Measurements of the diffusion of iron and carbon in single crystal NiAl using ion implantation and secondary ion mass spectrometry

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Description

Classical diffusion measurements in intermetallic compounds are often complicated by low diffusivities or low solubilities of the elements of interest. Using secondary ion mass spectrometry for measurements over a relatively shallow spatial range may be used to solve the problem of low diffusivity. In order to simultaneously obtain measurements on important impurity elements with low solubilities, the authors have used ion implantation to supersaturate a narrow layer near the surface. Single crystal NiAl was implanted with either {sup 12}C or both {sup 56}Fe and {sup 12}C in order to investigate the measurement of substitutional (Fe) versus interstitial (C) tracer diffusion ... continued below

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7 p.

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Hanrahan, R.J. Jr.; Withrow, S.P. & Puga-Lambers, M. December 31, 1998.

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  • Hanrahan, R.J. Jr. Los Alamos National Lab., NM (United States). Materials Science and Technology Div.
  • Withrow, S.P. Oak Ridge National Lab., TN (United States). Solid State Div.
  • Puga-Lambers, M. Univ. of Florida, Gainesville, FL (United States)

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Description

Classical diffusion measurements in intermetallic compounds are often complicated by low diffusivities or low solubilities of the elements of interest. Using secondary ion mass spectrometry for measurements over a relatively shallow spatial range may be used to solve the problem of low diffusivity. In order to simultaneously obtain measurements on important impurity elements with low solubilities, the authors have used ion implantation to supersaturate a narrow layer near the surface. Single crystal NiAl was implanted with either {sup 12}C or both {sup 56}Fe and {sup 12}C in order to investigate the measurement of substitutional (Fe) versus interstitial (C) tracer diffusion and the cross effect of both substitutional and interstitial diffusion. When C alone was implanted negligible diffusion was observed over the range of times and temperatures investigated. When both Fe and C were implanted together significantly enhanced diffusion of the C was observed, which is apparently associated with the movement of Fe. This supports one theory of dynamic strain aging in Fe alloys NiAl.

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7 p.

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OSTI as DE99000773

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  • Materials Research Society, San Francisco, CA (United States), Nov 1998

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  • Other: DE99000773
  • Report No.: LA-UR--98-2190
  • Report No.: CONF-981124--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/296786 | External Link
  • Office of Scientific & Technical Information Report Number: 296786
  • Archival Resource Key: ark:/67531/metadc683401

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 2:56 p.m.

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Hanrahan, R.J. Jr.; Withrow, S.P. & Puga-Lambers, M. Measurements of the diffusion of iron and carbon in single crystal NiAl using ion implantation and secondary ion mass spectrometry, report, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683401/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.