Critical growth and energy barriers of atomic-scale plastic flow units in metallic glasses

2021 ◽  
Vol 202 ◽  
pp. 114033
Author(s):  
J.H. Yu ◽  
L.Q. Shen ◽  
D. Şopu ◽  
B.A. Sun ◽  
W.H. Wang
Keyword(s):  
Plastic Flow ◽  
Metallic Glasses ◽  
Critical Growth ◽  
Atomic Scale ◽  
Energy Barriers ◽  
Flow Units

Critical Growth and Energy Barriers of Atomic-Scale Plastic Flow Units in Metallic Glasses

2021 ◽  
Author(s):  
Jihao Yu ◽  
Laiquan Shen ◽  
Daniel Sopu ◽  
B. A. Sun ◽  
W.H. Wang
Keyword(s):  
Plastic Flow ◽  
Metallic Glasses ◽  
Critical Growth ◽  
Atomic Scale ◽  
Energy Barriers ◽  
Flow Units

Brittle and Ductile Character of Amorphous Solids

2016 ◽  
Vol 8 (3) ◽  
pp. 485-498
Author(s):  
Miguel Lagos ◽  
Raj Das
Keyword(s):  
Glass Transition ◽  
Plastic Flow ◽  
Metallic Glasses ◽  
Bulk Material ◽  
Amorphous Solids ◽  
Amorphous Structure ◽  
Atomic Scale ◽  
Brittle Solid ◽  
Disordered Structure ◽  
The Difference

Abstract.Common silicate glasses are among the most brittle of the materials. However, on warming beyond the glass transition temperature Tg glass transforms into one of the most plastic known materials. Bulk metallic glasses exhibit similar phenomenology, indicating that it rests on the disordered structure instead on the nature of the chemical bonds. The micromechanics of a solid with bulk amorphous structure is examined in order to determine the most basic conditions the system must satisfy to be able of plastic flow. The equations for the macroscopic flow, consistent with the constrictions imposed at the atomic scale, prove that a randomly structured bulk material must be either a brittle solid or a liquid, but not a ductile solid. The theory permits to identify a single parameter determining the difference between the brittle solid and the liquid. However, the system is able of perfect ductility if the plastic flow proceeds in two dimensional plane layers that concentrate the strain. Insight is gained on the nature of the glass transition, and the phase occurring between glass transition and melting.

A quasi-phase perspective on flow units of glass transition and plastic flow in metallic glasses

2013 ◽  
Vol 376 ◽  
pp. 76-80 ◽  
Author(s):  
S.T. Liu ◽  
W. Jiao ◽  
B.A. Sun ◽  
W.H. Wang
Keyword(s):  
Glass Transition ◽  
Plastic Flow ◽  
Metallic Glasses ◽  
Flow Units

scholarly journals Guiding shear bands in bulk metallic glasses using stress fields: A perspective from the activation of flow units

2020 ◽  
Vol 102 (13) ◽  
Author(s):  
K. Kosiba ◽  
S. Scudino ◽  
J. Bednarcik ◽  
J. Bian ◽  
G. Liu ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Stress Fields ◽  
Flow Units

scholarly journals Atomic-scale viscoplasticity mechanisms revealed in high ductility metallic glass films

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hosni Idrissi ◽  
Matteo Ghidelli ◽  
Armand Béché ◽  
Stuart Turner ◽  
Sébastien Gravier ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Shear Banding ◽  
Atomic Scale ◽  
Microscopy Imaging ◽  
Rate Dependent ◽  
Imaging And Spectroscopy ◽  
Shear Transformation Zones ◽  
The Impact ◽  
Glass Films

Abstract The fundamental plasticity mechanisms in thin freestanding Zr65Ni35 metallic glass films are investigated in order to unravel the origin of an outstanding strength/ductility balance. The deformation process is homogenous until fracture with no evidence of catastrophic shear banding. The creep/relaxation behaviour of the films was characterized by on-chip tensile testing, revealing an activation volume in the range 100–200 Å3. Advanced high-resolution transmission electron microscopy imaging and spectroscopy exhibit a very fine glassy nanostructure with well-defined dense Ni-rich clusters embedded in Zr-rich clusters of lower atomic density and a ~2–3 nm characteristic length scale. Nanobeam electron diffraction analysis reveals that the accumulation of plastic deformation at room-temperature correlates with monotonously increasing disruption of the local atomic order. These results provide experimental evidences of the dynamics of shear transformation zones activation in metallic glasses. The impact of the nanoscale structural heterogeneities on the mechanical properties including the rate dependent behaviour is discussed, shedding new light on the governing plasticity mechanisms in metallic glasses with initially heterogeneous atomic arrangement.

An atomic-scale insight into the effects of hydrogen microalloying on the glass-forming ability and ductility of Zr-based bulk metallic glasses

2016 ◽  
Vol 125 ◽  
pp. 197-205 ◽  
Author(s):  
Reza Mahjoub ◽  
Kevin J. Laws ◽  
Nicholas E. Hamilton ◽  
Davide Granata ◽  
Michael Ferry
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Glass Forming Ability ◽  
Atomic Scale ◽  
Glass Forming ◽  
Insight Into

Atomic Scale Fluctuations Govern Brittle Fracture and Cavitation Behavior in Metallic Glasses

2011 ◽  
Vol 107 (21) ◽  
Author(s):  
P. Murali ◽  
T. F. Guo ◽  
Y. W. Zhang ◽  
R. Narasimhan ◽  
Y. Li ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Metallic Glasses ◽  
Atomic Scale ◽  
Cavitation Behavior
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