Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 36: Nanomaterials I: Excess Volume and Confinement
MM 36.2: Vortrag
Mittwoch, 18. März 2015, 12:00–12:15, H 0107
Defects and structural anisotropy of HPT- and ECAP-deformed Ni studied by difference dilatometry — •Jaromir Kotzurek1, Anton Hohenwarter2, Simon Trubel3, Christian Neubauer1, Sergiy Divinski3, Wolfgang Sprengel1, Gerhard Wilde3, Reinhard Pippan4, and Roland Würschum1 — 1Institute of Materials Physics, Graz University of Technology — 2Department of Materials Physics, University of Leoben — 3Institute of Materials Physics, University of Münster — 4Erich Schmid Institute of Materials Science, Austrian Academy of Sciences Leoben
Difference dilatometry is used to study the excess volume associated with defects which are induced by high-pressure torsion (HPT) and equal-channel angular pressing (ECAP). Based on our recent studies of grain-boundary excess free volume in HPT-deformed Ni [1], issues of structural anisotropy and method of deformation are in the focus of the present studies. Both HPT- and ECAP-deformed nickel show an anisotropic defect annealing behavior prior to the onset of recrystallization, which can be associated with an anisotropic grain shape caused by the deformation. Anisotropic length change is also found after uniaxial post-deformation of HPT-Ni, indicating that the anisotropy is not caused by residual stresses. Financial support by the FWF Austrian Science Fund is appreciated (project P25628-N20).
[1] E.-M. Steyskal et al, Phys.Rev.Lett., 108 (2012) 055504