Abstract
The varying degrees of configurational disorder in metallic glasses are investigated quantitatively by molecular dynamics studies. A parameter, the quasi-nearest atom, is used to characterize the configurational disorder in metallic glasses. Our observations suggest configurational disorder play a role in structural heterogeneity, plasticity and dynamic relaxations in metallic glasses. The broad configurational disorder regions distribution is the indicator of abundant potential deformation units and relaxations. Plastic flow, as well as relaxation, is believed to start at configurational disorder regions. The width of the shear bands and dynamic relaxations can then be regulated by the degree of configurational disorder regions in metallic glasses.
Highlights
Under different conditions is still not clear, giving to the complexity in studying the STZ and β relaxation, and their relationship to the atomic structure
Metallic glasses (MGs) with a high temperature and cooling rate may have much looser atomic packings than those with a low temperature and cooling rate, which may lead to more prominently configurational disorder. This increasing trend is consistent with recent simulations in which a high temperature and rapid cooling rates weaken the degree of order in MGs33
Based on MD simulations, the effects of configurational disorder regions constituted by atoms number of QNAs (NQ) > 0 in metallic glasses were investigated
Summary
Under different conditions is still not clear, giving to the complexity in studying the STZ and β relaxation, and their relationship to the atomic structure. Pan et al.[32] have investigated structural disorder in eight metallic glass-forming systems at various temperatures by QNA Their results showed that the scaled distribution of the number of QNA appears to be a universal property. Relationships have been proposed to reflect the correlations between QNA, potential energy and dynamical properties. They found that the parameter of QNA is general, and can be used across different MG systems. The results show that the number of QNAs and the yield strength has a negative linear correlation, and the number of QNAs and elastic modulus has a negative linear correlation These are helpful in understanding the structural origin of the plastic and dynamic deformations
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