Simulations of creep in ductile-phase toughened Nb{sub 5}Si{sub 3}/Nb in-situ composites

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The primary and steady-state creep behavior of ductile-phase toughened Nb{sub 5}Si{sub 3}/Nb in-situ composites has been simulated using analytical and finite element (FE) continuum techniques. The microstructure of these composites is complex, consisting of large, elongated primary dendrites of the ductile (Nb) solid-solution phase in a eutectoid matrix with the silicide as the continuous phase. This microstructure has been idealized to facilitate the modeling; the effects of these idealizations on the predicted composite creep rates are discussed. Further, it has been assumed that the intrinsic creep behavior of each phase within the composite is the same as that of the ... continued below

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6 p.

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Henshall, G. A.; Strum, M. J.; Subramanian, P. R. & Mendiratta, M. G. November 28, 1994.

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Description

The primary and steady-state creep behavior of ductile-phase toughened Nb{sub 5}Si{sub 3}/Nb in-situ composites has been simulated using analytical and finite element (FE) continuum techniques. The microstructure of these composites is complex, consisting of large, elongated primary dendrites of the ductile (Nb) solid-solution phase in a eutectoid matrix with the silicide as the continuous phase. This microstructure has been idealized to facilitate the modeling; the effects of these idealizations on the predicted composite creep rates are discussed. Further, it has been assumed that the intrinsic creep behavior of each phase within the composite is the same as that of the corresponding bulk material. Thus, the experimentally measured creep properties of the bulk Nb{sub 5}Si{sub 3} and (Nb) phases have been analyzed to provide the required material constants in the creep constitutive equation. Model predictions of the steady-state composite creep rate have been compared with the experimental results for a Nb-10 at.% Si alloy. While accurate at low stress, the models under predict the composite creep rate at large stresses because the composite stress exponent is under predicted. In the case of primary creep, the models somewhat over predict the composite creep strain but are reasonably accurate given uncertainties in the primary creep data. Finally, FE predictions of the tensile stress distributions within the composites have been shown to be qualitatively consistent with the cracking observed experimentally during tertiary creep.

Physical Description

6 p.

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OSTI as DE96002655

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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: DE96002655
  • Report No.: UCRL-JC--119224
  • Report No.: CONF-941144--177
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/161524 | External Link
  • Office of Scientific & Technical Information Report Number: 161524
  • Archival Resource Key: ark:/67531/metadc622715

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  • November 28, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 12:15 p.m.

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Henshall, G. A.; Strum, M. J.; Subramanian, P. R. & Mendiratta, M. G. Simulations of creep in ductile-phase toughened Nb{sub 5}Si{sub 3}/Nb in-situ composites, report, November 28, 1994; California. (digital.library.unt.edu/ark:/67531/metadc622715/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.