Surface Position-Resolved Thermophysical Properties for Metallic Alloys |
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Authors: | Y W Kim |
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Affiliation: | (1) Department of Physics, Lewis Laboratory 16, Lehigh University, Bethlehem, Pennsylvania, 18015, U.S.A. |
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Abstract: | Thermophysical properties are collective measures of a material to transport dynamical quantities of physical nature on its
surface or through the bulk. As such, the exact nature of couplings between particles in a many-body assembly of building
block atoms or molecules sensitively determines their values. The couplings between nearest neighbors are the product of the
local elemental composition and the material phase. In this study, thermal cycling of a four-element Wood’s alloy specimen
brings out cadmium-rich patches to the top surface of the specimen. An assembly of such patches leads to depth-dependent deviations
of elemental composition from that of the bulk. Surface-layer atoms are driven to form a high temperature laser-produced plasma
(LPP), and time-resolved spectroscopy of their emissions show the variability of elemental composition over surface positions
as well as over depth from the surface. These thermal history-driven composition anomalies contribute to significant variability
in the measured values of spectral emissivity and thermal diffusivity. |
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Keywords: | Benard– Marangoni instability near-surface composition anomaly position-resolved composition Wood’ s alloy |
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