Abstract
The work presents a combined study on the impact of cryogenic thermal cycling in terms of differential scanning calorimetry measurements on bulk metallic glasses and extensive molecular dynamics simulations of a generic model glass former.
Highlights
Aging of glasses at temperatures well below the glass transition is marked by the evolution towards an unreachable equilibrium state
The present study is motivated by recent reports on improved plasticity of bulk metallic glasses upon deeply cooled thermal cycling [10,17]
It has been argued that, since metallic glasses have a nonuniform structure, the local heterogeneity of the thermal expansion coefficient induces nonaffine strains during cycling from room temperature down to cryogenic temperatures that could accumulate and increase structural disorder [14]
Summary
Aging of glasses at temperatures well below the glass transition is marked by the evolution towards an unreachable equilibrium state. It has been proposed that thermal cycling (TC)— referred to as (deep) cryogenic cycling—can induce rejuvenation effects, thereby improving the ductility of bulk metallic glasses (BMGs) [10,11,12,13]. The potential of heterogeneous internal strain to account for rejuvenation effects has been scrutinized in recent computer simulation studies of the thermal expansion coefficient and its spatial fluctuations in a Cu50Zr50 model glass [15]. Another molecular dynamics (MD) study of a binary LennardJones (LJ) mixture [16] implies that annealing treatments. The DSC measurements were performed on both as-cast and as-cast plus thermally cycled samples in the temperature range of 323 K to 798 K using the same heating and cooling rate of 20 K/min
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