Precipitation hardening of superalloys by ordered γ′-particles

Nembach, E.; Neite, G.

doi:10.1016/0079-6425(85)90001-5

Cited by 347 publications

(100 citation statements)

References 108 publications

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“…Hence for superposition of solid solution and precipitate strengthening, q is expected to be close to unity. For a Ni-based superalloy, which, similar to Al-Li based alloys, contain L1 2 ordered precipitates, q ss&ppt has been found to equal 1.23 [4]. Other researchers [18,26,37] have used this value in successful analyses of strengthening in binary Al-Li alloys and we will adopt this value of q ss&ppt for the present Al-Li-Cu-Mg alloys.…”

Section: Superposition Of the Grain Strengthening Mechanismsmentioning

confidence: 99%

“…It is thought that q zone is approximately equal to the value of q for superposition of dissolved atoms and L1 2 ordered precipitates which equals 1.23 [4]. This superposition will yield…”

Section: Superposition Of the Grain Strengthening Mechanismsmentioning

confidence: 99%

“…[45,23,62]) the strengthening due to GPB zones received little attention in comparison to δ' strengthening. It is worth reiterating that the modelling of strengthening due to δ' has been validated in various works [3,4,15,16,26], whilst the strengthening due to GPB zones was validated in the previous section. Hence the present analysis of GPB and δ' strengthening and their relative importance in 8090 alloys is sound.…”

Section: Strengthening Of 8090 Type Alloys and Mmcsmentioning

confidence: 99%

“…More recent substantial contributions in this field are for instance those by Ardell [3] and Nembach and Neite [4]. In materials with added ceramic reinforcement, load transfer between matrix and reinforcement additionally strengthens the resulting composite.…”

Section: Introductionmentioning

confidence: 99%

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Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

et al. 1999

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A detailed quantitative model for the strengthening of monolithic alloys and composites due to precipitation strengthening, solution strengthening, grain and subgrain strengthening, strengthening by dislocations and load transfer to ceramic inclusions is presented. The model includes a newly derived description of the effect of a precipitate free zone (PFZ) around the reinforcing phase incorporating strain hardening of the PFZ. The model is successfully applied to model the experimental data for the proof strengths of four Al-Li-Cu-Mg type alloys and composites aged to obtain a wide range of microstructures and all strengthening contributions are quantified. It is shown that PFZ formation in the 8090 MMC causes a drastic reduction in the proof strength (about 100 MPa), but it has little influence on the time required for peak ageing. In all alloys strengthening due to GPB zones is more important than strengthening due to δ' (Al 3 Li) phase.

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Section: Superposition Of the Grain Strengthening Mechanismsmentioning

confidence: 99%

“…It is thought that q zone is approximately equal to the value of q for superposition of dissolved atoms and L1 2 ordered precipitates which equals 1.23 [4]. This superposition will yield…”

Section: Superposition Of the Grain Strengthening Mechanismsmentioning

confidence: 99%

Section: Strengthening Of 8090 Type Alloys and Mmcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

et al. 1999

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“…According to the chemical composition of ATI Allvac®718Plus TM , the most essential precipitates in this alloy are the D0 a -ordered δ (Ni 3 (Nb,Al)) and the L1 2 -ordered γ' (Ni 3 (Al,Ti,Nb)) phases. The precipitation of a suitable quantity and size of coarse δ precipitates is used for controlling grain growth [3,4], whereas the precipitation of a large amount of fine-dispersed coherent γ' precipitates provides strengthening by precipitation hardening [5,6]. Therefore, knowledge of the precipitation kinetics of both phases is of high technological interest in order to control the evolution of microstructure during processing and to achieve the desired material properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Simultaneous Precipitation of δ and γ Phases in the Ni-Base Superalloy ATI Allvac® 718Plus™

Sommitsch¹,

Kozeschnik²,

Zickler³

et al. 2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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The present work deals with the numerical simulation of the precipitation kinetics of δ (Ni 3 (Nb, Al)) and γ' (Ni 3 (Al, Ti, Nb)) phases in the commercial nickel-base superalloy ATI Allvac®718Plus TM . Important precipitate parameters such as volume fraction, mean radius and number density are numerically calculated as a function of the heat treatment parameters time and temperature and compared to experimentally determined data. To match the experimentally observed kinetics, the predicted interfacial energy of the precipitates, as calculated for a sharp, planar phase boundary, is adjusted to take into account the interfacial curvature and entropic effects of a diffuse interface. Using these modified interfacial energies, the calculated results show excellent agreement with the experimental measurements. Finally, a calculated time-temperature-precipitation (TTP) diagram for concurrent δ and γ' precipitation is presented, which clearly demonstrates strong kinetic interactions during simultaneous precipitation of these phases. Thus, the present study emphasizes the importance of carefully controlling the heat treatment parameters time and temperature during the production process of ATI Allvac®718Plus TM , in order to achieve the desired microstructure and hence mechanical properties.

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Processing of Nickel-Base Superalloys for Turbine Engine Disc Applications

Fecht¹,

Furrer²

2000

Adv. Eng. Mater.

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Precipitation hardening of superalloys by ordered γ′-particles

Cited by 347 publications

References 108 publications

Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

Numerical Simulation of the Simultaneous Precipitation of δ and γ Phases in the Ni-Base Superalloy ATI Allvac® 718Plus™

Processing of Nickel-Base Superalloys for Turbine Engine Disc Applications

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Precipitation hardening of superalloys by ordered γ′-particles

Cited by 347 publications

References 108 publications

Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: II. Modelling of yield strength

Numerical Simulation of the Simultaneous Precipitation of &delta; and &gamma; Phases in the Ni-Base Superalloy ATI Allvac&reg; 718Plus&trade;

Processing of Nickel-Base Superalloys for Turbine Engine Disc Applications

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Numerical Simulation of the Simultaneous Precipitation of δ and γ Phases in the Ni-Base Superalloy ATI Allvac® 718Plus™