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arXiv · 1703.09016

Gamma relaxation in bulk metallic glasses

Stefan Küchemann·Robert Maaß
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Abstract

Studying the primary α- and secondary β-relaxation process has contributed significantly to the understanding of the structure and rheology of metallic glasses. In this letter, we report on a third relaxation mechanism indicated by a maximum in the loss modulus at low temperatures, which we term γ-relaxation. Contrary to the α- and β-relaxation mechanisms, this irreversible, low energy excitation causes a macroscopic rejuvenation, which we assign to non-affine atomic rearrangements in the matrix that are driven by thermal stresses during cooling. Observed in three different glassy alloys, the low temperature relaxation is identified as a general process in metallic glasses.

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Stefan Küchemann, Robert Maaß. 2017-03-27. Gamma relaxation in bulk metallic glasses. https://arxiv.org/abs/1703.09016

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