Abstract
Among different methods for determining elastic constants of a material, a special place belongs to the resonant ultrasound spectroscopy (RUS), as to a fast and non-destructive technique. We use a home-made RUS spectrometer to investigate the elastic properties of Ni71.5Cr5.6Nb3.4P16.5B3, a bulk metallic glass alloy (Ni-BMG). The sample was made by a counter-gravity suction casting technique and has shape of a cylinder. Modeling the measured spectrum of acoustic resonances for the sample in its cylindrical geometry was done with finite element analysis (FEA). FEA gives a longitudinal modulus (C11) of 300 GPa, and a Young's modulus (C44) of 50 GPa +/−5%. The determined values we verify by ultrasound pulse-echo technique, and compare them with the literature data for other Ni-bearing bulk metallic glass alloys. [This work was partially supported by NSF DMR award number 1709282. National High Magnetic Field Laboratory is supported by NSF/DMR-1644779 and the State of Florida.]
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