Temperature and Loading Rate Effect on the Load-Displacement Response of Metal-Metallic Glass (Al-Cu₅₀Zr₅₀) Layered Structure during Nano-Indentation

Abstract:

Molecular dynamics (MD) simulations of metal-metallic glass (Al-Cu₅₀Zr₅₀) multilayer during nanoindentation is carried out to investigate the load-displacement response, mechanical properties and deformation mechanisms. The indentation study is carried out at temperatures in the range of cryogenic to room temperature (10 K-300 K). The indenter speeds are varied between 0.5-5 Å/ps to study the effect of loading rate. The interaction between Al-Cu-Zr atoms are defined by EAM (Embedded Atom Method) potential. A sample size of 200 Å × 200 Å × 200 Å (in x y z-direction) comprising of 538538 atoms is used for nanoindentation. P P S boundary condition (BC) in x y z direction and NVT ensemble are used. We observed a peak load of 117 nN, at a temperature of 10 K with a loading rate of 5 Å/ps. We found that as the loading rate increase, the peak load also increases. As anticipated, the increase in temperature decreases the strength of the multilayer. The atomic displacement vector plots reveal that MG act as hurdles to the movement of dislocations nucleated at the interface.

• Periodical: Materials Science Forum (Volume 978)
• Pages: 330-336
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.978.330
• Online since: February 2020
• Authors: Pradeep Gupta*, Natraj Yedla
• Keywords: Loading Rate, Metallic Glass, Molecular Dynamics, Nanoindentation

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