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Hafnium- and Titanium-Coated Tungsten Powders for Kinetic Energy Penetrators, Phase 1, SBIR

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Final rept.

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Depleted uranium DU is the state-of-the-art material for kinetic energy penetrators used to defeat steel and composite armors. DU alloys, however, are costly to fabricate, handle, and store because of their extremely complex metallurgy and the obvious health considerations associated with the use of uranium. Tungsten composite materials are also used in kinetic energy penetrators, offering easier and safer fabrication, handling, and storage but to date lacking the performance of DU. The mechanisms by which a penetrator defeats an armor are difficult to determine, either experimentally or from first principles. Recent experiments have identified the presence of an adiabatic shear mechanism that appears to be important in the penetration of rolled homogeneous armor RHA by DU penetrators. In this program, Ultramet proposed to apply hafnium and titanium coatings to tungsten powder Wp particles by chemical vapor deposition CVD using an established fluidized-bed powder coating technique. Both hafnium and titanium are known to exhibit the adiabatic shear phenomenon. High strain rate experiments approx.10 to the 4th powersec were performed on Ti6A1-4V and hafnium materials in order to establish the presence or absence of this mode of deformation in small cylindrical specimens. In addition, specimens of 2 wt CVD HfWp and 2 wt CVD Hf 8 wt powder-mixed HfWp were tested at high strain rate conditions approx. 10 to the 4th powersec. Tungsten powders, Composites, Chemical Vapor DepositionCVD, Microstructure, Hafnium, Titanium, Dynamic tests, Strain rate testing, Powder metallurgy.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Metallurgy and Metallography
  • Ammunition and Explosives

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