Nanocrystallization and Dissolution of Immiscible Powder Alloys Using High Pressure Torsion

Author(s)
Susi Kahofer, Michael Zehetbauer, Herbert Danninger, Erhard Schafler, Michael Kerber, Jelena Horky
Abstract

Precompacts out of immiscible systems CuCr (75/25 wt%) and WCu (80/20 wt%), respectively, were made by pressing mixed powders and sintering. By applying different strains and hydrostatic pressures of HPT at room temperature, disc-shaped samples with a diameter of 8 mm were produced. They were investigated by Light Microscopy, Scanning-Electron Microscopy using Back-Scattered Electrons, and X-ray Line Profile Analysis. In addition, Vickers microhardness data were collected. Both systems showed the highest microhardness at a shear strain of about gamma = 170. The density (for the case of Cu25Cr) of the consolidated material could be increased to the theoretical value. Microhardness and grain sizes were studied individually for each of the phases, too.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Technische Universität Wien, Universität Wien
Journal
Materials Science Forum
Volume
667-669
Pages
151-156
No. of pages
6
ISSN
0255-5476
DOI
https://doi.org/10.4028/www.scientific.net/MSF.667-669.151
Publication date
2010
Peer reviewed
Yes
Austrian Fields of Science 2012
1030 Physics, Astronomy, 210006 Nanotechnology, 103018 Materials physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/nanocrystallization-and-dissolution-of-immiscible-powder-alloys-using-high-pressure-torsion(d6106510-a802-4ecf-87c6-30ae1aaa6dc1).html