Structural relaxation of Mg–Cu–Y metallic glasses occurs at room-temperature (0.7 Tg) and induces an abrupt embrittlement after periods of time that depend on the relative proportions of Cu and Mg. Internal friction measurements of as-quenched samples show that Mg65Cu25Y10 is in a more relaxed state than Mg85Cu5Y10, suggesting a more compact structure for the alloy with a larger amount of Cu, which is the smallest atom in the system. Relaxation spectra, calculated from the anelastic component of nanoindentation creep curves, show that the two alloys are in a similar relaxed state, when they become brittle. The results are discussed in terms of the defects characterizing the disordered structure of the metallic glass.
Room-temperature creep and structural relaxation of Mg-Cu-Y metallic glasses
CASTELLERO, Alberto;
2008-01-01
Abstract
Structural relaxation of Mg–Cu–Y metallic glasses occurs at room-temperature (0.7 Tg) and induces an abrupt embrittlement after periods of time that depend on the relative proportions of Cu and Mg. Internal friction measurements of as-quenched samples show that Mg65Cu25Y10 is in a more relaxed state than Mg85Cu5Y10, suggesting a more compact structure for the alloy with a larger amount of Cu, which is the smallest atom in the system. Relaxation spectra, calculated from the anelastic component of nanoindentation creep curves, show that the two alloys are in a similar relaxed state, when they become brittle. The results are discussed in terms of the defects characterizing the disordered structure of the metallic glass.File | Dimensione | Formato | |
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