Abstract
A mechanical spectroscopy study of Cu-Zr-Al bulk metallic glasses, was performed with two types of equipment: a Kê-type inverted torsion pendulum and an acoustic elastometer, working in the frequency ranges of Hz and kHz, respectively, with a heating rate of 1 K/min. The analysis of the anelastic relaxation shows similar spectra for both types of equipment resulting in internal friction patterns that vary with temperature and are not reproducible at each thermal cycle. The normalized of the square of the frequency changes from the first to later measurement cycles. These results indicate that the specimens of Cu-Zr-Al alloys were changing by mechanical relaxation, owing to the motion of atoms or clusters in the glassy state and possible "defects" produced during the processing of alloys.
Highlights
In recent years, the study of multicomponent glass‐forming alloys has been of great scientific and technological interest for their unique properties, due to the lack of long‐range regularity in their atomic structure and compositional homogeneity similar to the liquid state
Bulk metallic glasses produced by very rapid solidification, usually exhibit a non-equilibrium structure, so that heating the material to below its crystallization temperature leads to an atomic rearrangement to a more stable state
This phenomenon is known as structural relaxation, which is manifested by a continuous change in some physical properties[5]
Summary
The study of multicomponent glass‐forming alloys has been of great scientific and technological interest for their unique properties, due to the lack of long‐range regularity in their atomic structure and compositional homogeneity similar to the liquid state. Bulk metallic glasses produced by very rapid solidification, usually exhibit a non-equilibrium structure, so that heating the material to below its crystallization temperature leads to an atomic rearrangement to a more stable state. This phenomenon is known as structural relaxation, which is manifested by a continuous change in some physical properties[5]. This structural relaxation g can be understood as a decrease of the concentration of interstitialcy-like defects frozen-in upon glass production in which the concentration depends on the quenching temperature[10,11]
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