Characterization of Nanoscale Mechanical Heterogeneity in a Metallic Glass by Dynamic Force Microscopy
2011; American Physical Society; Volume: 106; Issue: 12 Linguagem: Inglês
10.1103/physrevlett.106.125504
ISSN1092-0145
AutoresY. H. Liu, D. Wang, K. Nakajima, W. Zhang, Akihiko Hirata, Toshio Nishi, Akihisa Inoue, Mingwei Chen,
Tópico(s)Adhesion, Friction, and Surface Interactions
ResumoWe report nanoscale mechanical heterogeneity of a metallic glass characterized by dynamic force microscopy. Apparent energy dissipation with a variation of ~12%, originating from nonuniform distribution of local viscoelasticity, was observed. The correlation length of the heterogeneity was measured to be ~2.5 nm, consistent with the dimension of shear transformation zones for plastic flow. This study provides the first experimental evidence on the nanoscale viscoelastic heterogeneity in metallic glasses and may fill the gap between atomic models and macroscopic glass properties.
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