Ultrasound-induced crystallization around the glass transition temperature for Pd40Ni40P20 metallic glass

Tetsu Ichitsubo, Eiichiro Matsubara, Satoshi Kai, Masahiko Hirao

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

We have found that crystallization of a Pd40Ni 40P20 bulk metallic glass is accelerated in the vicinity of the glass transition temperature Tg when it is subjected to sub/low-MHz frequency ultrasonic vibration. Resonance frequencies and internal frictions have been measured with the electromagnetic acoustic resonance (EMAR) technique. In the initial heating process of an as-cast glassy sample, the resonance frequencies jump up just above Tg under ultrasonic excitation, which is attributed to nano-crystallization that is confirmed by the X-ray diffraction profile. However, such a notable change is not observed without ultrasonic vibration. The irregular Λ-shaped internal-friction peaks are also observed prior to the abrupt crystallization. This rapid crystallization is considered to be caused by a stochastic resonance, in which the jump frequency of atoms matches the frequency of the interatomic-potential change by the ultrasonic vibration.

Original languageEnglish
Pages (from-to)423-429
Number of pages7
JournalActa Materialia
Volume52
Issue number2
DOIs
Publication statusPublished - 2004 Jan 19

Keywords

  • Acoustic method
  • Bulk amorphous materials
  • Casting
  • Phase transformations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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