Observations of common microstructural issues associated with dynamic deformation phenomena: Twins, microbands, grain size effects, shear bands, and dynamic recrystallization

Murr, L. E.; Esquivel, E. V.

doi:10.1023/b:jmsc.0000013870.09241.c0

Cited by 131 publications

(44 citation statements)

References 30 publications

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“…In general, polycrystalline metals develop adiabatic shear bands during deformation at dynamic strain rates [49,53,55,68] and strain localization within these shear bands promotes a mechanically-driven grain refinement [48,49]. In this study, strain localization and local grain refinement were observed in the coarse-grained material after dynamic testing.…”

Section: The Deformation Mechanisms In the Coarse And Ufg Al-mg-sc Almentioning

confidence: 61%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractExperiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 -4 to ~10 3 s -1 .The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarsegrained material to superplasticity in the UFG alloy.

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Section: The Deformation Mechanisms In the Coarse And Ufg Al-mg-sc Almentioning

confidence: 61%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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“…30,31 As a result of planar glide, {111} twist boundaries composed of dislocations walls on {111} form. [31][32][33][34] . In this work, it is found that copious DBs mostly form in those grains that have only one preferential slip system (the Schmidt 6 factor is much larger than other slip systems).…”

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confidence: 99%

Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy

Jin

Zhang

Bjørge

et al. 2015

Applied Physics Letters

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Deformation twinning has rarely been observed in aluminum and its alloys because of their high stacking fault energy (SFE). Here, we report that a significant amount of Σ3 deformation twins could be generated in a coarse-grained Al-7Mg alloy by dynamic plastic deformation (DPD). A systematic investigation of the Σ3 boundaries shows that they are Σ3{112} type incoherent twin boundaries (ITBs). These ITBs have formed by gradual evolution from copious low-angle deformation bands through <111>-twist Σ boundaries by lattice rotation. These findings provide an approach to generate deformation twin boundaries in high SFE metallic alloys. It is suggested that high solution content of Mg in the alloy and the special deformation mode of DPD played an important role in formation of the Σ and ITBs.

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“…However, microbands at this low level of deformation are unlikely to evolve, since it has been demonstrated that microbands start forming only after rolling reductions of much more than 10% and then become common when deformation reaches rolling reductions of 20-50%. 23,27) Also, the misorientation across these lines are less than 0.8° and therefore these features are not considered to be microbands, because typical microbands accommodate misorientations of at least few degrees 28,29) which in some exceptional cases can be as high as ~18°. 30) It is obvious from the STEM and TEM images, in Figs.…”

Section: Discussionmentioning

confidence: 99%

Grain Boundary Deformation Phenomena and Secondary Growth of Goss Grains in a Fe-3.5%Si Steel

2017

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In this investigation, a long-standing grain growth question is addressed in a Fe-3.5% Si steel. This material undergoes secondary growth of Goss oriented grains, but the underlying mechanisms of this growth remain unresolved despite extensive investigations for almost a century. In this investigation, a key question concerning this subject is resolved i.e. whether the nature of primary recrystallization grain boundaries solely determines the growth of Goss grains during secondary recrystallization. To address this issue undeformed and lightly deformed samples were subjected to recrystallization annealing under identical conditions. Although the extent of the deformation is light, such that it creates only limited modifications in the grain boundary structures, the recrystallization mechanism changes from abnormal secondary growth to conventional grain growth. In the former case, recrystallization commences at higher temperatures when the MnS inhibiting particles become dissolved, and in the latter mechanism, recrystallization occurs at lower temperatures due to the differences in stored energy between grains sharing a common boundary. This occurs through strain-induced grain boundary migration.

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Observations of common microstructural issues associated with dynamic deformation phenomena: Twins, microbands, grain size effects, shear bands, and dynamic recrystallization

Cited by 131 publications

References 30 publications

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy

Grain Boundary Deformation Phenomena and Secondary Growth of Goss Grains in a Fe-3.5%Si Steel

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