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Tribology Letters

, 66:27 | Cite as

Deformation of Ti-Based Bulk Metallic Glass Under a Cutting Tip

  • A. K. Basak
  • Liangchi Zhang
Original Paper
  • 160 Downloads

Abstract

This study aims to investigate the fundamental deformation mechanism of Ti-based bulk metallic glass under mechanical loading by a cutting tip. The cutting tip interaction is resolved into two separate actions, namely nanoindentation by using a Berkovich diamond indenter and contact sliding under a pin-on-disk configuration. The deformation details in the specimens due to the action of the corresponding mechanical loading were analyzed by SEM and TEM. It was found that under nanoindentation, the plastic deformation is evidenced by a series of pop-ins in load–displacement graphs. The temperature rise at the contact interface during sliding must have been above the glass transition temperature and the onset temperature of crystallization, leading to the formation of discrete nanocrystalline particles in the immediate subsurface and hence bringing about an increase in hardness of the metallic glass in the wear tracks.

Keywords

Plastic deformation Bulk metallic glass Indentation Microstructural change 

List of symbols

ψ

Half angle of Berkovich indenter (°)

Fmax

Peak load during nanoindentation (mN)

Tg

Glass transition temperature (K)

Tx

Onset temperature of crystallization (K)

Tb

Average bulk surface temperature (K)

Tf

Average flash temperature (K)

T0

Room temperature (K)

lb

Equivalent thermal length (m)

v

Sliding velocity (m/s)

a

Coefficient of thermal diffusivity (m2/s)

r0

Radius of the pin (m)

μ

Coefficient of friction

An

Nominal (apparent) contact area (m2)

Km

Thermal conductivity of the pin (j/k m s)

H0

Room temperature hardness (Pa)

ra

Radius of an asperity (m)

N

Number of contacting asperities

\(\bar{F}\)

Normalized force

F

Normal force on sliding interface (N)

\(\bar{V}\)

Normalized sliding velocity

Notes

Acknowledgements

The authors would like to thank the Australian Research Council for its financial support to this research.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing EngineeringThe University of New South WalesSydneyAustralia
  2. 2.Adelaide MicroscopyThe University of AdelaideAdelaideAustralia

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