In-situ observation of plastic deformation of Fe-Si bicrystals by white-beam synchrotron radiation topography

Polcarová, M.; Gemperlová, J.; Brádler, J.; Jacques, Alain; George, A.; Priester, L.

doi:10.1080/014186198253705

Cited by 25 publications

(10 citation statements)

References 26 publications

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“…They are described by different grains disorientation and different grain boundary (GB) planes (figure 1), which results in different difficulties in slip transition across GBs. Reasons for this choice are given in detail in (Polcarová et al 1998) two cases the slip transition seems to have a low probability. Some mechanisms for dislocation generation must exist in the GB.…”

Section: Methodsmentioning

confidence: 99%

“…The Bragg angle was 65 • . The same procedure of observation as described in (Polcarová et al 1998) for bicrystals deformed by tension was applied. Then layers of approximately 200 µm were removed by mechanical and chemical polishing from the inspected surfaces and the topographs were repeated to reveal the behaviour of slip bands in the sample interior.…”

Section: Observation After Deformationmentioning

confidence: 99%

“…Bicrystals are most suitable for the study of the interaction of slip dislocations with the GBs owing to well-defined grains disorientation and GB plane orientation. In our previous papers (Polcarová et al 1998, Polcarová andBrádler 1988) the observation of the slip transfer over the GB in bicrystals of an alloy of Fe-4 at%Si was described. X-ray diffraction topography using both laboratory x-ray sources and synchrotron radiation (SR) was applied.…”

Section: Introductionmentioning

confidence: 99%

“…Large amount of data including the number of slip dislocations stopped at the GBs can be drawn out from the topographs by evaluating the diffraction contrast. Three types of bicrystals with different mutual orientation of the slip systems with respect to the GB were studied (Polcarová et al 1998). There is not much difference in the three studied cases having equal and different slip systems in both grains.…”

Section: Introductionmentioning

confidence: 99%

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Synchrotron radiation topographic study of slip transfer across grain boundaries in Fe–Si bicrystals

Polcarová

Gemperlová

Jacques

et al. 2006

J. Phys. D: Appl. Phys.

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The transfer of the common slip system across grain boundaries was examined. Bicrystals of alloys Fe–Si with Si content 4 and 5.5 at% were used for both tension and compression straining. The progress of the deformation was followed by synchrotron radiation diffraction topography after straining and under increasing external stress. An x-ray sensitive camera was used for recording the topographs in addition to the classical technique using photographic plates. Three slightly different settings with different sensitivities to interplanar spacing (deformation) and orientation variations of the adjacent crystal regions were applied. The movement of the slip bands was followed. A distortion of the image appeared at the grain boundary when the slip bands stopped there and decreased or nearly disappeared when the slip bands crossed it after an increase in the applied stress. The distortion is explained by elastic deformation around the heads of the slip bands stopped at the boundary. True slip transfers are differentiated from the false ones by observing elastic deformation in early deformation stages and by optical observation of slip pattern after deformation. The transfer of the common slip system across a twin boundary, whereas expected to be direct, required stress accumulation. The twin boundary proved to be a real barrier. The results obtained for specimens with different Si content were compared.

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Section: Methodsmentioning

confidence: 99%

Section: Observation After Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synchrotron radiation topographic study of slip transfer across grain boundaries in Fe–Si bicrystals

Polcarová

Gemperlová

Jacques

et al. 2006

J. Phys. D: Appl. Phys.

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show abstract

“…providing that three criteria are fulfilled [41][42][43], but it has been experimentally shown that violations of the empirical rules occur even in the most favourable case of Σ  3 [44,45].…”

Section: Dislocations -Twin Boundary Interactionsmentioning

confidence: 99%