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Room-temperature creep and structural relaxation of Mg–Cu–Y metallic glasses

✍ Scribed by A. Castellero; B. Moser; D.I. Uhlenhaut; F.H. Dalla Torre; J.F. Löffler

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
896 KB
Volume
56
Category
Article
ISSN
1359-6454

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✦ Synopsis

Structural relaxation of Mg-Cu-Y metallic glasses occurs at room-temperature ($0.7 T g ) 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 Mg 65 Cu 25 Y 10 is in a more relaxed state than Mg 85 Cu 5 Y 10 , 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.

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