Thermodynamics and kinetics of the Mg{sub 65}Cu{sub 25}Y{sub 10} bulk metallic glass forming liquid

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.367167· OSTI ID:625373

Busch, R; Liu, W; Johnson, W L ^[1]

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1. California Institute of Technology, W. M. Keck Laboratory of Engineering Materials, 138-78, Pasadena, California91125 (United States)

The thermodynamics and kinetics of the bulk metallic glass forming Mg{sub 65}Cu{sub 25}Y{sub 10} liquid were investigated using differential scanning calorimetry and three-point beam bending. The experiments lead to the determination of the thermodynamic functions as well as the viscosity of the supercooled liquid. The viscosity shows a temperature dependence, which is consistent with that of a strong glass similar to Zr{endash}Ti{endash}Cu{endash}Ni{endash}Be bulk metallic glasses or sodium silicate glasses. This contrasts with more fragile conventional metallic glass formers or pure metals. The relatively weak temperature dependence of the thermodynamic functions of the supercooled liquid is related to these sluggish kinetics in the supercooled liquid. Entropy, viscosity, and kinetic glass transition are compared in the frameworks of the fragility concept and the Adam{endash}Gibbs theory. Strong liquid behavior retards the formation of crystals kinetically and thermodynamically. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 625373
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 83; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
COPPER ALLOYS
DIFFERENTIAL THERMAL ANALYSIS
ENTROPY
MAGNESIUM ALLOYS
METALLIC GLASSES
SPECIFIC HEAT
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
VISCOSITY
YTTRIUM ALLOYS