Main (α) relaxation and excess wing in Zr50Cu40Al10 bulk metallic glass investigated by mechanical spectroscopy

J. C. Qiao, R. Casalini, J. M. Pelletier

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23 Scopus citations

Abstract

The dynamic mechanical relaxation behaviour of Zr50Cu40Al10 bulk metallic glass was investigated by mechanical spectroscopy as a function of temperature. The mechanical spectra show the evidence of an "excess wing" process at the lower temperatures. The α-relaxation spectra of Zr50Cu40Al10 bulk metallic glass was described with a Kohlrausch-Williams-Watts (KWW) function, with the exponent βKWW = 0.5 ± 0.02. The fragility parameter m of the Zr50Cu40Al10 is m = 57 ± 5. The values of m and βKWW are found to agree with the correlation found for other glasses m = 250(± 30) - 320 βKWW [R. Böhmer, K.L. Ngai, C.A. Angell et al. J. Chem. Phys. 99 (1993) 4201-4209]. Aging experiments give strong evidence that the observed "excess wing" is a submerged secondary process and not part of the α process.

Original languageEnglish
Pages (from-to)106-109
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume407
DOIs
StatePublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Excess wing
  • Fragility
  • Main relaxation
  • Mechanical spectroscopy
  • Metallic glass

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