Reactions of slip dislocations with twin boundary in Fe-Si bicrystals

Gemperle, A.; Zárubová, N.; Gemperlová, J.

doi:10.1007/s10853-005-2693-1

Cited by 19 publications

(13 citation statements)

References 10 publications

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“…As previously reviewed, such intersection processes could greatly generate lattice point defects in the vicinity of the slip-twin boundary intersections. [29,30] Finally, it must be pointed out that no microstructures of persistent slip band (PSB) type were detected, although a large number of TEM disks for all testing conditions were examined.…”

Section: Microstructure Changes Through Tem Observationmentioning

confidence: 99%

“…As most of these dislocations are constrained inside the twins, their moving path is rather limited by those twins as well. Point defects, as the results of the interactions between these mobile dislocations and interactions with twin boundaries, [29,30] would promote dislocation climb, leading to dislocation annihilation. The reduction of dislocation density as well as the simplification of dislocation configurations, evidenced in Figures 9 and 10, provided convincing evidence for the preceding arguments.…”

Section: Initial Cyclic Softening Behaviormentioning

confidence: 99%

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Cyclic Deformation Response of β-Annealed Ti-5Al-5V-5Mo-3Cr Alloy Under Compressive Loading Conditions

Huang

Wang

Zhou

2011

Metall Mater Trans A

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This article reports the cyclic deformation behavior of the b-annealed metastable Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy under the condition of pure compressive fatigue stress. The following three aspects, namely, the mechanical response, the surface morphology evolution, and the dislocation structures, were systematically investigated. Under all testing conditions, the material demonstrated cyclic softening in the initial cycles followed by saturation. The progressive observation of surface morphology at fixed locations, but after different numbers of cycles, elucidated typical planar slip behavior and the early appearance of fatigue microcracks, which were found often to be induced by the highly localized planar slip bands. The transmission electron microscopy (TEM) study revealed dislocation annihilation upon cycling, i.e., the reduction of dislocation density as well as the simplification of dislocation configurations. In addition, detwinning and changed twin boundary structures upon cycling were also detected. Such activities, together with the intersection of coherent x precipitates by moving dislocations, are considered to be responsible for the initial softening, whereas the dislocation dipole flip-flop mechanism is presumably responsible for the cyclic saturation behavior. An attempt was made to explain the strain-localized planar slip behavior by considering the stacking fault energy (SFE) as well as the free-electron-to-atom (e/a) ratio. The nanoscaled x and a precipitation in the b matrix may also contribute to the planar slip behavior. The effect of the microstructure in the as-received material was also analyzed for the strain localization and planar-slip mode.

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Section: Microstructure Changes Through Tem Observationmentioning

confidence: 99%

Section: Initial Cyclic Softening Behaviormentioning

confidence: 99%

Cyclic Deformation Response of β-Annealed Ti-5Al-5V-5Mo-3Cr Alloy Under Compressive Loading Conditions

Huang

Wang

Zhou

2011

Metall Mater Trans A

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“…Transmission electron microscopy (TEM) observations of in situ straining tests have been able to provide valuable information about the processes occurring during the dislocation-grain-boundary (DGB) interactions (for experimental studies of DGB interactions in bcc metals see [3][4][5][6][7][8]). More recently, nanoindentation experiments have also been used to assess the resistance of GBs to slip transmission [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Atomistic simulations of interactions between the 1 / 2⟨111⟩ edge dislocation and symmetric tilt grain boundaries in tungsten

Cheng¹,

Mrovec²,

Gumbsch³

2008

Philosophical Magazine

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The strength of polycrystals is largely controlled by the interaction between lattice dislocations and grain boundaries. The atomistic details of these interactions are difficult to discern even by advanced high-resolution microscopy methods. In this paper we present results of atomistic simulations of interactions between an edge dislocation and three symmetric tilt grain boundaries in body-centred cubic tungsten. Our simulations reveal that the outcome of the dislocation-grainboundary interaction depends sensitively on the grain boundary structure, the geometry of the slip systems in neighbouring grains, and the precise location of the interaction within the grain boundary. A detailed analysis of the evolution of the grain boundary structures and local stress fields during dislocation absorption and transmission is provided.

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“…Although some experimental works [118,119] and recent computational works [35,38] also consider more general grain boundaries, various findings exist in regard to the influence of the grain boundary type. While in [12][13][14] transmission was found to depend on the type of the investigated symmetric grain boundaries, in [93], the behavior of coincidence site lattice boundaries and general boundaries did not appear to be substantially different regarding slip transmission. Open questions from an experimental point of view also include the evaluation of continuity of slip traces.…”

Section: Resultsmentioning

confidence: 74%

“…In [46], it was concluded that the criteria are applicable for hexagonal close-packed (HCP) materials, too. For body-centered cubic (BCC) materials, the existing work is still not exhaustive up to date, e.g., [13,14,47,48]. In the latter two experimental works, the minimization of the RBV was confirmed for BCC.…”

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confidence: 99%

Review on slip transmission criteria in experiments and crystal plasticity models

et al. 2015

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A comprehensive overview is given of the literature on slip transmission criteria for grain boundaries in metals, with a focus on slip system and grain boundary orientation. Much of this extensive literature has been informed by experimental investigations. The use of geometric criteria in continuum crystal plasticity models is discussed. The theoretical framework of Gurtin (2008, J. Mech. Phys. Solids 56, p. 640) is reviewed for the single slip case. This highlights the connections to slip transmission criteria from the literature that are not discussed in the work itself. Different geometric criteria are compared for the single slip case with regard to their prediction of slip transmission. Perspectives on additional criteria, investigated in experiments and used in computational simulations, are given.

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Reactions of slip dislocations with twin boundary in Fe-Si bicrystals

Cited by 19 publications

References 10 publications

Cyclic Deformation Response of β-Annealed Ti-5Al-5V-5Mo-3Cr Alloy Under Compressive Loading Conditions

Cyclic Deformation Response of β-Annealed Ti-5Al-5V-5Mo-3Cr Alloy Under Compressive Loading Conditions

Atomistic simulations of interactions between the 1 / 2⟨111⟩ edge dislocation and symmetric tilt grain boundaries in tungsten

Review on slip transmission criteria in experiments and crystal plasticity models

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