Busch, R. and Kim, Y. J. and Johnson, W. L. and Rulison, A. J. and Rhim, W. K. and Isheim, D. (1995) Hemispherical total emissivity and specific heat capacity of deeply undercooled Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 melts. Applied Physics Letters, 66 (23). pp. 3111-3113. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:BUSapl95b
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High-temperature high-vacuum electrostatic levitation (HTHVESL) and differential scanning calorimetry (DSC) were combined to determine the hemispherical total emissivity epsilon T, and the specific heat capacity cp, of the undercooled liquid and throughout the glass transition of the Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk metallic glass forming alloy. The ratio of cp/epsilon T as a function of undercooling was determining from radiative cooling curves measured in the HTHVESL. Using specific heat capacity data obtained by DSC investigations close to the glass transition and above the melting point, epsilon T and cp were separated and the specific heat capacity of the whole undercooled liquid region was determined. Furthermore, the hemispherical total emissivity of the liquid was found to be about 0.22 at 980 K. On undercooling the liquid, the emissivity decreases to approximately 0.18 at about 670 K, where the undercooled liquid starts to freeze to a glass. No significant changes of the emissivity are observed as the alloy undergoes the glass transition.
|Additional Information:||©1995 American Institute of Physics. (Received 20 December 1994; accepted 13 March 1995) The authors would like to thank S. Schneider and S. Chung for valuable help and fruitful discussions. This work was supported by the Humboldt Foundation via the Feodor Lynen Program, the Department of Energy (Grant No. DEFG-03-86ER45242) and the National Aeronautics and Space Administration (Grant No. NAG8-954).|
|Subject Keywords:||ZIRCONIUM ALLOYS; TITANIUM ALLOYS; COPPER ALLOYS; NICKEL ALLOYS; BERYLLIUM ALLOYS; METALLIC GLASSES; PHASE TRANSFORMATIONS; SOLIDIFICATION; COOLING; CALORIMETRY; SPECIFIC HEAT; EMISSIVITY; GLASS TRANSFORMATIONS; SUPERCOOLED LIQUIDS|
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|Deposited On:||23 Feb 2006|
|Last Modified:||26 Dec 2012 08:46|
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