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Development of Near-Surface Composition Anomaly

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Abstract

Many multi-element alloy specimens have been shown to possess a wide variety of near-surface elemental composition profiles, which are significantly different from the bulk composition. Such composition nonuniformity adversely affects the measurement of basic thermophysical properties in alloys. In this paper is presented a new investigation into the mechanisms by which such depth-dependent near-surface elemental composition develops. Specifically, specimens of a low melting-point metallic alloy, Wood's alloy, as a model system are examined under varying thermal cycling conditions within a chamber of controlled gaseous atmosphere. The near-surface composition and thermal diffusivity are measured as a function of depth. The method of time-resolved spectroscopy of laser-produced plasma plumes emanating from the specimen surface is used. Different surface composition profiles emerge depending on the dynamic range of the thermal cycling forced on a specimen.

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Authors and Affiliations

  1. Department of Physics, Lehigh University, Lewis Laboratory 16, Bethlehem, Pennsylvania, 18015, U.S.A.

    Yong W. Kim

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  1. Yong W. Kim
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Correspondence to Yong W. Kim.

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Kim, Y.W. Development of Near-Surface Composition Anomaly. International Journal of Thermophysics 25, 575–586 (2004). https://doi.org/10.1023/B:IJOT.0000028491.49665.c4

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  • DOI: https://doi.org/10.1023/B:IJOT.0000028491.49665.c4

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