Texture evolution in upset-forged P/M and wrought tantalum: Experimentation and modeling

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Preferred orientations in polycrystalline materials can significantly affect their physical and mechanical response through the retention of anisotropic properties inherent to the single crystal. In this study the texture evolution in upset-forged PIM and wrought tantalum was measured as a function of initial texture, compressive strain, and relative position in the pressing. A <001>/<111> duplex fiber texture parallel to the compression axis was generally observed, with varying degrees of a radial component evident in the wrought material. The development of deformation textures derives from restricted crystallographic slip conditions that generate lattice rotations, and these grain reorientations can be modeled as ... continued below

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13 p.

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Bingert, J.F.; Desch, P.B.; Bingert, S.R.; Maudlin, P.J. & Tome, C.N. November 1, 1997.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Materials Science and Technology Div., NM (United States)
    Place of Publication: New Mexico

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Description

Preferred orientations in polycrystalline materials can significantly affect their physical and mechanical response through the retention of anisotropic properties inherent to the single crystal. In this study the texture evolution in upset-forged PIM and wrought tantalum was measured as a function of initial texture, compressive strain, and relative position in the pressing. A <001>/<111> duplex fiber texture parallel to the compression axis was generally observed, with varying degrees of a radial component evident in the wrought material. The development of deformation textures derives from restricted crystallographic slip conditions that generate lattice rotations, and these grain reorientations can be modeled as a function of the prescribed deformation gradient. Texture development was simulated for equivalent deformations using both a modified Taylor approach and a viscoplastic self-consistent (VPSC) model. A comparison between the predicted evolution and experimental results shows a good correlation with the texture components, but an overly sharp prediction at large strains from both the Taylor and VPSC models.

Physical Description

13 p.

Notes

INIS; OSTI as DE98002924

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  • 1997 international conference on tungsten, refractory metals and alloys, Lake Buena Vista, FL (United States), 17-19 Nov 1997

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  • Other: DE98002924
  • Report No.: LA-UR--97-4469
  • Report No.: CONF-971168--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/645554 | External Link
  • Office of Scientific & Technical Information Report Number: 645554
  • Archival Resource Key: ark:/67531/metadc697804

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  • November 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 3, 2016, 1:35 p.m.

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Bingert, J.F.; Desch, P.B.; Bingert, S.R.; Maudlin, P.J. & Tome, C.N. Texture evolution in upset-forged P/M and wrought tantalum: Experimentation and modeling, report, November 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc697804/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.