Ab-initio study of Re and Ru effect on stability of TCP nanoparticles in Ni-based superalloys
Abstract
Modern nickel-based superalloys contain high concentrations of rhenium that allows the improvement of their creep strength. The high levels of rhenium, however, results in the formation of topologically close-packed phases (TCP) which have a negative influence on its properties. The addition of ruthenium was found to reduce the precipitation of nano-sized TCP phases, but the reasons have not been established. In this paper, by using an ab-initio approach, we studied the effect of rhenium and ruthenium on the structural properties of Ni matrix as well as the TCP phases. We demonstrate that Cr, Mo and W are the most effective additions to provoke the formation of TCP phases, whereas ruthenium has a destabilizing effect.
Supporting agencies: This work was supported by Research Program of Ural Branch of the RAS, Grant No. 12-U-3-1007.
About the Authors
N. I. Medvedeva
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
Ekaterinburg
A. L. Ivanovskii
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
Ekaterinburg
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Review
For citations:
Medvedeva N.I., Ivanovskii A.L. Ab-initio study of Re and Ru effect on stability of TCP nanoparticles in Ni-based superalloys. Nanosystems: Physics, Chemistry, Mathematics. 2014;5(4):486-493.
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