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Ductility of Nanocrystalline Materials Processed by Severe Plastic Deformation

Zbigniew Pakieła ,  Michal Miskiewicz ,  Krystian Paradowski ,  Anna Druzycka ,  Krzysztof J. Kurzydlowski 

Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland


Nanocrystalline materials are often examined in the form of small specimens. Problems arising in testing such specimens can be classified into 3 groups: a) difficulty in the machining and handling the specimens; b) applying loading and c) strain measurements.
The present study focused attention on the mechanical properties of nanocrystalline metals measured in tensile tests. The specimens were obtained via two severe plastic deformation (SPD): a) high-pressure torsion (HPT), b) cold rolling and c) equal channel angular pressing (ECAP).
Force-displacement curves have been recorded and strain field distribution within gauge sectios and in specimen heads measured. Interpretation of the experimental curves is carried out in terms of the true and apparent values of the flow stress and elongation to fracture.


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Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by Zbigniew Pakieła
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-07-18 15:30
Revised:   2009-06-08 12:55