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Densification behavior of tungsten heavy alloy based on master sintering curve concept

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Abstract

The master sintering curve (MSC) theory is modified by substituting the densification ratio (φ) for the densification parameter (ψ) to identify regions where shrinkage occurs by a similar combination of sintering mechanisms. The modified MSC theory is used to analyze the results of dilatometry experiments conducted with W-Ni-Fe heavy alloys, in which a phase change occurs during sintering. Apparent activation energies for sintering in three regions (solid state, transition, and liquid phase) are calculated. These activation energies are compared with experimental values for diffusion and other mass-transport phenomena to identify the dominant mechanisms in each region. A series of master sinter curves for varying W contents are developed into a master sintering surface that includes tungsten content and integral work.

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Authors and Affiliations

  1. the Center for Advanced Vehicular Systems, Mississippi State University, 39762, Mississippi State, MS

    S. J. Park (Associate Research Professor) & Randall M. German (Director and CAVS Chair Professor of Mechanical Engineering)

  2. the Centro de Estudios e Investigaciones Técnicas de Guipúzcoa (CEIT) and TECNUN, 20018, San Sebastián, Spain

    J. M. Martin (Staff Researcher)

  3. the Center for Innovative Sintered Products, CISP Lab, The Pennsylvania State University, 16802, University Park, PA

    J. F. Guo (Graduate Student)

  4. Break-through Technology, Kennametal Inc., 15650, Latrobe, PA

    J. L. Johnson (Staff Engineer)

Authors
  1. S. J. Park
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  2. Randall M. German
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  3. J. M. Martin
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  4. J. F. Guo
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  5. J. L. Johnson
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Park, S.J., German, R.M., Martin, J.M. et al. Densification behavior of tungsten heavy alloy based on master sintering curve concept. Metall Mater Trans A 37, 2837–2848 (2006). https://doi.org/10.1007/BF02586116

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  • DOI: https://doi.org/10.1007/BF02586116

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