Mechanical Properties and Microstructure Evolution during Deformation of Ultrafine Grained Zirconium at Low Temperatures

Autor(en)

Elena D. Tabachnikova, A. V. Podolskiy, Bartlomiej Bonarski, Clemens Mangler, Vladimir Z. Bengus, N.S. Smirnov, Alexei N. Velikodny, Michael A. Tikhonovsky, Michael Zehetbauer

Abstrakt

Mechanical properties of ultrafine grained (UFG) zirconium (grain size 200 nm), produced by a combination of extrusion, wire drawing and specific annealing, were studied at temperatures 4.2 - 300K in uniaxial compression and compared with coarse grained (CG) Zr. In parallel, investigations by X-ray diffraction (texture) and transmission electron microscopy were undertaken in order to reveal the evolution of the microstructure with increasing strain. Volume fractions of twins have been determined for UFG and CG Zr. It has been found that the activity of twinning is smaller in UFG Zr in comparison with CG Zr at ambient and lower temperatures, but the contrary is true for very low temperatures (4.2K), where twinning increases with decreasing grain size. The influence of twinning on mechanical properties of UFG Zr has been discussed, too.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

National Academy of Sciences of Ukraine (NASU)

Journal

Reviews on Advanced Materials Science

Band

25

Seiten

168-175

Anzahl der Seiten

8

ISSN

1606-5131

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/29f061c4-d5ec-4b2a-a1e1-46abe729b506