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Article Dans Une Revue Acta Materialia Année : 2018

Tensorial nature of γ ′ -rafting evolution in nickel-based single crystal superalloys

Résumé

Our work aims at providing a tensorial analysis of directionalg0rafting state in a nickel based singlecrystal superalloy, for several orientations. According to a visco-plasticity modeling accounting formicrostructure evolution during creep (including rafting), differentdevendorder fabric tensor repre-sentations are provided, respectively forgchannel width, primaryg0cuboidal particles and micro-structure periodicityl. Several image processing algorithms are presented and used to best measurethese quantities, particularly the AutoCorrelation Method (ACM) and the Rotational Intercept Method(RIM). Each method is developed for a specific purpose: the AutoCorrelation Method yields informationabout principal directions and pattern periodicity, while RIM method provides a polar distribution of aphysical quantity. A methodology is proposed and applied to measure the Rose diagrams and the cor-responding fabric tensors of order 2, 4, 6 and 8, starting by the bestfitting Fourier series coefficients ofthe experimental data. When RIM method is possible to apply, fabric tensors up to order 8 are consid-ered. In any case a 2ndordertensor representation of single crystalsg0rafting state is provided.
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Dates et versions

hal-02318803 , version 1 (17-10-2019)

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V. Caccuri, R. Desmorat, J. Cormier. Tensorial nature of γ ′ -rafting evolution in nickel-based single crystal superalloys. Acta Materialia, 2018, 158, pp.138-154. ⟨10.1016/j.actamat.2018.07.033⟩. ⟨hal-02318803⟩
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