High Pressure Torsion of dual phase materials

Reinhard Pippan 1Florian Wetscher Andreas Vorhauer Ilshat Sabirov 

1. Erich Schmid Institute of Materials Science, OEAW (ESI), Jahnstrasse 12, Leoben A-8700, Austria

Abstract

High Pressure Torsion (HPT) is a well known procedure to obtain nano- and sub-micrometer grained microstructures in bulk materials. The paper is separated into two parts.
The first one is devoted to the HPT technique itself. A careful analysis of the homogeneity of the deformation during HPT is performed in order to understand the peculiar behavior described in the literature. Even at large numbers of revolutions a nearly idealized torsion deformation is observed. Reasons for the reported deviation between observations and ideal torsion deformation are discussed.
The second part is devoted to HPT-deformation of dual phase materials. The behavior in this type of materials is more complex than in single phase materials. It varies from simple homogenization, fragmentation of one phase, to disintegration and supersaturation of the phases. Examples for the different mechanisms are presented.

 

Presentation: invited oral at E-MRS Fall Meeting 2005, Symposium I, by Reinhard Pippan
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-06-22 08:45
Revised:   2009-06-07 00:44