Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session Bulk Nanostrucured Materials V - Microstructure and Characterization III
MM 23.4: Vortrag
Dienstag, 27. März 2012, 12:15–12:30, H 0107
Elemental distribution and solid solubility of nanocrystalline near-equilibrium Fe and Cu alloys — •Thomas Riedl1, Alexander Kirchner1, Konrad Eymann1, Ralf Schlesiger2, Ahmed Shariq3, and Bernd Kieback1 — 1Institut für Werkstoffwissenschaft, TU Dresden, 01062 Dresden, Germany — 2Institut für Materialphysik, Univ. Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 3Fraunhofer-Center für Nanoelektronische Technologien, Königsbrücker Str. 180, 01099 Dresden, Germany
Nanocrystalline (nc) alloys exhibit a large volume fraction crystallite interface regions, notably grain boundaries (GBs) [1]. Owing to the reduced atom density GBs can offer favourable sites for solute atoms. In the present work we investigate the solid solubility of nc near-equilibrium bcc Fe and fcc Cu matrices for conventionally immiscible solutes. As preparation route the mechanical alloying technique followed by annealing was selected. Atom probe tomography analyses show that Mg and C solute atoms are enriched in the GBs of 12nm grain sized Fe. From that, segregation strengths and solute interaction parameters are derived. Complementary to the experimental study thermodynamic calculations of solid solubilities have been performed [2,3].
[1] H. Gleiter: Prog. Mater. Sci. 33 (1989) 223
[2] A. Kirchner and B. Kieback: Scr. Mater. 64 (2011) 406
[3] Financial support by the Deutsche Forschungsgemeinschaft via the Emmy-Noether program is appreciated.