Dresden 2009 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 42: Nanostructured Materials III
MM 42.7: Talk
Thursday, March 26, 2009, 15:30–15:45, IFW A
Mechanical alloying of Fe-Cu powders: elaborating the microstructure at various scales — •Catharina Wille1, Taláat Al-Kassab1,2, Pyuck-Pa Choi3, and Reiner Kirchheim1 — 1Institut für Materialphysik, Universität Göttingen, Germany — 2Material Science and Engineering, King Abdullah University of Science and Technology (KAUST), effective 15 April 2009 — 3Korea Institute of Science and Technology, Nano-Materials Research Center
In this contribution, the process of mechanical alloying has been studied for both sides of the binary Fe-Cu system. Ranging from light-optical microscopy on the mm-scale to atom probe tomography (APT) on the Ångstrøm-scale, the morphology could be observed on several orders of magnitude. Since a ductile element (Cu, fcc) and a brittle one (Fe, bcc) were combined, striking differences in morphology were expected and found on all length-scales, depending on the mixing ratio. Results on powders with low concentrations of the respective minority component will be presented and discussed.
Regarding the widespread application and accessibility, Fe-Cu acts as an ideal binary model alloy to elaborate the enforced non-equilibrium enhanced solubility being immiscible and characterised by a large positive heat of mixing. Chemical identification on the Ångstrøm-scale was granted by APT. Thus, not only the atomic mixing of Fe and Cu could be evaluated, but also the distribution of impurities, mostly stemming from the fabrication procedure.
Financial support from the DFG under contract KI-230/33-1 is gratefully acknowledged.