Reaction synthesis and processing of nickel and iron aluminides

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Composites of Ni and Fe aluminides were obtained by hot pressing and hot extrusion of a blended mixture of Ni and Al or Fe and Al with ceramic phases such as TiC, ZrO{sub 2}, and Al{sub 2}O{sub 3}. Aluminides were analyzed by XRD to determine the phase structures, and optical and scanning electron microscopies were used to determine the grain sizes of the aluminides and dispersion of ceramics. Tensile properties (0.2% YS, UTS, total elong., RIA) were measured on buttonhead and sheet specimens of Ni and Fe aluminides and their composites at room and high temperatures in air at a ... continued below

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20 p.

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Deevi, S.C. & Sikka, V.K. December 31, 1996.

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  • Deevi, S.C. Philip Morris U.S.A., Richmond, VA (United States). Research Center
  • Sikka, V.K. Oak Ridge National Lab., TN (United States)

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Description

Composites of Ni and Fe aluminides were obtained by hot pressing and hot extrusion of a blended mixture of Ni and Al or Fe and Al with ceramic phases such as TiC, ZrO{sub 2}, and Al{sub 2}O{sub 3}. Aluminides were analyzed by XRD to determine the phase structures, and optical and scanning electron microscopies were used to determine the grain sizes of the aluminides and dispersion of ceramics. Tensile properties (0.2% YS, UTS, total elong., RIA) were measured on buttonhead and sheet specimens of Ni and Fe aluminides and their composites at room and high temperatures in air at a strain rate of 1. 2x10{sup -3}/s. Tensile properties of Fe-8 wt% Al from partial mechanical alloying and then combustion synthesis compare very well with oxide-dispersed alloys of Fe. Fe aluminides of FeAl and their composites, based on Fe-24 wt% Al from hot pressing of Fe and Al powders with or without ceramic phases, exhibited full densities and uniform grain sizes. Tensile properties of FeAl and composites (hot pressing of elemental powders) were excellent compared to those of FeAl alloys from hot extrusion of water-atomized powders. Fe aluminides were also obtained by hot extrusion of Fe and Al powders at 950, 1000, and 1100 C.

Physical Description

20 p.

Notes

OSTI as DE97001298

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  • American Society of Mechanical Engineers (ASME) and Metals materials week, Cincinnati, OH (United States), 6-10 Oct 1996

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  • Other: DE97001298
  • Report No.: CONF-961017--13
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 436292
  • Archival Resource Key: ark:/67531/metadc676997

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 22, 2016, 3:59 p.m.

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Deevi, S.C. & Sikka, V.K. Reaction synthesis and processing of nickel and iron aluminides, article, December 31, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc676997/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.