Article ID Journal Published Year Pages File Type
1448844 Acta Materialia 2008 9 Pages PDF
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.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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