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Tuning apparent friction coefficient by controlled patterning bulk metallic glasses surfaces.

Ning Li^1,2, Erjiang Xu¹, Ze Liu³

¹School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PRC.

Scientific Reports

|December 20, 2016

Summary

Texturing bulk metallic glass surfaces with micro-honeycomb structures reduces friction. Optimal pitch geometry minimizes the friction coefficient by balancing contact area and local stress for metallic glass applications.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Area of Science:

Materials Science
Tribology
Surface Engineering

Background:

Bulk metallic glasses (BMGs) exhibit unique properties but their surface interactions, particularly friction, require optimization for broader applications.
Surface topography significantly influences the tribological behavior of materials.

Purpose of the Study:

To investigate the effect of micro-honeycomb structure pitch on the frictional behavior of a Zr-Ti-Cu-Be bulk metallic glass.
To understand the underlying mechanisms governing friction reduction through surface texturing.

Main Methods:

Hot-embossing of micro-honeycomb structures with varying pitches onto a Zr35Ti30Cu8.25Be26.75 bulk metallic glass surface.
Systematic investigation of the frictional behavior of the textured surfaces compared to a smooth surface.

Main Results:

All micro-honeycomb textured surfaces demonstrated reduced friction coefficients compared to the smooth surface.
An optimal pitch range was identified where the friction coefficient initially decreased and then increased with increasing pitch.
This trend is attributed to the interplay between contact area and local stress concentration as pitch varies.

Conclusions:

Surface topography, specifically micro-honeycomb pitch, plays a critical role in modulating the frictional properties of bulk metallic glasses.
The findings provide fundamental insights into the tribological mechanisms of textured BMGs.
This research opens avenues for designing advanced BMG surfaces for functional applications requiring controlled friction.