Abstract
The elastic moduli of the metallic nanoglasses Fe86Sc14, Fe90Sc10, Cu58Zr42, and Cu60Zr40 were determined by measuring their longitudinal and shear wave velocities together with their densities. The data were compared to the elastic moduli of the conventional melt-spun metallic glass counterparts of the same chemical composition. The elastic moduli for the nanoglasses were significantly smaller than those of the metallic glass counterparts. Finally, a comparison was made between the data for nanoglasses and metallic glasses from the literature.
Highlights
Nanoglasses are non-crystalline materials with controlled modifications of their defect and/or chemical microstructure by methods that are comparable to those used for crystalline nanomaterials [1,2,3,4]
The Mossbauer spectrum of the glassy core regions of a Fe90Sc10 nanoglass is a single-line spectrum whereas the spectra of the amorphous interfacial regions consist of six lines, indicating that the glassy regions are paramagnetic whereas the interfaces are ferromagnetic at room temperature (295 K)
Considering the fairly large error margin of the glassy ribbon materials, it seems fair to conclude that the investigated nanoglasses evidence distinctly reduced moduli compared to their conventional metallic glass counterparts with the same chemical composition
Summary
Nanoglasses are non-crystalline materials with controlled modifications of their defect and/or chemical microstructure by methods that are comparable to those used for crystalline nanomaterials [1,2,3,4]. One way of introducing a high density of defects into crystals in the form of incoherent interfaces (grain boundaries) is by consolidating nanometer-sized crystals with identical or different chemical compositions In these interfaces, a large number of atoms are present which affect the properties of materials to a great extent. The elastic modulus of this nanoglass with a cluster size of about 10 nm was * 78.8 GPa [16] which was about 10% higher than the elastic modulus of the corresponding bulk metallic glass [17, 18] It is the goal of this study to measure with ultrasound the elastic moduli in the two non-crystalline materials of the same compositions such as FeSc and CuZr nanoglasses and their conventional melt-spun metallic glass counterparts and to elucidate whether there are systematic differences. These moduli are high frequency moduli which have been derived from the determination of ultrasound velocities of shear and longitudinal waves generated by appropriate transducers in the materials
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