Neutron diffraction study of NiTi during compressive deformation and after shape-memory recovery

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Neutron diffraction measurements of internal elastic strains and texture were performed during compressive deformation of martensitic NiTi deforming by twinning. Rietveld refinement of the diffraction spectrum was performed in order to obtain lattice parameter variations and preferred orientation of martensitic variants. The elastic internal strains, are proportional to the externally applied stress but strongly dependent on crystallographic orientation. Plastic deformation by matrix twinning is consistent with type I (1-1-1) twinning, whereby (100) and (011) planes tend to align perpendicular and parallel to the stress axis, respectively. The preferred orientation ratio r according to the model by March and Dollase is ... continued below

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[10] p. ; 28 cm.

Creation Information

Dunand, D. C.; Mari, D.; Bourke, M. A. M. & Goldstone, J. A. September 1995.

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  • Dunand, D. C. Massachusett Inst. of Technology, Cambridge, MA (United States). Dept. of Materials Science and Engineering
  • Mari, D. Massachusett Inst. of Technology, Cambridge, MA (United States). Dept. of Materials Science and Engineering
  • Bourke, M. A. M. Los Alamos National Lab, NM (United States)
  • Goldstone, J. A. Los Alamos National Lab, NM (United States)

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Description

Neutron diffraction measurements of internal elastic strains and texture were performed during compressive deformation of martensitic NiTi deforming by twinning. Rietveld refinement of the diffraction spectrum was performed in order to obtain lattice parameter variations and preferred orientation of martensitic variants. The elastic internal strains, are proportional to the externally applied stress but strongly dependent on crystallographic orientation. Plastic deformation by matrix twinning is consistent with type I (1-1-1) twinning, whereby (100) and (011) planes tend to align perpendicular and parallel to the stress axis, respectively. The preferred orientation ratio r according to the model by March and Dollase is proportional to the macroscopic plastic strain for (100) and (011) planes for loading, unloading and shape-memory recovery. To the best of our knowledge, this is the first in situ bulk measurement of reversible twinning in NiTi. Finally, shape-memory recovery results in a marked change of NiTi cell parameters.

Physical Description

[10] p. ; 28 cm.

Source

  • 8. international conference on martensitic transformations (ICOMAT-8), Lausanne (Switzerland), 20-25 Aug 1995

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  • Other: DE95016835
  • Report No.: LA-UR--95-2345
  • Report No.: CONF-9508145--2
  • DOI: 10.2172/100006 | External Link
  • Office of Scientific & Technical Information Report Number: 100006
  • Archival Resource Key: ark:/67531/metadc613716

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Creation Date

  • September 1995

Added to The UNT Digital Library

  • June 10, 2015, 6:48 p.m.

Description Last Updated

  • May 16, 2016, 11:52 a.m.

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Dunand, D. C.; Mari, D.; Bourke, M. A. M. & Goldstone, J. A. Neutron diffraction study of NiTi during compressive deformation and after shape-memory recovery, report, September 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc613716/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.