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Molecular dynamics simulation of nanotribology properties of CuZr metallic glasses

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Abstract

The effects of scratch depth, scratch speed, and alloy composition on the mechanical deformation and nanotribology properties of CuZr metallic glasses are studied using molecular dynamics simulations based on the second-moment approximation of the many-body tight-binding potential. These effects are investigated in terms of atomic trajectories, slip vectors, friction force, normal force, and friction coefficient. The simulation results show that a few shear transformation zones independently develop at the contact area between the probe tip and the film. Pileup occurs in the nanoscratch process but not during nanoindentation at a depth of 2.4 nm. There are two areas on the surface where the atoms have high slip vector values during nanoscratching. These areas form due to the removal of atoms that piled up around the probe tip and those behind the probe tip, respectively. Both the friction force and the normal force increase with increasing scratch depth and scratch speed. Friction coefficients decrease with increasing scratch depth, scratch speed, and Zr content in films.

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Acknowledgments

This work was supported by the National Science Council of Taiwan under Grants MOST 104-2221-E-033-062-MY2 and MOST NSC 104-2622-E-033-006-CC3.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chung Yuan Christian University, 200, Chung Pei Rd., Chung Li District, Taoyuan City, 32023, Taiwan

    Cheng-Da Wu

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  1. Cheng-Da Wu
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Correspondence to Cheng-Da Wu.

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Wu, CD. Molecular dynamics simulation of nanotribology properties of CuZr metallic glasses. Appl. Phys. A 122, 486 (2016). https://doi.org/10.1007/s00339-016-9998-6

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  • DOI: https://doi.org/10.1007/s00339-016-9998-6

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