Deformation mechanisms in a Co-rich nickel based superalloy with different size of γ׳ precipitates

Fu, B.D.; Du, Kui; Han, Guohao; Cui, Chuanyong; Zhang, J.X.

doi:10.1016/j.matlet.2015.03.142

Cited by 64 publications

(13 citation statements)

References 18 publications

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“…It is clear from Figures that a large number of ESFs are created in the experimental alloy after tensile straining at RT. These observations are somewhat surprising with respect to previous studies (Viswanathan et al ., ; Kovarik et al ., ; Unocic et al ., ; Fu et al ., ; Tian et al ., ), where it has been widely reported that the formation process of these faults is thermally activated and requires local diffusion or atomic rearrangement. Many researchers (Sinharoy et al ., ; Viswanathan et al ., ; Raujol et al ., ; Kovarik et al ., ; Unocic et al ., ) pointed out that their formation is most likely due to the presence of tertiary γ′ precipitates in the γ matrix channels.…”

Section: Resultsmentioning

confidence: 99%

“…The formation mechanisms of isolated superlattice stacking faults and extended stacking faults (ESFs) in Ni‐base superalloys have also been widely investigated (Courbon et al ., ; Kakehi, ; Sinharoy et al ., ; Zhang et al ., ; Décamps et al ., ; Viswanathan et al ., ; Raujol et al ., ; Kovarik et al., ; Unocic et al ., ; Fu et al ., ; Tian et al ., ). Décamps et al .…”

Section: Introductionmentioning

confidence: 99%

“…The formation mechanisms of isolated superlattice stacking faults and extended stacking faults (ESFs) in Ni-base superalloys have also been widely investigated (Courbon et al, 1991;Kakehi, 1999;Sinharoy et al, 2001;Zhang et al, 2001;Décamps et al, 2004;Viswanathan et al, 2005;Raujol et al, 2006;Kovarik et al, 2009;Unocic et al, 2011;Fu et al, 2015;. Décamps et al (2004) proposed a mechanism of shearing of both γ and γ phases by a single a/6<112> dislocation involving the nucleation of a second Shockley partial dislocation to form the ESF.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plastic deformation mechanisms in a new Ni‐base single crystal superalloy at room temperature

Zhang

Yuan

Zuo-ning

et al. 2017

Journal of Microscopy

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The evolution of dislocation configurations in a new Ni-base single crystal superalloy, M4706, during tensile deformation at room temperature is characterised by transmission electron microscopy. Experimental results show that contrary to previous reports, numerous isolated superlattice stacking faults and extended stacking faults are formed in the slightly deformed specimens with and without tertiary γ' precipitates. Meanwhile, it is also found that as the plastic deformation proceeds, the dominant deformation mechanism changes from stacking fault shearing to antiphase boundary shearing. Finally, based on experimental observations, the reasons for the formation of these faults and the transition in the deformation mechanism are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plastic deformation mechanisms in a new Ni‐base single crystal superalloy at room temperature

Zhang

Yuan

Zuo-ning

et al. 2017

Journal of Microscopy

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“…Hence, the slip of the sub close-packed lattice plane tends to occur at high temperature. Various dislocation movement mechanisms were proposed to describe the deformation behavior of superalloy, such as antiphase boundary (APB) shearing, stacking fault (SF) shearing and Orowan bypassing [ 29 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Wang

Xiao-nan³

et al. 2018

Materials

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The recrystallization (RX) behavior of superalloy during standard solution heat treatment (SSHT) varies significantly with deformation temperature. Single-crystal (SX) samples of Ni-base superalloy were compressed to 5% plastic deformation at room temperature (RT) and 980 °C, and the deformed samples were then subjected to SSHT process which consists of 1290 °C/1 h, 1300 °C/2 h, and 1315 °C/4 h, air cooling. RT-deformed samples showed almost no RX grains until the annealing temperature was elevated to 1315 °C, while 980 °C-deformed samples showed a large number of RX grains in the initial stage of SSHT. It is inferred that the strengthening effect of γ’ phases and the stacking faults in them increase the driving force of RX for 980 °C-deformed samples. The RX grains nucleate and grow in dendritic arms preferentially when the microstructural inhomogeneity is not completely eliminated by SSHT. A model coupling crystal plasticity finite element method (CPFEM) and cellular automaton (CA) method was proposed to simulate the RX evolution during SSHT. One ({111} <110>) and three ({111} <110>, {100} <110>, {111} <112>) slip modes were assumed to be activated at RT and 980 °C in CPFEM calculations, respectively. The simulation takes the inhomogeneous as-cast dendritic microstructure into consideration. The simulated RX morphology and density conform well to experimental results.

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“…9 As an alloy strengthened mainly by c9 precipitates, the mechanical properties and deformation behaviors are all sensitively affected by the characteristics of c9 precipitates. [10][11][12][13] Service induced c9 degeneration in superalloys mainly occurs in the forms of c9 coarsening, the instability of c9 morphology, the dissolution of c9 precipitates, and the transformation from c9 to g etc. [14][15][16][17] These changes exert important influence on the mechanical properties of the alloys.…”

Section: Introductionmentioning

confidence: 99%

Gamma prime stability and its influence on tensile behavior of a wrought superalloy with different Fe contents

2016

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Gamma prime (c9) stability and its influence on tensile behavior of a newly developed wrought superalloy with various Fe contents was studied both experimentally and thermodynamically. The results show that the c9-solvus temperature is higher and c-c9 lattice mismatch is bigger in the alloy with the lower Fe content. During long-term thermal exposure at 650-750°C, the coarsening behavior of c9 precipitates follows Ostwald ripening kinetics and the lower Fe content can decrease the coarsening rate of c9 precipitates due to the increase of the activation energy for c9 coarsening. Moreover, the lower Fe content can retard the transformation from c9 to g phase. The tensile properties of the alloys with different Fe contents are almost same after standard heat treatment. However, after thermal exposure, the decrease of tensile strength in the alloy with lower Fe content is less than that of the alloys with higher Fe content due to the improvement of c9 stability.

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Deformation mechanisms in a Co-rich nickel based superalloy with different size of γ׳ precipitates

Cited by 64 publications

References 18 publications

Plastic deformation mechanisms in a new Ni‐base single crystal superalloy at room temperature

Plastic deformation mechanisms in a new Ni‐base single crystal superalloy at room temperature

Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Gamma prime stability and its influence on tensile behavior of a wrought superalloy with different Fe contents

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