Compression-compression fatigue study on model metallic glass nanowires by molecular dynamics simulations

2011 ◽  
Vol 110 (2) ◽  
pp. 023523 ◽  
Author(s):  
Yunfeng Shi ◽  
Despina Louca ◽  
Gongyao Wang ◽  
Peter K. Liaw
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
Molecular Dynamics Simulations ◽  
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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