Cutting Apart of γ″ Precipitates by Dislocations Emitted from Nanoscale Surface Notches in Ni-Base Alloy 725

Wang, M. S.; Hanson, John P.; Gradečak, Silvija; Demkowicz, Michael J.

doi:10.1080/21663831.2013.775187

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…All of the fracture surfaces in our alloy-725 sample are interconnected into a single, continuous crack. This finding suggests that there is no crack initiation in the interior of the sample, consistent with the view that all cracks initiate at free surfaces in Ni-base alloy 725 63 as well as in other materials 64 . It also indicates that there is no toughening by microcracking in H-charged alloy 725.…”

Section: Discussionsupporting

confidence: 85%

Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725

et al. 2018

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Hydrogen embrittlement (HE) causes sudden, costly failures of metal components across a wide range of industries. Yet, despite over a century of research, the physical mechanisms of HE are too poorly understood to predict HE-induced failures with confidence. We use non-destructive, synchrotron-based techniques to investigate the relationship between the crystallographic character of grain boundaries and their susceptibility to hydrogen-assisted fracture in a nickel superalloy. Our data lead us to identify a class of grain boundaries with striking resistance to hydrogen-assisted crack propagation: boundaries with low-index planes (BLIPs). BLIPs are boundaries where at least one of the neighboring grains has a low Miller index facet—{001}, {011}, or {111}—along the grain boundary plane. These boundaries deflect propagating cracks, toughening the material and improving its HE resistance. Our finding paves the way to improved predictions of HE based on the density and distribution of BLIPs in metal microstructures.

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Section: Discussionsupporting

confidence: 85%

Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725

et al. 2018

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“…The precipitates are uniformly distributed within the FCC γ matrix and have disk-shaped geometry, with a length of ~9 nm and width of ~3 nm. These results are comparable to what has been reported for wrought IN725 [37]. We do not observe any other obvious secondary phases in our TEM specimens.…”

Section: Precipitation Of Intermetallic Phasessupporting

confidence: 92%

“…We compared the results to those obtained from wrought IN725. The wrought IN725 exhibits a fully recrystallised, precipitation-hardened microstructure, as studied previously [37,38]. We used a BioLogic potentiostat controlled by the software EC-Lab (BioLogic).…”

Section: Electrochemical and Corrosion Testingmentioning

confidence: 99%

Laser powder bed fusion of high-strength and corrosion-resistant Inconel alloy 725

Todaro

Rashidi

Liu

et al. 2022

Materials Characterization

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“…It has been suggested that g 0 precipitates, which are present in Inconel 725 (ref. 40), may also play a role in crack initiation on S3 CTBs 41 .…”

Section: Discussionmentioning

confidence: 99%

The dual role of coherent twin boundaries in hydrogen embrittlement

et al. 2015

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Hydrogen embrittlement (HE) causes engineering alloys to fracture unexpectedly, often at considerable economic or environmental cost. Inaccurate predictions of component lifetimes arise from inadequate understanding of how alloy microstructure affects HE. Here we investigate hydrogen-assisted fracture of a Ni-base superalloy and identify coherent twin boundaries (CTBs) as the microstructural features most susceptible to crack initiation. This is a surprising result considering the renowned beneficial effect of CTBs on mechanical strength and corrosion resistance of many engineering alloys. Remarkably, we also find that CTBs are resistant to crack propagation, implying that hydrogen-assisted crack initiation and propagation are governed by distinct physical mechanisms in Ni-base alloys. This finding motivates a re-evaluation of current lifetime models in light of the dual role of CTBs. It also indicates new paths to designing materials with HE-resistant microstructures.

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Cutting Apart of γ″ Precipitates by Dislocations Emitted from Nanoscale Surface Notches in Ni-Base Alloy 725

Cited by 8 publications

References 22 publications

Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725

Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725

Laser powder bed fusion of high-strength and corrosion-resistant Inconel alloy 725

The dual role of coherent twin boundaries in hydrogen embrittlement

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