Journal ArticleDOI
On the kinetics of rafting in CMSX-4 superalloy single crystals
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In this paper, the kinetics of γ′ rafting in single crystals at 950°C have been studied using scanning and transmission electron microscopies, and it is concluded that the threshold strain is a quantity suitable for distinguishing between rafting occurring in the “elastic� and “plastic” regimes.About:
This article is published in Acta Materialia.The article was published on 1999-05-28. It has received 217 citations till now.read more
Citations
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Journal ArticleDOI
Creep of CMSX-4 superalloy single crystals: effects of rafting at high temperature
TL;DR: In this paper, the creep performance of (001)-orientated superalloy single crystals at temperatures beyond 1000 C was analyzed and it was demonstrated that methods of interpretation which, assume a proportionality between the creep strain rate and creep strain, are unable to account for creep hardening which occurs as a consequence of rafting.
Journal ArticleDOI
A model for the creep deformation behaviour of nickel-based single crystal superalloys
TL;DR: In this article, a model for the creep deformation of single crystal superalloys is presented that is sensitive to chemical composition and microstructure, and the rate-controlling step is assumed to be climb of dislocations at the matrix/particle interfaces and their rate of escape from trapped configurations.
Journal ArticleDOI
Damage accumulation during creep deformation of a single crystal superalloy at 1150 °C
TL;DR: In this article, microstructural degradation in the CMSX-4 single crystal superalloy during creep deformation at 1150°C and 100MPa is studied. And it is shown that the high strain rates and shear stresses associated with the rupture process are sufficient to cause realignment of the rafted γ′ structure with respect to the γ matrix.
Journal ArticleDOI
Rafting in single crystal nickel-base superalloys - An overview
TL;DR: In this article, the effect of stress state on γ/γ′ rafting, kinetics and morphological evolution are discussed with the recent experimental results, and the nature and influence of rafting on creep properties including pre-rafted conditions are discussed.
Journal ArticleDOI
The effect of chromium and cobalt segregation at dislocations on nickel-based superalloys
Paraskevas Kontis,Zhuangming Li,David M. Collins,Jonathan Cormier,Dierk Raabe,Baptiste Gault +5 more
TL;DR: In this paper, the segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied, showing that pipe diffusion initiates the undesirable dissolution of γ' precipitates.
References
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Journal ArticleDOI
Directional coarsening in nickel-base single crystals with high volume fractions of coherent precipitates
Tresa M. Pollock,A.S. Argon +1 more
TL;DR: In this article, the diffusional processes responsible for rafting were investigated on the local scale of the precipitates, with preferential local dissolution of the γ′ and diffusional flow of alloying elements around the periphery of precipitates.
Journal ArticleDOI
Rafting in superalloys
TL;DR: In this article, it was shown that in the elastic regime, the thermodynamic driving force for rafting is proportional to the applied stress, to the difference between the lattice parameters of the γ matrix and the particles, and the difference of their elastic constants.
Journal ArticleDOI
The effect of uniaxial stress on the periodic morphology of coherent gamma prime precipitates in nickel-base superalloy crystals
J. K. Tien,Stephen M. Copley +1 more
TL;DR: In this article, the periodic morphology of cube-shaped, coherent Ni3(Al, Ti) superalloy was found to be influenced by the application of a 〈100〉 oriented uniaxial stress during annealing at elevated temperature.
Journal ArticleDOI
Influence of uniaxial stress on the morphology of coherent precipitates during coarsening—elastic energy considerations
TL;DR: In this article, the influence of uniaxial applied stress on the morphology of coherent precipitates during coarsening is investigated, using the theory of inclusions and inhomogeneities by Eshelby.
Journal ArticleDOI
Numerical determination of the elastic driving force for directional coarsening in Ni-superalloys
Simona Socrate,David M. Parks +1 more
TL;DR: In this paper, the generalized force acting on a material interface which is work-conjugate with the normal displacement of the interface itself has been evaluated for Ni-superalloys.