Non-microscopical methods for characterization of microstructures and properties of UFG metals

Autor(en)

Michael Zehetbauer, Erhard Schafler, Tamas Ungar

Abstrakt

The paper reports on non-microscopical methods which allow for close investigation of ultrafine-grained metals especially of those processed by different techniques of Severe Plastic Deformation. These are as follows: (i) X-ray Bragg profile analysis, (ii) electrical residual resistivity, (iii) annealing calorimetry, and (iv) positron annihilation spectroscopy. The advantage of these methods lies in their integration/averaging over a certain sample volume so that they are often much closer to macroscopic physical properties than methods of microscopy; furthermore, the values of quantities obtained are more reliable because of strictly objective rules of determination. Typical quantities being relevant for ultra-fine grained materials are (a) grain size and grain size distribution, (b) long range internal stresses, (c) dislocation densities, and (d) concentration of vacancies and/or vacancy agglomerates. While quantities (a) and (b) are important for all classes of ultra-fine grained materials, those of (c) and (d) particularly occur with nanomaterials processed by severe plastic deformation also being responsible for their specific features such as ductility and the presence of non-equilibrium phases.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Eötvös Loránd University Budapest

Journal

International Journal of Materials Research

Band

98

Seiten

290-298

Anzahl der Seiten

9

ISSN

1862-5282

DOI

https://doi.org/10.3139/146.101476

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/63e4b39a-c718-4c19-88ad-99cc30caf60d