Volume 31, Issue 2 (Dec 2012)
2012, 31(2): 79-87 |
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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 . Journal of Advanced Materials in Engineering (Esteghlal) 2012; 31 (2) :79-87
URL: http://jame.iut.ac.ir/article-1-545-en.html
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. , m_kh_savadkoohi@yahoo.com
Abstract: (6486 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.
Keywords: Nickel-base superalloy, Coherency, Constrained misfit, Unconstrained misfit, Elastic strain, Morphology, X-ray diffraction.
Type of Study: Research |
Subject:
General
Received: 2015/02/9 | Accepted: 2015/05/6 | Published: 2015/05/6
Received: 2015/02/9 | Accepted: 2015/05/6 | Published: 2015/05/6
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