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Characterizing precipitation defects in nickel based 718 alloy

Niang, Aliou and Huez, Julitte and Lacaze, Jacques and Viguier, Bernard Characterizing precipitation defects in nickel based 718 alloy. (2010) Materials Science Forum, vol. 636-637 . pp. 517-522. ISSN 0255-5476

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.636-637.517

Abstract

In the present study we examine the crystallographic structure of the ϒ, ϒ'' and δ phases present in nickel base 718 alloy. The chemical ordering of Nb atoms and possible planar faults that may be observed in ϒ'' precipitates are detailed. High resolution transmission electron microscopy (HRTEM) observations of various faults are reported. The decomposition of a matrix dislocation to form a locked V shaped configuration is shown. The observation along [110] type direction allows to identify the type of defect, which is observed as a pure geometric stacking fault.

Item Type:Article
Additional Information:Thanks to Materials Science Forum editor. The definitive version is available at http://www.scientific.net/ The original PDF of the article can be found at Materials Science Forum website : http://www.scientific.net/MSF.636-637.517
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Nihad Lahdifi
Deposited On:25 Feb 2011 11:59

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