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Cyclic deformation mechanisms in precipitated NiTi shape memory alloys

Publication ,  Journal Article
Gall, K; Maier, HJ
Published in: Acta Materialia
October 28, 2002

Results are presented on the cyclic deformation of single crystal NiTi containing Ti3Ni4 precipitates of various sizes. Mechanical cycling experiments reveal that the cyclic degradation resistance of NiTi is strongly dependent on crystallographic orientation. Under compression, orientations approaching the [100] pole of the stereographic triangle possess the highest fatigue resistance. Orientations approaching the [111] pole of the stereographic triangle demonstrate the lowest fatigue resistance. Aging to produce small coherent Ti3Ni4 precipitates (10 nm) improves the fatigue resistance of NiTi compared to the other heat treatments (solutionized or overaged) for nearly all orientations. NiTi with 10 nm Ti3Ni4 precipitates consistently showed stabilized martensite due to mechanical cycling, and an absence of dislocation activity. Samples with large incoherent Ti3Ni4 precipitates (500 nm) consistently showed significant dislocation activity due to mechanical cycling in addition to stabilized martensite colonies. The first cycle stress-strain hysteresis was found to correlate to the fatigue resistance of the material. Samples demonstrating large inherent hysteresis, with different heat treatments and orientations, showed poor fatigue performance. Rational for the observed behaviors is discussed in terms of operant deformation mechanisms and ramifications on modeling the cyclic deformation of NiTi are presented. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

Duke Scholars

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

October 28, 2002

Volume

50

Issue

18

Start / End Page

4643 / 4657

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

Citation

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Gall, K., & Maier, H. J. (2002). Cyclic deformation mechanisms in precipitated NiTi shape memory alloys. Acta Materialia, 50(18), 4643–4657. https://doi.org/10.1016/S1359-6454(02)00315-4
Gall, K., and H. J. Maier. “Cyclic deformation mechanisms in precipitated NiTi shape memory alloys.” Acta Materialia 50, no. 18 (October 28, 2002): 4643–57. https://doi.org/10.1016/S1359-6454(02)00315-4.
Gall K, Maier HJ. Cyclic deformation mechanisms in precipitated NiTi shape memory alloys. Acta Materialia. 2002 Oct 28;50(18):4643–57.
Gall, K., and H. J. Maier. “Cyclic deformation mechanisms in precipitated NiTi shape memory alloys.” Acta Materialia, vol. 50, no. 18, Oct. 2002, pp. 4643–57. Scopus, doi:10.1016/S1359-6454(02)00315-4.
Gall K, Maier HJ. Cyclic deformation mechanisms in precipitated NiTi shape memory alloys. Acta Materialia. 2002 Oct 28;50(18):4643–4657.
Journal cover image

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

October 28, 2002

Volume

50

Issue

18

Start / End Page

4643 / 4657

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics