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Metallography, Microstructure, and Analysis

, Volume 3, Issue 1, pp 46–57 | Cite as

Influence of Thermomechanical Treatment on Structure and Crack Propagation in Nanostructured Ti–50.26 at%Ni Alloy

  • A. Kreitcberg
  • V. BrailovskiEmail author
  • S. Prokoshkin
  • K. Inaekyan
Technical Article

Abstract

The fatigue propagation of processing-induced microcracks in severely deformed Ti–50.26 at%Ni alloy’s samples was investigated. The processing schedules included cold rolling (CR) with logarithmic strains of ɛ = 0.75 and 1.2, and a combination of CR(ɛ = 1), intermediate annealing (400 °C, 1 h), and warm rolling (ɛ = 0.2, T = 150 °C). The final step of the thermomechanical processing schedules consisted of post-deformation annealing at 400 °C, 1 h. The resulting microstructures were studied using transmission electron microscopy. Using optical microscopy, the processing-induced edge cracks’ lengths and concentrations were measured before and after multicycle superelastic and stress generation/relaxation testing. From the functional fatigue point of view, nanocrystalline (NC) microstructure demonstrated higher tolerance to small cracks than mixed NC + nanosubgrained structure.

Keywords

Rolling Electron microscopy Mechanical testing Optical microscopy Failure analysis 

Notes

Acknowledgments

The authors are grateful to the Natural Sciences and Engineering Research Council of Canada and to the Ministry of Education and Science of the Russian Federation for their financial support of the present work.

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Copyright information

© Springer Science+Business Media New York and ASM International 2014

Authors and Affiliations

  • A. Kreitcberg
    • 1
    • 2
  • V. Brailovski
    • 1
    Email author
  • S. Prokoshkin
    • 2
  • K. Inaekyan
    • 1
  1. 1.Ecole de Technologie SupérieureMontrealCanada
  2. 2.National University of Science and Technology “MISIS”MoscowRussia

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