Alternative processing methods for tungsten-base composite materials

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Tungsten composite materials contain large amounts of tungsten distributed in a continuous matrix phase. Current commercial materials include the tungsten-nickel-iron with cobalt replacing some or all of the iron, and also tungsten-copper materials. Typically, these are fabricated by liquid-phase sintering of blended powders. Liquid-phase sintering offers the advantages of low processing costs, established technology, and generally attractive mechanical properties. However, liquid-phase sintering is restricted to a very limited number of matrix alloying elements and a limited range of tungsten and alloying compositions. In the past few years, there has been interest in a wider range of matrix materials that offer ... continued below

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7 p.

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Ohriner, E.K. & Sikka, V.K. December 31, 1995.

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Description

Tungsten composite materials contain large amounts of tungsten distributed in a continuous matrix phase. Current commercial materials include the tungsten-nickel-iron with cobalt replacing some or all of the iron, and also tungsten-copper materials. Typically, these are fabricated by liquid-phase sintering of blended powders. Liquid-phase sintering offers the advantages of low processing costs, established technology, and generally attractive mechanical properties. However, liquid-phase sintering is restricted to a very limited number of matrix alloying elements and a limited range of tungsten and alloying compositions. In the past few years, there has been interest in a wider range of matrix materials that offer the potential for superior composite properties. These must be processed by solid-state processes and at sufficiently low temperatures to avoid undesired reactions between the tungsten and the matrix phase. These processes, in order of decreasing process temperature requirements, include hot-isostatic pressing (HIPing), hot extrusion, and dynamic compaction. The HIPing and hot extrusion processes have also been used to improve mechanical properties of conventional liquid-phase-sintered materials. Results of laboratory-scale investigations of solid-state consolidation of a variety of matrix materials, including titanium, hafnium, nickel aluminide, and steels are reviewed. The potential advantages and disadvantages of each of the possible alternative consolidation processes are identified. Postconsolidation processing to control microstructure and macrostructure is discussed, including novel methods of controlling microstructure alignment.

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7 p.

Notes

INIS; OSTI as DE96005360

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  • International conference on tungsten and refractory metals, McLean, VA (United States), 15-16 Nov 1995

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  • Other: DE96005360
  • Report No.: CONF-9511183--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 204707
  • Archival Resource Key: ark:/67531/metadc666246

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 15, 2016, 12:41 p.m.

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Ohriner, E.K. & Sikka, V.K. Alternative processing methods for tungsten-base composite materials, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc666246/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.