M. Khalili Savadkoohi, A. Samadi,
Volume 31, Issue 2 (12-2012)
Abstract
Coherency elastic strain between γ and is one of the effective factors which affect the morphology, spatial re-arrangement and coarsening kinetics of precipitates in nickel-base superalloys. In this investigation, using X-ray diffraction (XRD) technique, the - constrained and unconstrained lattice misfits were calculated for different morphologies of the precipitates in Inconel 738LC nickel-base superalloy. The constrained and unconstrained misfits, hence the coherency elastic strains of different morphologies of the precipitates were calculated from the XRD patterns of the bulk sample and electrolytically extracted precipitates, respectively. According to the results, as the sizes of the particles increased the - coherency as well as the compressive strain of the precipitates was reduced and consequently their morphology changed from spherical to cubic, then flower-like, and finally dendritic shapes.
