Retained coarse grains in bulk nanocrystalline Ni3Al

Author(s)
Christian Rentenberger, Hans-Peter Karnthaler
Abstract

Transmission electron microscopy methods were used to study the nanocrystalline structure achieved by severe plastic deformation of L12 long-range ordered Ni3Al. The deformation by high-pressure torsion (up to 40000 %) leads to a duplex structure consisting of a disordered nanocrystalline and an ordered coarse-grained structure carrying different shear strains. The volume fraction of the nanocrystalline structure increases with strain but varies locally. During the deformation micrometer sized coarse-grained volumes embedded in the nanocrystalline structure are retained; they show a predominance of orientations of high symmetry. This leads to the conclusion that the stability of the coarse grains results from their homogeneous slip caused by a homogeneous activation of the slip systems.

Organisation(s)
Physics of Nanostructured Materials
Journal
International Journal of Materials Research
Volume
98
Pages
255-258
No. of pages
4
ISSN
1862-5282
DOI
https://doi.org/10.3139/146.101463
Publication date
2007
Peer reviewed
Yes
Austrian Fields of Science 2012
1030 Physics, Astronomy
Portal url
https://ucris.univie.ac.at/portal/en/publications/retained-coarse-grains-in-bulk-nanocrystalline-ni3al(bf0d1f8c-8e6b-4fb9-9c16-a31b2dbc87d1).html