Texture evolution in upset-forged P/M and wrought tantalum: Experimentation and modeling
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.
- Research Organization:
- Los Alamos National Lab., Materials Science and Technology Div., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 645554
- Report Number(s):
- LA-UR-97-4469; CONF-971168-; ON: DE98002924; TRN: 98:009949
- Resource Relation:
- Conference: 1997 international conference on tungsten, refractory metals and alloys, Lake Buena Vista, FL (United States), 17-19 Nov 1997; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
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