Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.76: Poster

Monday, March 11, 2013, 18:00–20:00, Poster E

Study of Solid Solution Strengthening of Nickel by transition metal solutes using Diffusion couples and Nanoindentation — •Hamad ur Rehman, Mathias Göken, and Karsten Durst — Institute of General Materials Properties, Department of Material Science, FAU erlangen-Nürnberg

Diffusion couples are often used for the determination of phase diagrams. In the present work, nanoindentation was used on diffusion couples to measure solid solution strengthening in Nickel based alloys. By combining Nanoindentation with the chemical composition, measured by EDX a very high spatial resolution is achieved in the Interdiffusion zone. It was applied to the development of Nickel based super alloys, which have more than 15 alloying elements. While some of these are gamma prime formers, others act as solid solution strengtheners for the matrix. Therefore, it is important to understand the contribution of these alloying elements on solid solution strengthening. Ni-NiX (X = Ta, W, Re, Ir and Pt) diffusion couples were used to study the influence of transition metal elements on solid solution hardening (SSH) of Nickel. The SSH was evaluated using Labusch theory. It was found that the solid solution hardening coefficient is dependent on the size of the solute elements and their atomic number. These results show that the solid solution strengthening depends on the atomic radius and the corresponding electronic structure of the solute elements. This combinatory approach allows us to determine the SSH coefficients as a function of the composition of the solid solution hardening element.