Thermodynamic and kinetic analyses of formation of amorphous and nanocrystalline alloys with the aid of computer and database

A. Takeuchi, A. Inoue

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Thermodynamic and kinetic simulations were performed to clarify the formations of amorphous and nanocrystalline alloys On the basis of the Miedema's model partially assisted by a database, the amorphous-forming composition region (AFCR) and crystallization temperature (Tx) of the multicomponent amorphous alloys were calculated from thermodynamic approaches. On the other hand, kinetic simulations were performed for Ni-Nb binary eutectic system by the phase field model. The AFCRs calculated for ternary alloy systems containing practically important elements such as Al, Cu, Fe, Ni, Ti agree with the experimental trends. The values of Tx for iron-group-based alloys are calculated with approximate errors of several tens of Kelvin to the experimental data. For Ni62.4Nb37.6 alloy, the critical cooling rate (Rc) for formation of amorphous phase and incubation time (τ) for crystallization are calculated to be Rc= 3 × 102 K/s and τ=1000 s. These values are closed to the value calculated from the time-transformation diagram for crystallization based on the homogeneous nucleation theory (Rc=1.4 × 103 K/s ×=105 s). The present study indicates the importance of the simultaneous analyses of transformations from thermodynamic and kinetic aspects for the development of amorphous alloys in near future.

Original languageEnglish
Pages (from-to)533-540
Number of pages8
JournalJournal of Optoelectronics and Advanced Materials
Volume6
Issue number2
Publication statusPublished - 2004 Jun 1

Keywords

  • Amorphous alloy
  • Database
  • Kinetics
  • Nanocrystalline alloy
  • Thermodynamics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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