Low angle tilt boundary migration coupled to shear deformation

Molodov, Dmitri A.; Ivanov, V.A.; Gottstein, Günter

doi:10.1016/j.actamat.2006.10.045

Cited by 190 publications

(103 citation statements)

References 12 publications

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“…The presence of equiaxed and dislocation free (sub)grains with thin smooth boundaries (figure 1f) suggests the development of recovery and even recrystallization processes that seems to be quite unusual for such a low temperature. However, high stresses can in some cases compensate for the insufficient thermal activation and induce local migration of grain boundaries and recrystallization [8][9][10].…”

Section: Microstructure Evolution In Timentioning

confidence: 99%

Twinning induced nanostructure formation during cryo-deformation

Klimova

D’yakonov

Zherebtsov

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In the present work the influence of cryo-rolling to a true strain ε=2.66 on twinning and formation of ultrafine-grained/nanostructure in commercial-purity titanium and Fe-0.3C-23Mn-1.5Al TWIP steel was quantified using scanning and transmission electron microscopy. Different influence of twinning on the kinetics of microstructure refinement and nanostructure formation in titanium and steel was revealed. In titanium twin boundaries during deformation transform into arbitrary high-angle grain boundaries thereby promoting the microstructure refinement to a grain/subgrain size of 80 nm. In steel twinning has less pronounced influence on the microstructure refinement. However, very fine grains/subgrains with the size of 30-50 nm was observed in the microstructure after rolling at 77K to a true thickness strain of 2.66.

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Section: Microstructure Evolution In Timentioning

confidence: 99%

Twinning induced nanostructure formation during cryo-deformation

Klimova

D’yakonov

Zherebtsov

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The formation of these grains/subgrains during warm deformation is usually attributed to the development of continuous dynamic recrystallization, but in the case of low temperatures it seems rather unusual because of the lack of sufficient thermal acti vation of the process. At the same time, in the litera ture [24][25][26], local recrystallization and grain bound ary migration are possible at a low temperature under high stress. One of the conditions that stimulate the dynamic recrystallization at low temperatures in highly deformed materials is a high concentration of vacancies [27,28].…”

Section: Discussionmentioning

confidence: 99%

Microstructure evolution of commercial-purity titanium during cryorolling

D’yakonov

Zherebtsov

Klimova

et al. 2015

Phys. Metals Metallogr.

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Abstract-Electron backscatter diffraction and transmission electron microscopy have been used to analyze the microstructural evolution of titanium during rolling at a cryogenic temperature (T = -196°C). It has been found that intensive twinning at the cryogenic deformation temperature accelerates the kinetics of micro structure refinement. The quantitative analysis of microstructure evolution in titanium upon cryorolling has shown that structure evolution is mainly related to mechanical twinning in the initial stages. A substructure is developed and deformation induced high angle boundaries are formed in the range of mean and high degrees of deformation. It was established that rolling to the total degree of deformation ε = 93 % (e = 2.6) at T = -196°C leads to the formation of a titanium microstructure with a grain/subgrains size approximately 80 nm. The contribution of mechanical twinning and dislocation gliding in structural transformations in tita nium with increasing degree of deformation during cryorolling is discussed.

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“…[2,7,14,18,20,21,24,31] Noteworthy, however, is the fact that most published theoretical and experimental papers related to stressinduced grain growth focus on single-phase materials and as a result, material systems containing secondphase particles have been rarely reported. Moreover, although many materials that contain a high level of solute segregation at GBs are selected as model materials for studies of stress-induced grain growth, [5,9,11,32,33] the influence of solute atoms segregated at GBs on stress-induced grain growth has been investigated only in very limited cases.…”

Section: Stress-induced Grain Growth Has Attractedmentioning

confidence: 99%

“…Recent studies on stress-induced grain growth involve in situ [1][2][3][4][5][6][7][8] and ex situ [9][10][11][12][13] transmission electron microscopy (TEM) analysis, optical microscopy observations [14,15] , and molecular dynamic (MD) simulations. [16][17][18][19][20][21][22][23][24] Related published theoretical and experimental results reveal that there are two roles that an externally applied stress plays during grain growth:…”

Section: Stress-induced Grain Growth Has Attractedmentioning

confidence: 99%

Erratum to: Stress-Induced Grain Growth in an Ultra-Fine Grained Al Alloy

Lin

Wen

Liu

et al. 2014

Metall Mater Trans B

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This paper reports on a study of the stress-induced grain growth phenomenon in the presence of second-phase particles and solutes segregated at grain boundaries (GBs) during high-temperature deformation of an ultra-fine grained (UFG) Al alloy synthesized via the consolidation of mechanically milled powders. Our results show that grain growth was essentially inhibited during annealing at 673 K (400°C) in the absence of an externally applied stress, whereas in contrast, grain growth was enhanced by a factor of approximately 2.7 during extrusion at 673 K (400°C). These results suggest that significant grain growth during hot extrusion was attributable to the externally applied stresses stemming from the state of stress imposed during extrusion and that the externally applied stresses can overcome the resistance forces generated by second-phase particles and solutes segregated at GBs. The mechanisms underlying stressinduced grain growth were identified as GB migration and grain rotation, which were accompanied by dynamic recovery and possible geometric dynamic recrystallization, while discontinuous dynamic recrystallization did not appear to be operative. His research interests include the synthesis and behavior of nanostructured and multi-scale materials with particular emphasis on processing fundamentals and physical behavior; thermal spray processing of nanostructured materials; spray atomization and deposition of structural materials; high temperature-high pressure atomization processes; mathematical modeling of advanced materials and processes; and additive manufacturing. He has published 515 journal and 225 conference publications on topics ranging from nanomaterials to extremely strong aluminum alloys. Prof. Lavernia has delivered more than 150 invited lectures and seminars in over 17 countries. He

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Low angle tilt boundary migration coupled to shear deformation

Cited by 190 publications

References 12 publications

Twinning induced nanostructure formation during cryo-deformation

Twinning induced nanostructure formation during cryo-deformation

Microstructure evolution of commercial-purity titanium during cryorolling

Erratum to: Stress-Induced Grain Growth in an Ultra-Fine Grained Al Alloy

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