Dynamic relaxation of Pd42.5Ni7.5Cu 30P20 metallic glass

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Abstract

Dynamic relaxation of Pd42.5Ni7.5Cu 30P20 metallic glass (Tg ∼ 575 K) was measured in T = 153 ∼ 563 K (27∼98% of 7g) with the angular frequency (co) = 10-3 ∼ 102 rad/s under the isothermal condition. By the time-temperature superimpose rule, master curves for storage (E') and loss (E") moduli in the angular-frequency range with 16 orders of magnitude were successfully obtained. In addition to the α-relaxation and slow β-relaxation, which have been discusses in literatures, the present master curves exhibits another relaxation mode in the lower temperature region (< RT) with activation energy Q = 0.25 eV which is the fastest among three. These dynamic relaxations were characterized with the typical stretched exponent relaxation function, then, the processes for these relaxations were discussed thermodynamically from the activation energy and the attempt frequency.

Original languageEnglish
Pages (from-to)228-235
Number of pages8
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume60
Issue number5
DOIs
Publication statusPublished - 2013 May 1

Keywords

  • Beta relaxation
  • Dynamic relaxation
  • Glass transition
  • Metallic glass

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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