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Nanoindentation investigations to study solid solution hardening in Ni-based diffusion couples

Published online by Cambridge University Press:  31 January 2011

Oliver Franke ,
Karsten Durst  and
Mathias Göken
Oliver Franke
Affiliation:
Department for Materials Science, Institute I, General Materials Properties, University Erlangen-Nürnberg, Erlangen D-91508, Germany
Karsten Durst*
Affiliation:
Department for Materials Science, Institute I, General Materials Properties, University Erlangen-Nürnberg, Erlangen D-91508, Germany
Mathias Göken
Affiliation:
Department for Materials Science, Institute I, General Materials Properties, University Erlangen-Nürnberg, Erlangen D-91508, Germany
*
a) Address all correspondence to this author. e-mail: karsten.durst@ww.uni-erlangen.de
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Abstract

In this work the hardening effect of Ta and Mo in Ni-base alloys was investigated using a combinatorial approach with diffusion couples. Furthermore, the Ni-Fe system was used as a reference system taking advantage of the full miscibility at high temperatures. Ta was chosen, as aside from having a technical relevance in the Ni-base superalloys, it also has a high miscibility in Ni. The main focus of this paper will be solid solution hardening. It will be shown that even though the determination of hardness is subject to varying indentation size effects (ISE) [Durst et al., Acta Mater.55(20), 6825 (2007)], only a few modifications are necessary to describe solid solution strengthening measured by nanoindentations using the Labusch theory [Labusch, Acta Metall.20(7), 917 (1972)]. Moreover, after a careful evaluation of the results, the data can be used to investigate solid solution hardening effects quickly and efficiently with small amounts of material.

Keywords

DiffusionNanoindentationScanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 1127 - 1134
Copyright
Copyright © Materials Research Society 2009

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