Localization model description of the interfacial dynamics of crystalline Cu and Cu64Zr36 metallic glass films

2020 ◽  
Vol 153 (12) ◽  
pp. 124508
Author(s):  
Gazi Mahmud ◽  
Hao Zhang ◽  
Jack F. Douglas
Keyword(s):  
Metallic Glass ◽  
Model Description ◽  
Interfacial Dynamics ◽  
Localization Model ◽  
Glass Films

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.

Extrinsic mechanical size effects in thin ZrNi metallic glass films

2015 ◽  
Vol 90 ◽  
pp. 232-241 ◽  
Author(s):  
M. Ghidelli ◽  
S. Gravier ◽  
J.-J. Blandin ◽  
P. Djemia ◽  
F. Mompiou ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Size Effects ◽  
Glass Films

scholarly journals Crystallization Behavior of Electrodeposited Pd-Ni-P Metallic Glass Films by Heat Treatment

2013 ◽  
Vol 64 (4) ◽  
pp. 244-247
Author(s):  
Chihiro MOCHIZUKI ◽  
Yuusei KIMURA ◽  
Hiroyuki ISSHIKI ◽  
Junji YAMANAKA ◽  
Masami SHIBATA
Keyword(s):  
Heat Treatment ◽  
Metallic Glass ◽  
Crystallization Behavior ◽  
Glass Films

Size-dependent failure mechanisms in ZrNi thin metallic glass films

2014 ◽  
Vol 89 ◽  
pp. 9-12 ◽  
Author(s):  
Matteo Ghidelli ◽  
Sébastien Gravier ◽  
Jean-Jacques Blandin ◽  
Jean-Pierre Raskin ◽  
Frédéric Lani ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Failure Mechanisms ◽  
Size Dependent ◽  
Dependent Failure ◽  
Glass Films

Low‐Iridium‐Content IrNiTa Metallic Glass Films as Intrinsically Active Catalysts for Hydrogen Evolution Reaction

2019 ◽  
Vol 32 (4) ◽  
pp. 1906384 ◽  
Author(s):  
Zi‐Jian Wang ◽  
Ming‐Xing Li ◽  
Ji‐Hao Yu ◽  
Xing‐Bo Ge ◽  
Yan‐Hui Liu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Glass Films

Model Description of the Unusual Temperature Dependence of the Viscosity of Metallic Glass-Forming Liquids

2021 ◽  
Vol 1016 ◽  
pp. 30-35
Author(s):  
Masaru Aniya ◽  
Masahiro Ikeda
Keyword(s):  
High Temperature ◽  
Metallic Glass ◽  
Temperature Dependence ◽  
Present Report ◽  
Model Description ◽  
Unusual Behavior ◽  
Glass Forming ◽  
Viscosity Models ◽  
Strong Transition ◽  
Type Of Behavior

The temperature dependence of the viscosity of some metallic glass forming liquids (MGFLs) exhibits an unusual behavior. At high temperature, the temperature dependence is quite weak, whereas at low temperature, the viscosity varies exponentially. Recently, this type of behavior are attracting much attention, because it can be considered as a manifestation of the fragile-to-strong transition. Well known classic viscosity models do not describe such kind of behavior over a wide temperature range. In the present report, it is shown that a modified version of the Bond Strength-Coordination Number Fluctuation (BSCNF) model describes the behavior observed in MGFLs. For the convenience of the readers, a brief review of the BSCNF model is also given.

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