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

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), a...

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Bibliographic Details
Published in:Metallography, microstructure, and analysis microstructure, and analysis, 2014-02, Vol.3 (1), p.46-57
Main Authors: Kreitcberg, A., Brailovski, V., Prokoshkin, S., Inaekyan, K.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Materials Science
Metallic Materials
Nanotechnology
Structural Materials
Surfaces and Interfaces
Technical Article
Thin Films
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Summary: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.
ISSN:2192-9262
2192-9270
DOI:10.1007/s13632-013-0114-4