Temperature dependence of γ-γ' lattice mismatch in Nickel-base superalloys

Nathal, M. V.; MacKay, Rebecca A.; Garlick, R. G.

doi:10.1016/0025-5416(85)90189-2

Cited by 177 publications

(54 citation statements)

References 25 publications

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“…Increased alloying with Re and W has resulted in superalloys with a negative -' lattice misfit, due to the strong partitioning behavior of these elements to the phase [7]. There has been much discussion in the literature regarding the relationship between the -' lattice misfit and the creep resistance of superalloys [8][9][10][11]. Though superalloys with a more negative misfit have generally been observed to be more creep resistant, a balance of properties, including solid solution strengthening of the matrix and strength of the ' are also important [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

Rowland¹,

Feng²,

Pollock³

2004

Superalloys 2004 (Tenth International Symposium)

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Nickel-base single crystal superalloys with Ru additions of 5.7 to 9.7 wt%, moderate amounts of refractory elements and up to 6.7 wt% Cr were investigated. The ' precipitate morphology of the experimental alloys was cuboidal, near-spherical and intermediately-shaped depending on the Cr and Ru content. The time to 1% creep and the creep rupture lives of the experimental alloys were measured at 950°C and 290 MPa. Within the set of alloys investigated rafting occurred parallel to the axis of the applied uniaxial tensile stress, perpendicular to the applied stress or was completely suppressed, suggesting a wide range of lattice misfit. Interfacial dislocation network development during creep also varied widely among the alloys investigated. The possibilities for control of microstructure and high temperature properties via Ru additions are discussed.

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Section: Introductionmentioning

confidence: 99%

Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

Rowland¹,

Feng²,

Pollock³

2004

Superalloys 2004 (Tenth International Symposium)

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“…The agreement is satisfactory. Using high temperature X-ray diffraction Nathal et al [27] determined the γ/γ' lattice mismatch of Ni-base superalloys from room temperature up to 1000 ºC. The measured temperature dependence of lattice parameters in commercial NASAIR 100 superalloy is compared in Figure 11 with the predictions according to TCNI6.…”

Section: Examples Of Calculation and Simulationmentioning

confidence: 99%

The Development and Validation of a New Thermodynamic Database for Ni-based Alloys ................................... 803

Bratberg¹,

Mao²,

Kjellqvist³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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Thermodynamic databases developed using the CALPHAD method has been successfully applied to the modeling and simulation of Ni based superalloys for more than fifteen years. Such databases when combined with suitable software, such as Thermo-Calc, can be used for accelerating alloy design as well as improving understanding of existing alloys in terms of their processing and in-service behavior. Additionally, such databases are also essential to the modeling of microstructural evolution using methods such as phase field or mean field approaches.A new thermodynamic database, TCNI6, has been developed for Ni-based superalloys based on the critical evaluation, using the CALPHAD method, of all the constituent binary systems across their full range of composition and many of the ternary systems containing Ni, as well as a number of other key ternary systems. The database has also been validated where possible against higher order systems as well.Together with the new mobility database, MOBNI3, which contains descriptions for the atomic mobility for respectively the γ (A1), γ' (L1 2 ), α (A2), β (B2) and liquid phases, TCNI6 can be used with software such as DICTRA to predict different kinetic aspects taking all relevant phases into account, e.g. the simulation of interdiffusion across Ni-based coatings.A new user friendly computational tool, TC-PRISMA, which simulates the kinetics of precipitation processes, is demonstrated utilizing these new databases and combined with interface property data. Engineering applications of precipitation modelling are validated against experimental data.

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“…The s i g n o f 6 determines t h e o r i e n t a t i o n o f t h e r a f t e d s t r u c t u r e w i t h respect t o t h e a p p l i e d s t r e s s (18,25,26). Although e l a s t i c modulus mismatch has a l s o been shown t o be i m p o r t a n t (s, 27), i t has been demonstrated t h a t s u p e r a l l o y s w i t h n e g a t i v e and p o s i t i v e values of l a t t i c e mismatch form r a f t s p e r p e n d i c u l a r and p a r a l l e l , r e s p e c t i v e l y , t o t h e a p p l i e d t e n s i l e a x i s .…”

Section: R E C I P I T a T E I S Another F A C T O R Which Can I N F mentioning

confidence: 99%

“…i n c r e a s i n g t h e Co content i n NASAIR 100 d e r i v a t i v e s has been shown t o decrease t h e magnitude o f t h e l a t t i c e mismatch (25,35). decrease i n t h e magnitude o f mismatch accompanies t h e i n c r e a s e i n Co l e v e l i n t h e MXON a l l o y s e r i e s , which i n t u r n may be a t l e a s t p a r t i a l l y r e s p o n s i b l e f o r …”

Section: (37)mentioning

confidence: 99%

Microstructure-Property Relationships in Directionally Solidified Single-Crystal Nickel-Base Superalloys

MacKay

Nathal

1988

MiCon 86: Optimization of Processing, Properties, and Service Performance Through Microstructural Control

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This paper discusses some of the microstructural features which influence the creep properties of directionally solidified and single-crystal nickel-base superalloys. Gamma prime precipitate size and morphology, γ-γ' lattice mismatch, phase instability, alloy composition, and processing variations are among the factors considered. Recent experimental results are reviewed and related to the operative deformation mechanisms and to the corresponding mechanical properties. Special emphasis is placed on the creep behavior of single-crystal superalloys at high temperatures, where directional γ' coarsening is prominent, and at lower temperatures, where γ' coarsening rates are significantly reduced. It can be seen that very subtle changes in microstructural features can have profound effects on the subsequent properties of these materials.

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Temperature dependence of γ-γ' lattice mismatch in Nickel-base superalloys

Cited by 177 publications

References 25 publications

Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

Microstructural Stability and Creep of Ru-Containing Nickel-Base Superalloys

The Development and Validation of a New Thermodynamic Database for Ni-based Alloys ................................... 803

Microstructure-Property Relationships in Directionally Solidified Single-Crystal Nickel-Base Superalloys

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