Point defect concentrations and solid solution hardening in NiAl with Fe additions

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The solid solution hardening behavior exhibited when Fe is added to NiAl is investigated. This is an interesting problem to consider since the ternary Fe additions may choose to occupy either the Ni or the Al sublattice, affecting the hardness at differing rates. Moreover, the addition of Fe may affect the concentrations of other point defects such as vacancies and Ni anti-sites. As a result, unusual effects ranging from rapid hardening to solid solution softening are observed. Alloys with varying amounts of Fe were prepared in Ni-rich (40 at. % Al) and stoichiometric (50 at. % Al) compositions. Vacancy concentrations ... continued below

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6 p.

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Pike, L.M.; Chang, Y.A. & Liu, C.T. August 1, 1997.

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  • Pike, L.M.
  • Chang, Y.A. Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
  • Liu, C.T. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

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Description

The solid solution hardening behavior exhibited when Fe is added to NiAl is investigated. This is an interesting problem to consider since the ternary Fe additions may choose to occupy either the Ni or the Al sublattice, affecting the hardness at differing rates. Moreover, the addition of Fe may affect the concentrations of other point defects such as vacancies and Ni anti-sites. As a result, unusual effects ranging from rapid hardening to solid solution softening are observed. Alloys with varying amounts of Fe were prepared in Ni-rich (40 at. % Al) and stoichiometric (50 at. % Al) compositions. Vacancy concentrations were measured using lattice parameter and density measurements. The site occupancy of Fe was determined using ALCHEMI. Using these two techniques the site occupancies of all species could be uniquely determined. Significant differences in the defect concentrations as well as the hardening behavior were encountered between the Ni-rich and stoichiometric regimes.

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6 p.

Notes

OSTI as DE97007774

Source

  • 2. international symposium on structural intermetallics, Champion, PA (United States), 21-26 Sep 1997

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  • Other: DE97007774
  • Report No.: CONF-970909--2
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/537325 | External Link
  • Office of Scientific & Technical Information Report Number: 537325
  • Archival Resource Key: ark:/67531/metadc691357

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Creation Date

  • August 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 20, 2016, 12:02 p.m.

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Pike, L.M.; Chang, Y.A. & Liu, C.T. Point defect concentrations and solid solution hardening in NiAl with Fe additions, report, August 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc691357/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.