Nanostructure formation mechanism during in-situ consolidation of copper by room-temperature ball milling

Autor(en)

M. Samadi Khoshkhoo, S. Scudino, T. Gemming, J. Thomas, J. Freudenberger, M. Zehetbauer, C. C. Koch, J. Eckert

Abstrakt

Bulk nanostructured Cu was prepared by in-situ consolidation through room temperature ball milling. The consolidated parts consist of hollow spheres having a diameter which increases with increasing the milling time. Microhardness maps reveal that the distribution of the hardness is relatively homogeneous after 2 h of milling. After 34 h the hardness is higher at the outer edge and decreases toward the inner edge and, finally, after 70 h the distribution is uniform again. Electron microscopic results show that the microstructure after 70 h of milling consists of two types of grains: elongated ultrafine grains with high density of defects and equiaxed nanosized grains produced by dynamic recrystallization. Continuous dynamic recrystallization is the dominant mechanism for the formation of the nanosized grains. Evidence for the occurrence of discontinuous dynamic recrystallization through twinning was also found in a few regions of the in-situ consolidated samples.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Technische Universität Bergakademie Freiberg, North Carolina State University, Technische Universität Dresden

Journal

Materials & Design

Band

65

Seiten

1083-1090

Anzahl der Seiten

8

ISSN

0264-1275

DOI

https://doi.org/10.1016/j.matdes.2014.06.052

Publikationsdatum

01-2015

Peer-reviewed

Ja

ÖFOS 2012

210004 Nanomaterialien

Schlagwörter

ASJC Scopus Sachgebiete

Mechanics of Materials, Mechanical Engineering, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/93917576-a3dc-4967-a193-15f120a7a302