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Strength and microstructure of powder metallurgy processed restacked Cu-Nb microcomposites

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Abstract

Powder metallurgy (PM) was used to fabricate Cu-Nb microcomposites both at the laboratory and intermediate industrial scales. Ultimate tensile strengths (UTSs) of 1.6 and 1.035 GPa were obtained for the laboratory-and intermediate-scale composites, respectively. Filament morphology and the microstructure of various microcomposites were examined with transmission electron microscopy (TEM), scanning electron microscopy (SEM), and optical microscopy. In the early stages of the fabrication process, a plain strain condition causes the Nb fibers to attain a ribbonlike shape, but in the later stages, an axially symmetric flow prevails. Beyond the Nb filament thickness of 5 to 10 nm, the overall areal reduction was observed to occur without any significant reduction in the Nb filament thickness. Effects of heat treatment and the extent of spheroidization at different temperatures were studied. Contributions of various strengthening mechanisms on PM-processed Cu-Nb composites were analyzed. Work hardening, high strength of Nb filaments, and dispersion-type hardening were the dominant factors. Our strengthening model, which involves a superposition of the different contributions, agreed with our measurements.

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Authors and Affiliations

  1. Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, 02139, Cambridge, MA

    S. Pourrahimi (Staff Member) & S. Foner (Associate Director)

  2. Department of Mechanical Engineering, Northeastern University, 02115, Boston, MA

    H. Nayeb-Hashemi (Associate Professor)

Authors
  1. S. Pourrahimi
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  2. H. Nayeb-Hashemi
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  3. S. Foner
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Pourrahimi, S., Nayeb-Hashemi, H. & Foner, S. Strength and microstructure of powder metallurgy processed restacked Cu-Nb microcomposites. Metall Trans A 23, 573–586 (1992). https://doi.org/10.1007/BF02801175

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  • DOI: https://doi.org/10.1007/BF02801175

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