Calculation of coherency elastic strain for different morphologies of the γ΄ precipitates in a Nickel-base superalloy

Journal of Advanced Materials in Engineering

卷:31

A. Samadi¹  M. Khalili Savadkoohi¹ 

[1] Advanced Materials Research Center, Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran.;

关键词: nickel-base superalloy;    coherency;    constrained misfit;    unconstrained misfit;    elastic strain;    morphology;    x-ray diffraction.;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown