Rejuvenation behavior and new classification of β-relaxation region in Pd-based metallic glass

Rui Yamada, Naoyuki Tanaka, Wei Guo, Junji Saida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We have focused on a rejuvenation behavior of recovery annealed Pd42.5Cu30Ni7.5P20 metallic glass. Specific heat measurement results revealed that only 33%, which is lower than that (44%) of a Zr50Cu40Al10 metallic glass, was recovered by annealing. This result indicates that the recovery of a Pd42.5Cu30Ni7.5P20 metallic glass is more difficult than the Zr-based alloy. The hardness measurement results obtained from the indentation test also supported this finding. The time dependence of the normalized storage modulus E'/Eu at 0.8Tg of both metallic glasses were successfully demonstrated by the KWW (Kohlrausch-Williams-Watts) equation, which means that the relaxation/rejuvenation behavior of each sample was well described by the free volume change. It also suggested that the distribution of relaxation modes of the Pd42.5Cu30Ni7.5P20 metallic glass is much narrower in a β-relaxation region. The normalized loss modulus E"/Eu implied that two areas, one is in correlation to the free volume change and the other is not, are embedded in the intrinsic β-relaxation region and the lower rejuvenation ability in the Pd42.5Cu30Ni7.5P20 metallic glass may originate from a low volume fraction of the former area. The present study will provide the universal information for the research subject on the thermal rejuvenation in metallic glasses.

Original languageEnglish
Pages (from-to)191-198
Number of pages8
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume68
Issue number3
DOIs
Publication statusPublished - 2019

Keywords

  • Palladium-based metallic glass
  • Recovery annealing
  • Rejuvenation
  • Zirconium-based metallic glass
  • β-relaxation region

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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