Physical Metallurgy of the Nickel-Based Superalloys

Reed, Roger C.; Rae, C.M.F.

doi:10.1016/b978-0-444-53770-6.00022-8

Cited by 113 publications

(86 citation statements)

References 126 publications

(185 reference statements)

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“…At really high temperatures (T>900 C), the dislocation climbing of c 0 -precipitates and the rafting processes becomes the dominating plastic mechanisms degrading even more the mechanical strength of the alloy. [35][36][37] As a result, the strong effect of the local chemical changes on the creep and plastic strength must be included in future models. One of the first experimental attempts to accomplish with this purpose has been presented by Smith et al [2] proposing the addition of certain elements (Ti, Ta, and Nb) to block the effect of the c-stabilizers and eventually strengthening the alloy.…”

Section: Implications Of the Plastic-segregation Eventsmentioning

confidence: 99%

Segregation-Assisted Plasticity in Ni-Based Superalloys

Barba

Smith

Miao

et al. 2018

Metall Mater Trans A

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Correlative high-resolution transmission electron microscopy and energy-dispersive X-ray spectroscopy are used to study deformation-induced planar faults in the single-crystal superalloy MD2 crept at 800°C and 650 MPa. Segregation of Cr and Co at microtwins, anti-phase boundaries (APB), and complex/superlattice extrinsic and intrinsic stacking faults (CESF/SESF and CISF/SISF) is confirmed and quantified. The extent of this is found to depend upon the fault type, being most pronounced for the APB. The CESF/SESF is studied in detail due to its role as a precursor of the microtwins causing the majority of plasticity under these conditions. Quantitative modeling is carried out to rationalize the findings; the experimental results are consistent with a greater predicted velocity for the lengthening of the CESF/ SESF-compared with the other types of fault-and hence confirm its role in the diffusion-assisted plasticity needed for the microtwinning mechanism to be operative.

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Section: Implications Of the Plastic-segregation Eventsmentioning

confidence: 99%

Segregation-Assisted Plasticity in Ni-Based Superalloys

Barba

Smith

Miao

et al. 2018

Metall Mater Trans A

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“…Joint L1 lies adjacent to the indentation and thus the grains beneath it store the largest amount of deformation energy. Therefore, they have more driving force for recrystallization than those grains under other joints [16].…”

Section: Resultsmentioning

confidence: 99%

Robust tuning of Kirkendall void density in circuit interconnections through substrate strain annealing

Cai

Wang

et al. 2018

J Mater Sci: Mater Electron

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Unpredictable Kirkendall void formation at the interface of circuit interconnections underlies degradation in electronics, yet there is a lack of effective approaches to curb the amount of these voids. Here we developed a strain-anneal method to tailor grain size distributions in the copper substrate of interconnections, and demonstrate quantitatively that not only the removal of the impurities but also an increase in the grain size of the substrates leads to an appreciable decline in the void density. The interconnections on the substrate recrystallized at a high annealing temperature show the massive porosity and the increased sensitivity of the voiding to the grain size. Our findings have broad implications for manipulation of void propensity in many other hetero-interfaces and are essential for high-performance circuit bonding in high temperature/high power electronic devices based on wide band gap semiconductors.

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“…First, the proof stress is not influenced by strain rate by strain rate and/or temperature ramping rate until a peak stress has been reached, in agreement with previous experimental and modeling work. [31,[36][37][38] In this anomalous yielding regime, cross-slip of short dislocation segments from f111g to f001g glide planes-leading to either small Paidar-Pope-Vitek locks or large Kear-Wilsdorf locks [39,40] -is operative. Such cross-slip events are promoted by the anisotropy of both APB energy and elastic properties along the f111g and f001g planes.…”

Section: B Stepped-temperature Testsmentioning

confidence: 99%

“…The initial decline in proof stress has been commonly related to slip activation on the cube plane by a=2h110i pairs and, at higher temperatures, by perfect a[100] single dislocations. [40] Recent studies have identified diffusion-activated plasticity as an additional operating mechanism which could explain the decreasing strength in this temperature regime. [41,42] A further significant weakening effect at higher temperatures is a decrease in c 0 volume fraction, / p .…”

Section: B Stepped-temperature Testsmentioning

confidence: 99%

On the Rapid Assessment of Mechanical Behavior of a Prototype Nickel-Based Superalloy using Small-Scale Testing

Sulzer

Alabort

Németh

et al. 2018

Metall Mater Trans A

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An electro-thermal mechanical testing (ETMT) system is used to assess the mechanical behavior of a prototype single-crystal superalloy suitable for industrial gas turbine applications. Miniaturized testpieces of a few mm 2 cross section are used, allowing relatively small volumes to be tested. Novel methods involving temperature ramping and stress relaxation are employed, with the quantitative data measured and then compared to conventional methods. Advantages and limitations of the ETMT system are identified; particularly for the rapid assessment of prototype alloys prior to scale-up to pilot-scale quantities, it is concluded that some significant benefits emerge.

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Physical Metallurgy of the Nickel-Based Superalloys

Cited by 113 publications

References 126 publications

Segregation-Assisted Plasticity in Ni-Based Superalloys

Segregation-Assisted Plasticity in Ni-Based Superalloys

Robust tuning of Kirkendall void density in circuit interconnections through substrate strain annealing

On the Rapid Assessment of Mechanical Behavior of a Prototype Nickel-Based Superalloy using Small-Scale Testing

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