Temperature-dependent structure of {bold a}(10{bar 1}) superdislocations in Ni{sub 3}Al

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The dissociated structure of the a(101) superdislocations in Ni{sub 3}Al is predicted as a function of temperature. The temperature dependence of the relevant fault Helmholtz free energies and elastic constants are calculated within the quasiharmonic approximation using the embedded atom method, Results of these calculations are then incorporated into anisotropic elasticity theory-based calculations of the dissociation distances. The cross-slip activation enthalpy is estimated and found to decrease by 24% at 600 K when compared with its 0 K value. The calculations point to the need to perform experiments to address this temperature dependence.

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6 p.

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Chrzan, D.C.; Foiles, S.M.; Daw, M.S. & Mills, M.J. December 31, 1994.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Livermore, CA (United States)
    Place of Publication: Livermore, California

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The dissociated structure of the a(101) superdislocations in Ni{sub 3}Al is predicted as a function of temperature. The temperature dependence of the relevant fault Helmholtz free energies and elastic constants are calculated within the quasiharmonic approximation using the embedded atom method, Results of these calculations are then incorporated into anisotropic elasticity theory-based calculations of the dissociation distances. The cross-slip activation enthalpy is estimated and found to decrease by 24% at 600 K when compared with its 0 K value. The calculations point to the need to perform experiments to address this temperature dependence.

Physical Description

6 p.

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OSTI as DE95010755

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95010755
  • Report No.: SAND--95-8525C
  • Report No.: CONF-941144--153
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 88664
  • Archival Resource Key: ark:/67531/metadc794852

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  • December 31, 1994

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • April 12, 2016, 8:21 p.m.

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Chrzan, D.C.; Foiles, S.M.; Daw, M.S. & Mills, M.J. Temperature-dependent structure of {bold a}(10{bar 1}) superdislocations in Ni{sub 3}Al, article, December 31, 1994; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc794852/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.