Homogenization of plastic deformation in metallic glass foils less than one micrometer thick

Journal Article · Mon Nov 01 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.82.172202· OSTI ID:21502868

Yavari, A R ^[1]; Georgarakis, K ^[2]; Botta, W J ^[3]; Inoue, A ^[2]; Vaughan, G ^[4]

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1. Institut Polytechnique de Grenoble (INPG), Euronano SIMaP-CNRS, 38402, St-Martin-d'Heres Campus (France)
2. WPI AIMR, Tohoku University, Sendai 980-8577 (Japan)
3. Department of Materials Engineering (DeMa), Federal University of Sao Carlos (UFSCar), CEP 13565-905, Sao Carlos, Sao Paulo (Brazil)
4. European Synchrotron Radiation Facility (ESRF), Grenoble (France)

Metallic glasses do not possess crystalline structures with slip systems that provide for plastic deformation via dislocation glide. As such, when put under applied stress, they show a wide reversible elastic deformation {epsilon}{sub el{approx_equal}}2% before plastic flow occurs heterogeneously by localization in shear bands only tens of nanometers in thickness. Very recently, there have been reports that in microscopic (submicron thickness) pillars, such shear bands no longer form and deformation occurs homogeneously. Here we report on plastic deformation of submicron thickness foils of metallic glasses. When such foils are compressed or notched, a similar transition occurs from the usual heterogeneous plastic deformation mode via shear banding to more homogeneous deformation without formation of shear bands. Some shape instabilities in the form of vortices observed at interfaces between plastic zones and nondeformed regions are consistent with sharp deformation-induced density, velocity, and viscosity gradients. The onset of homogeneous deformation in the microscopic regime is discussed in relation to shear-band formation energy and thickness.

• OSTI ID: 21502868
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 82, Issue 17; Other Information: DOI: 10.1103/PhysRevB.82.172202; (c) 2010 The American Physical Society; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEFORMATION
DENSITY
DISLOCATIONS
FOILS
FORMATION HEAT
INSTABILITY
INTERFACES
METALLIC GLASSES
PLASTICITY
SLIP
STRESSES
THICKNESS
THIN FILMS
VISCOSITY
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIMENSIONS
ENTHALPY
FILMS
LINE DEFECTS
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
REACTION HEAT
THERMODYNAMIC PROPERTIES