Elucidating how correlated operation of shear transformation zones leads to shear localization and fracture in metallic glasses: Tensile tests on Cu Zr based metallic-glass microwires, molecular dynamics simulations, and modelling

2019 ◽  
Vol 119 ◽  
pp. 1-20 ◽  
Author(s):  
K.F. Gan ◽  
S.S. Jiang ◽  
Y.J. Huang ◽  
H.B.C. Yin ◽  
J.F. Sun ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
Molecular Dynamics Simulations ◽  
Metallic Glasses ◽  
Tensile Tests ◽  
Shear Localization ◽  
Shear Transformation ◽  
Shear Transformation Zones ◽  
Dynamics Simulations

scholarly journals Transition to chip serration in simulated cutting of metallic glasses

2021 ◽  
Vol 94 (7) ◽  
Author(s):  
Karina E. Avila ◽  
Vardan Hoviki Vardanyan ◽  
Herbert M. Urbassek
Keyword(s):  
Molecular Dynamics ◽  
Surface Morphology ◽  
Molecular Dynamics Simulations ◽  
Metallic Glasses ◽  
Shear Bands ◽  
Shear Localization ◽  
Atomistic Simulations ◽  
Depth Of Cut ◽  
Nanocrystalline Metals ◽  
Dynamics Simulations

Abstract Cutting of metallic glasses produces as a rule serrated and segmented chips in experiments, while atomistic simulations produce straight unserrated chips. We demonstrate here that with increasing depth of cut – with all other parameters unchanged – chip serration starts to affect the morphology of the chip also in molecular dynamics simulations. The underlying reason is the shear localization in shear bands. As the distance between shear bands increases with increasing depth of cut, the surface morphology of the chip becomes increasingly segmented. The parallel shear bands that formed during cutting do no longer interact with each other when their separation is $$\gtrsim $$ ≳ 10 nm. Our results are analogous to the so-called fold instability that has been found when machining nanocrystalline metals. Graphic abstract

Synthesis of Sm–Al metallic glasses designed by molecular dynamics simulations

2018 ◽  
Vol 53 (16) ◽  
pp. 11488-11499 ◽  
Author(s):  
G. B. Bokas ◽  
Y. Shen ◽  
L. Zhao ◽  
H. W. Sheng ◽  
J. H. Perepezko ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Metallic Glasses ◽  
Dynamics Simulations

Experimental Studies and Molecular Dynamics Simulations of the Sliding Contact of Metallic Glass

2000 ◽  
Vol 644 ◽  
Author(s):  
Xi-Yong Fu ◽  
Michael L. Falk ◽  
David A. Rigney
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
Molecular Dynamics Simulations ◽  
Bulk Metallic Glass ◽  
Amorphous Material ◽  
Experimental Studies ◽  
Sliding Contact ◽  
Atomic Scale ◽  
Sliding Interface ◽  
Dynamics Simulations

AbstractTribological properties of bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 were studied experimentally using a pin/disk geometry without lubrication. Experimental observations were compared with 2D molecular dynamics simulations of amorphous material in sliding contact. The friction coefficient and the wear rate of bulk metallic glass (BMG) depend on normal load and test environment. The sliding of annealed BMG re-amorphizes devitrified material. A mechanically mixed layer is generated during sliding; this layer has enhanced oxygen content if the sliding is in air. The MD simulations show that atomic scale mixing occurs across the sliding interface. The growth kinetics of the mixing process scales with the square root of time. In the simulations, a low density region is generated near the sliding interface; it corresponds spatially to the softer layer detected in experiments. Subsurface displacement profiles produced by sliding and by simulation are very similar and are consistent with the flow patterns expected from a simple Navier-Stokes analysis when the stress state involves both compression and shear.

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