Retained coarse grains in bulk nanocrystalline Ni3Al

Autor(en)

Christian Rentenberger, Hans-Peter Karnthaler

Abstrakt

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(en)

Physik Nanostrukturierter Materialien

Journal

International Journal of Materials Research

Band

98

Seiten

255-258

Anzahl der Seiten

4

ISSN

1862-5282

DOI

https://doi.org/10.3139/146.101463

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/bf0d1f8c-8e6b-4fb9-9c16-a31b2dbc87d1