Thermodynamic approach to glass-forming ability of water-quenched Pd-P-based and Pt60Ni15P25 bulk metallic glasses

O. Haruyama, T. Watanabe, K. Yuki, M. Horiuchi, Hidemi Kato, Nobuyuki Nishiyama

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Despite its importance, a thermodynamic approach to determining the glass-forming ability (GFA) of bulk metallic glass (BMG) remains a goal to be achieved. We examined the GFA of water-quenched Pd-P-based and Pt 60Ni15P25 BMG's in which their molten alloys were sufficiently treated with a dehydrated B2O3 flux prior to and during quenching to room temperature. This allowed us to envisage the applicability of the classical steady-state homogeneous nucleation theory because the suppression of heterogeneous nucleation worked effectively. GFA was examined by comparing the critical cooling rate Rch for glass formation with the maximum diameter dmax of glass. To calculate Rch, the homogeneous nucleation rate Iss(T), and the growth rate uc(T) were estimated as functions of the undercooling temperature of molten alloys. Then, the free energy difference ΔGL-x(T) between the liquid and crystalline phases, and the viscosity η(T) of the liquid were experimentally determined while the surface energy σsL(T) at the liquid-nucleus interface was estimated by calculation. The dmax of rod BMG's correlated strongly to Rch through the relation Rch dmax-3/10 mm3 Ks-1.

Original languageEnglish
Article number064201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number6
DOIs
Publication statusPublished - 2011 Feb 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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