Dislocation and grain boundary interactions in metals

Shen, Zhiyong; Wagoner, R. H.; Clark, W.A.T.

doi:10.1016/0001-6160(88)90058-2

Cited by 447 publications

(188 citation statements)

References 18 publications

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“…This is quite consistent with the well established results of Burger's vector analysis showing unambiguously that the loops formed in neutron-irradiated copper are of interstitial type (e.g. Singh et al 1986 andEnglish et al 1987). At doses of 0.1 dpa and greater, the small loops coalesced to form raft-like agglomerates of loops that at first glance appeared as a loose network of dislocation segments (see figures 2a and 3a in Singh et al 2001).…”

Section: Ofhc-cu and Cucrzr Alloysupporting

confidence: 90%

“…In many other cases, however, they are not transmitted into the other grain and remain contained between two grain boundaries or twin boundaries. These observations are, in general terms, consistent with the conclusion of Shen et al (1988) that events such as dislocation transmission across a grain boundary take place at a variety of local stresses and encounter a wide range of obstacle strengths. In a recent atomistic computer simulation study of dislocation transmission through grain boundaries, Christiansen et al (2004) have shown that such interactions very often produce sessile dislocation configuration instead of transmission.…”

Section: Transmission Of Cleared Channelssupporting

confidence: 88%

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Initiation and propagation of cleared channels in neutron-irradiated pure copper and a precipitation hardened CuCrZr alloy

Edwards

Singh

Bilde-Sørensen

2005

Journal of Nuclear Materials

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(max. 2000 char.):The phenomenon of plastic flow localization in the form of "cleared" channels has been frequently observed in neutron irradiated metals and alloys for more than 40 years. So far, however, no experimental evidence as to how and where these channels are initiated during postirradiation deformation has emerged. Recently we have studied the problem of initiation and propagation of cleared channels during post-irradiation tensile tests of pure copper and a copper alloy irradiated with fission neutrons. Tensile specimens of pure copper and a precipitation hardened copper alloy (CuCrZr) were neutron irradiated at 323 and 373K to displacement doses in the range of 0.01 to 0.3 dpa (displacement per atom) and tensile tested at the irradiation temperature. The stress-strain curves clearly indicated the occurrence of a yield drop. The post-deformation microstructural examinations revealed that the channels are formed already in the elastic regime and their density increases with increasing plastic strain. The channels appear to have been initiated at grain boundaries, twin boundaries, at relatively large inclusions and even at the previously formed cleared channels. Even though the channels are produced throughout the whole tensile test, no clear evidence has been found for the operation of Frank-Read sources in the volume between the channels. Channels have been observed to penetrate through annealing twins, in some cases stopping at the opposite twin boundary and in other cases penetrating even through the opposite twin boundary and continuing further into the grain. In some cases channels have been found to penetrate through grain boundaries too. It is suggested that the high stress levels reached during deformation of the irradiated specimens activate dislocation sources at the sites of stress concentration at the boundaries and inclusions. The propagation of these newly generated dislocations in the matrix causes the formation of cleared channels. Implications of these results are discussed with specific reference to the origin and consequences of plastic flow localization.

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Section: Ofhc-cu and Cucrzr Alloysupporting

confidence: 90%

Section: Transmission Of Cleared Channelssupporting

confidence: 88%

Initiation and propagation of cleared channels in neutron-irradiated pure copper and a precipitation hardened CuCrZr alloy

Edwards

Singh

Bilde-Sørensen

2005

Journal of Nuclear Materials

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“…The most common stress relief mechanism is by generating new dislocations in the neighbouring grain [30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism is accomplished by dislocation absorption and subsequent re-emission. The emitted dislocations could either connect to the previous slip band or be displaced along grain boundary [34]. An energy barrier…”

Section: Introductionmentioning

confidence: 99%

Slip band–grain boundary interactions in commercial-purity titanium

2014

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“…A criterion based on the N-value was then developed by introducing the geometric relationship of the intersection between each slip plane in a grain and a GB plane. 18,19 The criterion, called the M-value, predicts the degree of propagation of plastic deformation across the GB. Subsequently, since the strain energy of the residual dislocation between an incoming dislocation and an outgoing dislocation has to be minimized for easier transfer across the GB, the residual GB dislocation condition has been added to the M-value.…”

Section: Introductionmentioning

confidence: 99%

A predictive model for transferability of plastic deformation through grain boundaries

Tsuru

Shibutani

Hirouchi³

2016

AIP Advances

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The material strengths of polycrystalline metals have been widely predicted according to the grain size, where yield stress is governed by slip transfer through the grain boundary (GB). The transferability of a dislocation across a GB is enormously important in the deformation process as well as the interaction between a dislocation and GB. This paper proposes a new criterion for the transferability of dislocations through a GB that considers both the intergranular crystallographic orientation of slip systems and the applied stress condition. Atomistic simulations were carried out to investigate the slip transfer event of simple bicrystals composed of Σ3(1̄12) GB than Σ3(1̄11) GBs under uniaxial deformation and to illustrate the availability of this criterion. As a result, in contrast to the predictions of conventional criteria such as the M-value, dislocations propagated more easily across the Σ3(1̄11) and Σ3(1̄12) GB under given stress states, reflecting a larger L′-value of Σ3 bicrystal associated with higher transferability.

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Dislocation and grain boundary interactions in metals

Cited by 447 publications

References 18 publications

Initiation and propagation of cleared channels in neutron-irradiated pure copper and a precipitation hardened CuCrZr alloy

Initiation and propagation of cleared channels in neutron-irradiated pure copper and a precipitation hardened CuCrZr alloy

Slip band–grain boundary interactions in commercial-purity titanium

A predictive model for transferability of plastic deformation through grain boundaries

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