Solidification analyses for the fabrication of bulky multicomponent metallic glasses and their properties

Akihisa Inoue, Yoshiyuki Shinohara, Yoshihiko Yokoyama

Research output: Contribution to journalConference articlepeer-review

Abstract

The liquid-crystalline transformation during continuous cooling was examined for a Zr60Al10Ni10Cu15Pd5 alloy which was ejected into a wedge-shape cavity in a copper mold or solidified on a copper hearth by unidirectional arc melting. The structure consists of a glassy phase in the wedge angles smaller than 10 degrees and changes to glassy and crystalline phases in the higher angle range. The start (Cs) and termination (Ct) points for the transformation were determined and the continuous-cooling-transformation (C.C.T.) curves were constructed. The nose temperature (Tn) and the time (tn) up to the nose point in the C.C.T. curves were 1018 K and 0.93 s. The critical cooling rate for glass formation defined by (Tm-Tn)/tn is 110 K/s. Furthermore, with the aim of clarifying a solidification condition for formation of a bulk glassy alloy by unidirectional arc melting, the relation between the formation of a glassy phase and the solidification parameters of moving velocity of liquid/solid interface (V), temperature gradient (G) and cooling rate (R) was examined. The glassy phase was obtained in the condition of V>3 mm/s, G>4 K/mm and R>40 K/s. The supercooling reaches 385 K at 10 K/s. The large supercooling ability is presumably due to the formation of a highly dense randomly packed structure where the nucleation of a crystalline phase and the atomic rearrangement for growth reaction are difficult.

Original languageEnglish
Pages (from-to)235-244
Number of pages10
JournalMaterials Research Society Symposium - Proceedings
Volume400
Publication statusPublished - 1996 Jan 1
EventProceedings of the 1995 Fall MRS Symposium - Boston, MA, USA
Duration: 1995 Nov 271995 Nov 30

ASJC Scopus subject areas

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

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