The effect of strain rate on the flow stress and dislocation behavior of a precipitation-hardened nickel-base alloy

Leverant, G. R.; Gell, Maurice; Hopkins, Sharla

doi:10.1016/0025-5416(71)90050-4

Cited by 69 publications

(13 citation statements)

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“…A large reduction in tensile flow stress of Mar-M200 at 760°C and 3 9 10 -7 s -1 was attributed to shearing of c¢ precipitates by a/3 112 h i partials through creation of low-energy stacking faults in addition to shearing by a/2 110 h idislocations creating antiphase boundaries. [34] The drop in flow stress at lower strain rates in the present case is also likely for a similar reason. Additional TEM work is required to ascertain the nature of dislocations and stacking faults in alloy 720Li.…”

Section: Yield Strengthmentioning

confidence: 73%

“…Both the specimens strained at 10 -5 and 10 -2 s -1 at 750°C revealed the presence of stacking faults within secondary c¢ particles, as shown in Figure 8. Both the shearing processes, first involving formation of antiphase boundaries and, second, involving superlattice stacking faults, especially at elevated temperatures, have been observed in a few other nickelbase superalloys [34][35][36][37][38] containing a high volume fraction of strengthening precipitates. A large reduction in tensile flow stress of Mar-M200 at 760°C and 3 9 10 -7 s -1 was attributed to shearing of c¢ precipitates by a/3 112 h i partials through creation of low-energy stacking faults in addition to shearing by a/2 110 h idislocations creating antiphase boundaries.…”

Section: Yield Strengthmentioning

confidence: 96%

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Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Gopinath

Gogia

Kamat

et al. 2008

Metall Mater Trans A

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Tensile properties, deformation, and fracture behavior of a wrought nickel-base superalloy 720Li have been studied in standard solutionized and two-stage-aged condition in the temperature range of 25°C to 750°C. Effect of strain rate on tensile behavior was assessed at 25°C, 400°C, and 750°C at five strain rates that range between 10 -5 s -1 and 10 -1 s -1 . The yield strength and ultimate tensile strength of the alloy remained unaffected by temperature until about 600°C and 500°C, respectively, typical of superalloys strengthened by fine and coherent intermetallic Ni 3 Al-based precipitates. The flow stress of the alloy was found to be insensitive to the strain rates studied at 25°C and 400°C. However, at 750°C, the flow stresses showed strain rate sensitivity at strain rates <10 -3 s -1 . The strain hardening behavior at 25°C and 400°C were similar. At 750°C, stain hardening was observed only at strain rates >10 -3 s -1 , and at lower strain rates, tensile instability was seen to set in immediately after yielding. The alloy exhibited ductile dimple fracture at all the temperatures and strain rates studied. Microstructural investigations indicate that in regimes where flow stresses are insensitive to strain rate, deformation occurs through heterogeneous planar slip, whereas in strain rate sensitive regimes, thermally activated diffusion processes promote homogeneous deformation.

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Section: Yield Strengthmentioning

confidence: 73%

Section: Yield Strengthmentioning

confidence: 96%

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Gopinath

Gogia

Kamat

et al. 2008

Metall Mater Trans A

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“…Materials in which flow is controlled by dislocation mobility are generally acknowledge to be very strain rate sensitive and are usually characterized by a large strain rate exponent (m) and a low stress exponent (n). However, the effect of strain rate on the flow stress of Ni 3 A1 as measured in constant strain rate experiments has been shown to be negligible [12]. In order to determine if dislocation mobility plays an important role in determining the flow stress, stress relaxation experiments have been conducted to measure the effects of stress and strain rate on the flow properties of Ni 3 AL.…”

Section: Deformation Transient Experimentsmentioning

confidence: 99%

High Temperature Deformation Processes and Strengthening Mechanisms in Intermetallic Particulate Composites

Nix¹

1991

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“…behaviour of such alloys. Apart from the effect of crystallographic orientation which is out of the scope of the present study and obviously apart from the effect of temperature, the γ' precipitate size [8][9][10] and morphology [12,13] and the strain rate [14][15][16] have been reported to influence the YS behaviour of this class of materials, whereas the effect of alloy composition has been only scarcely discussed.…”

Section: Resultsmentioning

confidence: 99%

Influence of Chemistry on the Tensile Yield Strength of Nickel-Based Single Crystal Superalloys

Caron¹,

Diogolent²,

Drawin³

2011

AMR

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Abstract. The tensile yield strength of AM1 and MC-NG single crystal superalloys with a γ' precipitate size close to 300 nm were compared within the 20-1050°C temperature range. The room temperature yield strength of the fourth generation MC-NG superalloy is about 200 MPa less than that of the AM1 first generation one. Inversely, at higher temperatures (T > 800°C), the tensile strength of MC-NG is higher than that of AM1. These results are discussed by taking into account the elementary deformation mechanisms and the respective strengths of the γ and γ' phases. Experiments on a modified MC-NG alloy show that reinforcing the γ' phase by increasing the contents of Ti and Ta is an efficient way to recover a higher tensile strength at low temperatures. Rhenium addition and increase of the γ' solvus temperature are suggested to be beneficial for the high temperature tensile strength. Data published on various other single crystals are in agreement with these hypotheses.

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The effect of strain rate on the flow stress and dislocation behavior of a precipitation-hardened nickel-base alloy

Cited by 69 publications

References 2 publications

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

High Temperature Deformation Processes and Strengthening Mechanisms in Intermetallic Particulate Composites

Influence of Chemistry on the Tensile Yield Strength of Nickel-Based Single Crystal Superalloys

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