Indentation Deformation of a Cu47.5Zr19Hf28.5Al5 Bulk-Metallic Glass-Matrix Nanocomposite
In this work, we study the indentation deformation of a Cu47.5Zr19Hf28.5Al5 bulk-metallic glass-matrix composite and characterize the effects of the indentation-loading rate and the holding time at the peak-indentation load. For the same peak-indentation
load, increasing the holding time and/or decreasing the indentation-loading rate cause the increase of the indentation depth. There exists the “bulge” of the unloading curve at the onset of the unloading for small indentation-loading rates. The Vickers hardness is a monotonically
increasing function of the indentation-loading rate for the same peak-indentation load. For the indentations with the same loading and unloading time of 30 s and without an intermediate stage at the peak-indentation load, the Vickers hardness of the Cu47.5Zr19Hf28.5Al5
bulk-metallic glass-matrix composite decreases with the increase of the indentation load. The strain energy dissipated through plastic deformation during the indentation is a power-law function of the indentation load with a power index of 3/2, and the energy ratio (total energy/plastic energy)
linearly increases with the depth ratio (residual indentation depth/maximum indentation depth).
Keywords: Indentation; Metallic Glass; Plastic Flow
Document Type: Research Article
Affiliations: 1: School of Mechanical Engineering, Shanghai Dianji University, 201306, Shanghai, China 2: Materials Program, Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
Publication date: 01 March 2020
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