Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 3: Topical Session Bulk Nanostrucured Materials I - Processing
MM 3.4: Vortrag
Montag, 26. März 2012, 11:15–11:30, H 0107
Comparison of the saturation structures of intermetallic alloys subjected to severe plastic deformation — •Christian Rentenberger, Christoph Gammer, David Geist, and Hans-Peter Karnthaler — University of Vienna, Physics of Nanostructured Materials, Boltzmanngasse 5, 1090 Wien, Austria.
Microstructural refinement by severe plastic deformation is a method to achieve novel mechanical properties. Considerable attention has been devoted to pure metals and solid solution alloys but only a few studies have been carried out on intermetallic alloys. The main reason is their high brittleness making them difficult to deform. In the present work based on transmission electron microscopy (TEM) investigations the saturation structures yielded by high pressure torsion deformation of different intermetallic compounds are compared: Ni3Al (L12 ordered), Zr3Al (L12 ordered) and FeAl (B2 ordered). The structures are studied in three dimensions by using both different sections and novel TEM methods [1]. It is concluded that depending on the type of lattice defects induced by deformation different saturation structures are occurring: a nanocrystalline structure showing the loss of chemical long-range order or an amorphous one with residual nanograins [2,3].
[1] C. Gammer, C. Mangler, H. P. Karnthaler, C. Rentenberger. Micr. Microanal. 17, 866 (2011). [2] C. Mangler, C. Gammer, H. P. Karnthaler, C. Rentenberger, Acta Mater. 58, 5631 (2010). [3] D. Geist, C. Gammer, C. Mangler, C. Rentenberger, H. P. Karnthaler. Phil. Mag. 90, 4635 (2010). This work was supported by the Austrian Science Fund (FWF): [S10403, P22440].