Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 23: Topical Session Bulk Nanostrucured Materials V - Microstructure and Characterization III

MM 23.4: Talk

Tuesday, March 27, 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.