Volume 31, Number 2 (Dec 2012)                   jame 2012, 31(2): 79-87 | Back to browse issues page

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M. Khalili Savadkoohi, A. Samadi. Calculation of coherency elastic strain for different morphologies of the γ΄ precipitates in a Nickel-base superalloy . jame. 2012; 31 (2) :79-87
URL: http://jame.iut.ac.ir/article-1-545-en.html

Advanced Materials Research Center, Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran.
Abstract:   (1129 Views)
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.
Full-Text [PDF 511 kb]   (356 Downloads)    
Type of Study: Research | Subject: General
Received: 2015/02/9 | Accepted: 2015/05/6 | Published: 2015/05/6

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