Limitations in the refinement by severe plastic deformation: The effect of processing

Autor(en)

Andrea Bachmaier, Martin Hafok, Roman Schuster, Reinhard Pippan

Abstrakt

High Pressure Torsion (HPT) is a simple and effective severe plastic deformation method to produce ultrafine grained or even nanocrystalline microstructures. However, at a certain applied strain no further refinement of the microstructure occurs. HPT deformation of bulk Ni at room temperature leads to a typical saturation microstructure with a mean grain size of approximately 200 nm. In the present work, it will be shown that additional heavy cold rolling of a saturation microstructure does not help to overcome this limit. Furthermore, a strategy to bypass this limitation in the grain refinement using HPT deformation is presented. The main key lies in the reduction of grain boundary migration during the deformation. Thus bulk nanocrystalline Ni samples with an average grain size below 30 nm can be produced.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW)

Journal

Reviews on Advanced Materials Science

Band

25

Seiten

16-22

Anzahl der Seiten

7

ISSN

1606-5131

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

210006 Nanotechnologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/bda724d1-1513-4bcc-a7a4-87751a3e9dc7