publication . Article . Other literature type . 2014

Effect of physical aging on Johari-Goldstein relaxation in La-based bulk metallic glass

Jichao Qiao; Riccardo Casalini; Jean-Marc Pelletier;
Open Access English
  • Published: 14 Sep 2014
  • Publisher: HAL CCSD
  • Country: France
Abstract
cited By 15; International audience; The influence of physical aging on the β relaxation in La60Ni15Al25 bulk metallic glass has been investigated by mechanical spectroscopy. The amplitude of the β relaxation (ΔG″) decreases while its relaxation time (τβ) increases during aging. We find that, as in organic glasses, the changes of ln (τβ) and ln (ΔGmax) are linearly correlated with ln (τβ) = b - a ln (G max ″). This behavior is discussed in term of the asymmetric double-well potential (ADWP) model, with U and Δ the energies characterizing the ADWP. It is suggested that during aging the ratio U/Δ remains approximately constant, with a value close to the coefficien...
Subjects
free text keywords: Glass, Glass transition, Bulk metallic glass, Double-well potential, Johari-Goldstein relaxation, Linear correlation, Mechanical spectroscopy, Organic materials, Physical aging, Stretched exponential, Metallic glass, [SPI.MAT]Engineering Sciences [physics]/Materials, [ SPI.MAT ] Engineering Sciences [physics]/Materials, Relaxation (NMR), Metallurgy, Amorphous metal, Atomic physics, Spectroscopy, Exponential function, Thermodynamics, Chemistry, Amplitude
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publication . Article . Other literature type . 2014

Effect of physical aging on Johari-Goldstein relaxation in La-based bulk metallic glass

Jichao Qiao; Riccardo Casalini; Jean-Marc Pelletier;