Ceramic composites with a ductile Ni{sub 3}Al binder phase

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Composites using B-doped ductile Ni{sub 3}Al alloys were produced with both non-oxide (WC, TiC) and oxide (Al{sub 2}0{sub 3}) ceramic powders. Typical powder processing techniques were used to fabricate materials with ceramic contents from 0-95 vol. %. The microstructural morphology of the composites depends primarily on the wetting behavior between the alloys and the ceramic powders. The non-oxide ceramic powders wet well and the Ni{sub 3}Al alloys form a semi-continuous intergranular phase. On the other hand, the Ni{sub 3}Al alloys do not wet the oxide powders well and tend to form discrete ``islands`` of the metallic phase. Wetting in these ... continued below

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9 p.

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Tiegs, T.N.; Alexander, K.B.; Plucknett, K.P.; Menchhofer, P.A.; Becher, P.F. & Waters, S.B. June 1, 1995.

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Composites using B-doped ductile Ni{sub 3}Al alloys were produced with both non-oxide (WC, TiC) and oxide (Al{sub 2}0{sub 3}) ceramic powders. Typical powder processing techniques were used to fabricate materials with ceramic contents from 0-95 vol. %. The microstructural morphology of the composites depends primarily on the wetting behavior between the alloys and the ceramic powders. The non-oxide ceramic powders wet well and the Ni{sub 3}Al alloys form a semi-continuous intergranular phase. On the other hand, the Ni{sub 3}Al alloys do not wet the oxide powders well and tend to form discrete ``islands`` of the metallic phase. Wetting in these materials can be improved by the addition of non-oxide particles, such as TiC. Results on the mechanical properties showed ambient temperature flexural strength similar to other Ni-based hardmetals. In contrast to the WC-Co materials, the flexural strength is retained to temperatures of at least 800 C. The fracture toughness and hardness were found to be equal or higher than comparable Co-based hardmetal systems. Initial corrosion tests showed excellent resistance to acid solutions.

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9 p.

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OSTI as DE95013352

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  • 5. international conference on the science of hard materials, Maui, HI (United States), 20-24 Feb 1995

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  • Other: DE95013352
  • Report No.: CONF-950245--3
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 82446
  • Archival Resource Key: ark:/67531/metadc780095

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  • June 1, 1995

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 15, 2016, 3:58 p.m.

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Tiegs, T.N.; Alexander, K.B.; Plucknett, K.P.; Menchhofer, P.A.; Becher, P.F. & Waters, S.B. Ceramic composites with a ductile Ni{sub 3}Al binder phase, article, June 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc780095/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.