Contributions from elastic inhomogeneity and from plasticity to γ′ rafting in single-crystal Ni–Al

Effect of Ni4Ti3 precipitation on martensitic transformation in Ti–Ni

“…This choice may influence the final equilibrium shape and the stress field created by the precipitate. A phase field method has already been developed for microstructural evolution in elastically inhomogeneous systems [30][31][32] and, more importantly, elastic constants of the Ni 4 Ti 3 metastable phase have been obtained by ab initio calculations and experiments [20,21,33], a parallel comparison could be made to quantify the contribution from the modulus inhomogeneity. That work will be presented elsewhere.…”

Prediction of Mechanical Behaviour in Ni-Base Superalloys Using the Phase Field Model of Dislocations

“…The Phase Field Model has proved a powerful tool for studying the deformation mechanisms in L1 2 ordered superalloys on the scale of the dislocation interactions with precipitates [1,2]. The method has also been successfully applied to modelling γ' precipitate shearing by dislocations on the {111} plane [3] in single crystal superalloys and to study the role of channel plasticity during rafting [4,5] at higher temperatures and lower stresses (> 1000°C and < 200 MPa). However, the model, described in [3], had limited applicability to simulating γ' cutting at elevated temperatures, because it did not incorporate the formation of extrinsic stacking faults.…”

Mechanisms of High Temperature/Low Stress Creep of Ni-Based Superalloy Single Crystals

“…The NASAIR alloy is a "first-generation" alloy while Rene N5 is a compositionally more complex, "third generation" alloy. In spite of exhaustive mechanical testing of these alloys, little or no substructure analysis is Although not a new technique [5][6] it has not been widely utilized for deformation substructure analysis. However, we have found it to be particularly useful for examining dislocation structures in fine-grained polycrystalline materials, and for obtaining large fields of view for assaying deformation mechanisms and dislocation density measurements over relatively large specimen regions.…”