Surface carbon films on Al-Cu-Fe quasicrystalline powders

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Description

In order to study the unique properties of quasicrystals, it is necessary to form dense, homogeneous monoliths of these alloys. Unfortunately, Al-Cu-Fe quasicrystalline alloy ingots prepared by conventional casting techniques result in large scale chemical inhomogeneities which contain numerous cracks due to differential thermal contraction between the various phases during cooling. Thus a powder metallurgical approach using gas atomized (GA) powders is being pursued in order to form large samples of phase pure Al-Cu-Fe quasicrystal. A samples of specific compositions and sizes are hot isostatic pressed (HIPed) to form dense monoliths. The effects of surface contamination of GA powders, which ... continued below

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5 p.

Creation Information

Bloomer, T.E.; Flumerfelt, J. & Kramer, M.J. December 31, 1996.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 15 times . More information about this report can be viewed below.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

In order to study the unique properties of quasicrystals, it is necessary to form dense, homogeneous monoliths of these alloys. Unfortunately, Al-Cu-Fe quasicrystalline alloy ingots prepared by conventional casting techniques result in large scale chemical inhomogeneities which contain numerous cracks due to differential thermal contraction between the various phases during cooling. Thus a powder metallurgical approach using gas atomized (GA) powders is being pursued in order to form large samples of phase pure Al-Cu-Fe quasicrystal. A samples of specific compositions and sizes are hot isostatic pressed (HIPed) to form dense monoliths. The effects of surface contamination of GA powders, which may inhibit particle-to-particle sintering and may also increase second phase contamination in the HIPed piece, is being studied by scanning Auger microprobe (SAM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).

Physical Description

5 p.

Notes

OSTI as DE97002390

Source

  • Quasicrystal conference: new frontiers in quasicrystals - research and applications, Ames, IA (United States), 19-23 Aug 1996

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  • Other: DE97002390
  • Report No.: IS-M--863
  • Report No.: CONF-960872--1
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/432954 | External Link
  • Office of Scientific & Technical Information Report Number: 432954
  • Archival Resource Key: ark:/67531/metadc678317

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 6, 2015, 9 p.m.

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Bloomer, T.E.; Flumerfelt, J. & Kramer, M.J. Surface carbon films on Al-Cu-Fe quasicrystalline powders, report, December 31, 1996; Iowa. (digital.library.unt.edu/ark:/67531/metadc678317/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.