Mechanical behavior of Cu-Zr bulk metallic glasses (BMGs)：A molecular dynamics approach

doi:10.1088/1674-1056/22/9/096101

Abstract In the present work, three-dimensional molecular dynamics simulation is carried out to elucidate the nanoindentation behaviors of CuZr Bulk metallic glasses (BMGs). The substrate indenter system is modeled using hybrid interatomic potentials including both many-body Finnis Sinclair (FS) and two-body Morse potentials. A spherical rigid indenter (diameter=60 Å(1 Å=10¹⁰ m)) is employed to simulate the indentation process. Three samples of BMGs including Cu₂₅Zr₇₅, Cu₅₀Zr₅₀, and Cu₇₅Zr₂₅ are designed and the metallic glasses are formed by rapid cooling from the melt state at about 2000 K. The radial distribution functions are analyzed to reveal the dynamical evolution of the structure of the atoms with different compositions and different cooling rates. The mechanical behavior can be well understood in terms of load-depth curves and Hardness-depth curves during the nanoindentation process. Our results indicate a positive linear relationship between the hardness and the Cu concentration of the BMG sample. To reveal the importance of cooling rate provided during the processing of BMGs, we investigate the indentation behaviors of Cu₅₀Zr₅₀ at three different quenching rates. Nanoindentation results and radial distribution function (RDF) curves at room temperature indicate that a sample can be made harder and more stable by slowing down the quenching rate.

Keywords: Bulk metallic glasses (BMGs) nanoindentation deformation quenching rate

Received: 26 December 2012
Revised: 27 March 2013
Accepted manuscript online:

PACS:	62.20.F-	(Deformation and plasticity)
	62.20.mm	(Fracture)
	62.20.mt	(Cracks)

Fund: Project supported by the Higher Education Commission (HEC) of Pakistan (Grant No.+923445490402).

Corresponding Authors: Muhammad Imran
E-mail: anam_iub@yahoo.com

Cite this article:

Muhammad Imran, Fayyaz Hussain, Muhammad Rashid, Yongqing Cai, S. A. Ahmad Mechanical behavior of Cu-Zr bulk metallic glasses (BMGs)：A molecular dynamics approach 2013 Chin. Phys. B 22 096101

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Mechanical behavior of Cu-Zr bulk metallic glasses (BMGs)：A molecular dynamics approach

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