Acoustic probes for plasticity in amorphous materials*

Amorphous materials have a disordered structure inducing sound scattering and anomalous density of vibrations in the THz range. These properties affect their thermal properties, but also acoustic attenuation properties. These acoustic attenuation properties can be described in terms of an effective visco-elastic modelling for the constitutive laws charcterizing the material at the continuum scale. In the low frequency regime however, acoustic propagation is well described by plane waves and ballistic phonons. But the occurrence of plastic deformation results in a succession of local irreversible rearrangements at the nanometric scale known as Transformation Zones. These Transformation Zones are shown to be well described within the theory of Eshelby inclusions, and thus act as acoustic scatterers. We will discuss in this talk the signature of plasticity in acoustic scattering in amorphous materials.

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