High-pressure torsion-induced grain growth and detwinning in cryomilled Cu powders

Wen, Haiming; Zhao, Yaohua; Liu, Ying; Ertörer, Osman; Нестеров, К. М.; Исламгалиев, Р. К.; Valiev, Ruslan Z.; Lavernia, Enrique J.

doi:10.1080/14786435.2010.514579

Cited by 58 publications

(32 citation statements)

References 29 publications

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“…It is likely that the large grains in the Ti sample were formed during HPT through coalescence of the initial small grains in the cryomilled Ti powders. A similar phenomenon was observed in Cu powders subjected to HPT [18]. In this study a possible mechanism of non-uniform grain growth can be also associated with dynamic recrystallization, because SPD processing was performed at elevated deformation temperatures (T = 573 K) when grain boundary diffusional processes are activated.…”

Section: Introductionmentioning

confidence: 59%

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

Semenova

Timokhina

Исламгалиев

et al. 2015

Metals

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Abstract:We report on a study of the nanocrystalline structure in Ti, which was produced by cryogenic milling followed by subsequent consolidation via severe plastic deformation using high pressure torsion. The mechanisms that are believed to be responsible for the formation of grains smaller than 40 nm are discussed and the influence of structural characteristics, such as nanometric grains and oxide nanoparticles, on Ti hardening is established.

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Section: Introductionmentioning

confidence: 59%

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

Semenova

Timokhina

Исламгалиев

et al. 2015

Metals

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“…The statistical analysis based on a large number of TEM view fields revealed 30 nm of the average second-phase particle size ðlÞ in the as-HIPped 5083 Al. Inspection of the published literature [39] indicates that the second phases in the 5083 Al synthesized by consolidation of mechanically milled powders have been identified as Al 12 Mg 2 (CrMnFe), Al 12 (FeMn) 3 Si, Al 6 (CrMnFe), MgO, SiO 2 , and CuMgSiAl. Given that mechanically milled 5083 Al powders underwent a prolonged period during degassing and HIPping at high temperatures [degassing at 673 K (400°C) for 25 hours and HIPping at 648 K (375°C) for 4 hours], the as-HIPped 5083Al can be considered to achieve the equilibrium state and consequently, the volume fractions of the various second-phase particles were determined primarily by the equilibrium thermodynamic conditions [i.e., the equilibrium solubility of elements in the matrix Al at 648 K (375°C)].…”

Section: A Microstructure Of the As-hipped 5083 Almentioning

confidence: 99%

“…Furthermore, published experimental studies of stress-induced grain growth predominantly address phenomena that occur at room temperature (RT) [1,[3][4][5][6][7]9,[11][12][13] and cryogenic temperature. [10] In contrast, stress-induced grain growth at elevated temperatures has been investigated only in few studies, [2,8] which hinders our basic understanding of the aforementioned commercially important plastic deformation approaches, including extrusion, rolling, forging, etc.…”

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%

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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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“…Email: jin@sjtu.edu.cn Interaction between the reverse transformation and grain growth upon heating in nanocrystalline Co-Ni alloys was taken into consideration. [16,17] Since straininduced grain growth has been extensively reported in nanocrystalline materials under indentation, [18,19] high-pressure torsion, [20,21] compression [22] and tensile test, [23,24] it is interesting to study the microstructure evolution accompanying a plastic deformation process.…”

Section: Introductionmentioning

confidence: 99%

Strain-Induced Reverse Phase Transformation in Nanocrystalline Co-Ni Alloys

Jin

et al. 2014

Materials Research Letters

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A strain-induced reverse phase transformation from a hexagonal close-packed phase to a face-centered cubic phase was observed under tension at room temperature in electrodeposited nanocrystalline Co-Ni alloys with an average grain size of 15 nm. Such reverse phase transformation was previously observed only on heating. Investigation by transmission electron microscopy suggests a close relationship between the reverse phase transformation and grain growth during the tensile deformation.

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High-pressure torsion-induced grain growth and detwinning in cryomilled Cu powders

Cited by 58 publications

References 29 publications

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

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

Strain-Induced Reverse Phase Transformation in Nanocrystalline Co-Ni Alloys

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