2017/03/27 by Stefan Küchemann, Küchemann, Stefan, R. Maaß +1
Engineering · Materials Science · #Metallic Glasses and Amorphous Alloys #Material Dynamics and Properties #Glass properties and applications
paper · pdf · doi:10.48550/arxiv.1703.09016
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.