Open AccessCorrelations between viscosity and glass-forming ability in bulk amorphous alloys
Author(s) -
Wei Hong-qing,
Xiang-An Li,
Zhilin Long,
Peng Jian,
Ping Zhang,
Zhichun Zhang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.2556
Subject(s) - fragility , crystallization , thermodynamics , amorphous metal , materials science , glass transition , viscosity , amorphous solid , physics , chemistry , metallurgy , crystallography , alloy , composite material , polymer
According to the classical crystallization theory, the influences of kinetics and thermodynamics on glassforming ability GFA for bulk metallic glasses has been investigated. The theoretical analysis shows that crystallization resistance is in proportion to the viscosity of “nose” temperature Tn while crystallization driving force is inversely proportional to the viscosity of crystallization onset temperature Tx on reheating in timetemperaturetransformation TTT curve, and therefore a GFA parameter ω0, defined as Tg-T0/Tx-T0-Tg-T0/Tn-T0, was proposed wherein Tg and T0 are glass transition temperature and Vogel temperature respectively. The parameter ω0 shows an excellent correlation with the critical cooling rate for glass formation of bulk metallic glasses, with the statistical correlation factor of R2=09626. Furthermore, the relationships between the GFA and Trg, ΔTx, γ, γm, ΔTrg, α, β, δ and φ, as well as the fragility of liquid could be explained reasonably based on our proposed ω0 parameter.