In situ examination of moving crack tips in ordered intermetallics.

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Recent studies have shown that high stress concentrations at moving crack tips in the intermetallic compound NiTi can induce a crystalline-to-amorphous (C-A) transformation of the crack tip region. This stress-induced C-A transformation has a temperature dependence and crystallization behavior similar to those of ion irradiation-induced C-A transformation of NiTi. The present study examines if these similarities between stress- and irradiation-induced amorphization hold true for two other intermetallic compounds, CuTi and Ni{sub 3}Ti. In situ straining was performed in an intermediate-voltage transmission electron microscope. The presence or absence of an amorphous phase was determined by dark field imaging and selected area ... continued below

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9 p.

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Heuer, J.; Lam, N. Q.; Okamoto, P. R. & Stubbins, J. F. January 25, 1999.

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Description

Recent studies have shown that high stress concentrations at moving crack tips in the intermetallic compound NiTi can induce a crystalline-to-amorphous (C-A) transformation of the crack tip region. This stress-induced C-A transformation has a temperature dependence and crystallization behavior similar to those of ion irradiation-induced C-A transformation of NiTi. The present study examines if these similarities between stress- and irradiation-induced amorphization hold true for two other intermetallic compounds, CuTi and Ni{sub 3}Ti. In situ straining was performed in an intermediate-voltage transmission electron microscope. The presence or absence of an amorphous phase was determined by dark field imaging and selected area diffraction of crack tip regions. Crack tips in both CuTi and Ni{sub 3}Ti were found to remain crystalline upon fracture. The observed absence of stress-induced amorphization in Ni{sub 3}Ti is consistent with its known absence during irradiation, but the absence in CuTi differs from its known irradiation-induced amorphization behavior. Reasons for the similarity and difference are discussed.

Physical Description

9 p.

Notes

OSTI as DE00012368

Medium: P; Size: 9 pages

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  • 1998 Fall Meeting of the Materials Research Society, Boston, MA (US), 11/30/1998--12/04/1998

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  • Report No.: ANL/MSD/CP-98330
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 12368
  • Archival Resource Key: ark:/67531/metadc624756

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  • January 25, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 8:18 p.m.

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Heuer, J.; Lam, N. Q.; Okamoto, P. R. & Stubbins, J. F. In situ examination of moving crack tips in ordered intermetallics., article, January 25, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc624756/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.