Direct Experimental Determination of Grain Boundary Excess Volume in Metals

Autor(en)

Eva-Maria Steyskal, Bernd Oberdorfer, Wolfgang Sprengel, Michael Zehetbauer, Reinhard Pippan, Roland Würschum

Abstrakt

The grain boundary excess volume, i.e., the grain boundary expansion, e(GB), was experimentally determined for high-angle grain boundaries in nickel using the direct technique of high-precision difference dilatometry. Values of e(GB) = (0.35 +/- 0.04) x 10(-10) m and e(GB) (0.32 +/- 0.04) x 10(-10) m were obtained by measuring the removal of grain boundary volume upon grain growth for two different types of ultrafine-grained samples. The results are discussed in comparison to values obtained so far from indirect techniques and from computer simulations. It demonstrates the strength of the presented novel, direct approach for grain boundary expansion measurements.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Technische Universität Graz, Österreichische Akademie der Wissenschaften (ÖAW)

Journal

Physical Review Letters

Band

108

Anzahl der Seiten

5

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.108.055504

Publikationsdatum

2012

Peer-reviewed

Ja

ÖFOS 2012

210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/e0f833ac-c994-43fa-b12e-9c4f63e01eec