A model of extrusions and intrusions in fatigued metals I. Point-defect production and the growth of extrusions

Eßmann, U.; Gösele, U.; Mughrabi, H.

doi:10.1080/01418618108239541

Cited by 488 publications

(234 citation statements)

References 56 publications

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“…1c. The fatigue cracks nucleate preferentially along the primary SBs similar to single crystals 3,5 . Besides, some SB cracks exist in the grain interior and some SB cracks even pass through the TB as detected before 23,24 .…”

Section: Resultsmentioning

confidence: 99%

“…Since the TB could be penetrated by the S1 SBs 14,15 , there is good strain compatibility near the TB which is parallel to the loading direction. So the TB shows higher fatigue cracking resistance than high-angle GB and the fatigue crack nucleates along the SB like in single crystals 3,5 . Whereas in the bicrystal with the TB perpendicular to the loading direction, the S3 SBs would pile up at the TB and could also penetrate through the TB partially 34 .…”

Section: Discussionmentioning

confidence: 99%

“…Generally, the intergranular fatigue cracking is interpreted in the way of dislocation impingement with strain incompatibility and stress concentration [3][4][5] . Since the TB could be penetrated by the S1 SBs 14,15 , there is good strain compatibility near the TB which is parallel to the loading direction.…”

Section: Discussionmentioning

confidence: 99%

“…However, the dislocation pileups could generate stress concentration and strain incompatibility at the GB, which facilitates the GB cracking under cyclic loading [3][4][5] . And it is found that the GB is always the preferential fatigue cracking site intrinsically rather than the slip band (SB) no matter whatever angle the GB is inclined at in the bicrystals 3 .…”

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confidence: 99%

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Controllable fatigue cracking mechanisms of copper bicrystals with a coherent twin boundary

Zhang

et al. 2014

Nat Commun

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Controllable fatigue cracking mechanisms of copper bicrystals with a coherent twin boundary

Zhang

et al. 2014

Nat Commun

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“…The dislocation structure of the slip bands formed during the cyclic deformation of Ni-base superalloys is seen to be very different from the persistent slip bands (PSBs) so extensively studied for Cu. Classical PSBs have been described [28][29][30] and reviewed [25,31,32] in detail elsewhere. [27].…”

Section: Cyclic Deformation Of Ni-base Superalloysmentioning

confidence: 99%

Microstructural aspects of fatigue in Ni-base superalloys

Antolovich

2015

Phil. Trans. R. Soc. A.

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Nickel-base superalloys are primarily used as components in jet engines and land-based turbines. While compositionally complex, they are microstructurally simple, consisting of small (50–1000 nm diameter), ordered, coherent Ni 3 (Al,Ti)-type L1 2 or Ni 3 Nb-type DO 22 precipitates (called γ ′ and γ ′′ , respectively) embedded in an FCC substitutional solid solution consisting primarily of Ni and other elements which confer desired properties depending upon the application. The grain size may vary from as small as 2 μm for powder metallurgy alloys used in discs to single crystals the actual size of the component for turbine blades. The fatigue behaviour depends upon the microstructure, deformation mode, environment and cycle time. In many cases, it can be controlled or modified through small changes in composition which may dramatically change the mechanism of damage accumulation and the fatigue life. In this paper, the fundamental microstructural, compositional, environmental and deformation mode factors which affect fatigue behaviour are critically reviewed. Connections are made across a range of studies to provide more insight. Modern approaches are pointed out in which the wealth of available microstructural, deformation and damage information is used for computerized life prediction. The paper ends with a discussion of the very important and highly practical subject of thermo-mechanical fatigue (TMF). It is shown that physics-based modelling leads to significantly improved life prediction. Suggestions are made for moving forward on the critical subject of TMF life prediction in notched components.

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Ultra High Purity Alloys for the Study of Hydrogen Effects on Fatigue Mechanisms in Ni and Ni–Cr–Fe at 300 K

Renaudot

Wolski

Magnin

et al. 1997

phys. stat. sol. (a)

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Low‐cycle fatigue and corrosion fatigue mechanisms of ultra‐high‐purity (UHP) Ni and Ni‐base alloys in H2SO4 solutions are analysed. UHP materials are used to eliminate the impurity effects, including those on grain boundaries which can promote hydrogen embrittlement. Particular attention is paid to the conditions for hydrogen absorption and its effect on damage processes. Hydrogen embrittlement is analysed in terms of persistent slip band–grain boundary (PSB–GB) interactions and hydrogen diffusion short circuits at grain boundaries. The effect of chromium on the kinetics of the PSB formation as well as on both anodic dissolution and hydrogen absorption is emphasised.

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A model of extrusions and intrusions in fatigued metals I. Point-defect production and the growth of extrusions

Cited by 488 publications

References 56 publications

Controllable fatigue cracking mechanisms of copper bicrystals with a coherent twin boundary

Controllable fatigue cracking mechanisms of copper bicrystals with a coherent twin boundary

Microstructural aspects of fatigue in Ni-base superalloys

Ultra High Purity Alloys for the Study of Hydrogen Effects on Fatigue Mechanisms in Ni and Ni–Cr–Fe at 300 K

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