu: Physikalisches Institut, Universität Göttingen
Ranko Richert: Arizona State University
Robert Maaß: Institute for Materials Physics, University of Göttingen
Konrad Samwer: Physikalisches Institut, Universität Göttingen

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8179

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