Negative creep of single-crystals nickel-based superalloys

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Abstract

The negative creep of single crystals of nickel-based superalloys SR99 and CMSX-4 has been investigated. This phenomenon was observed for both superalloys at temperatures of 980–1000 °C and low or zero loading stresses. It is assumed that the main reason for the negative creep is the formation of a short-range order of atoms in a strongly alloyed crystal lattice of the g-matrix. Additional factors affecting the magnitude and anisotropy of the negative creep strain may be the relaxation of residual stresses: at the microscopic level, misfit stresses between the g-matrix and strengthening g′-precipitates, and at the mesoscopic level, dendritic stresses between the dendrite axes and interdendritic regions.

About the authors

A. I. Epishin

Merzhanov Institute of Structural Macrokinetics and Materials Science of the Russian Academy of Sciences

Author for correspondence.
Email: a.epishin2021@gmail.com
Russian Federation, Chernogolovka

D. S. Lisovenko

Merzhanov Institute of Structural Macrokinetics and Materials Science of the Russian Academy of Sciences

Email: a.epishin2021@gmail.com
Russian Federation, Chernogolovka

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