Nano- and micro-scale free volume in ultrafine grained Cu–1wt.%Pb alloy deformed by equal channel angular pressing

Divinski, Sergiy V.; Ribbe, Jens; Baither, D.; Schmitz, Guido; Reglitz, Gerrit; Rösner, Harald; Sato, K.; Estrin, Yuri; Wilde, Gerhard

doi:10.1016/j.actamat.2009.07.066

Cited by 87 publications

(58 citation statements)

References 43 publications

(73 reference statements)

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“…The extremely fast tracer penetration in severely deformed pure Ni is consistent with the previous results of radiotracer diffusion measurements on ultra-fast transport in SPDprocessed pure Cu [122][123][124] and Cu-based alloys [125][126] Such an observation substantiates the complexity of "non-equilibrium GBs". We have to admit that in addition to common parameters required to specify a relaxed high-angle grain boundary (i.e.…”

supporting

confidence: 79%

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

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Wilde

Divinski

et al. 2012

Materials Science and Engineering: A

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Grain boundaries in ultrafine grained (UFG) materials processed by severe plastic deformation (SPD) are often called "non-equilibrium" grain boundaries. Such boundaries are characterized by excess grain boundary energy, presence of long range elastic stresses and enhanced free volumes. These features and related phenomena (diffusion, segregation, etc.) have been the object of intense studies and the obtained results provide convincing evidence of the importance of a non-equilibrium state of high angle grain boundaries for UFG materials with unusual properties. The aims of the present paper are first to give a short overview of this research field and then to consider tangled, yet unclear issues and outline the ways of oncoming studies. A special emphasis is given on the specific structure of grain boundaries in ultrafine grained materials processed by SPD, on grain boundary segregation, on interfacial mixing linked to heterophase boundaries and on grain boundary diffusion. The connection between these unique features and the mechanical properties or the thermal stability of the ultrafine grained alloys is also discussed.

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supporting

confidence: 79%

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

Sauvage

Wilde

Divinski

et al. 2012

Materials Science and Engineering: A

488

219

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“…This conclusion agrees with recent reports demonstrating that the enhanced atomic diffusion in nanostructured material after equal-channel angular pressing (ECAP) is attributed to the introduction of extra free volumes due to the high population of lattice defects in the nanostructure. 64,65 It is reasonable to conclude from these results that the deformation-induced rapid diffusion not only bonds the Al and Mg phases to give a multi-layered structure but also becomes the driving force for the formation of the b-Al 3 Mg 2 intermetallic nano-layers at room temperature. Thus, an intermetallic-based Al matrix nanocomposite is introduced around the periphery of the Al-Mg alloy during processing by HPT through 5 turns.…”

Section: 44-47mentioning

confidence: 96%

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

et al. 2015

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Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al-Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi-layered structure in the central region of the disk but with an intermetallic b-Al 3 Mg 2 phase in the form of nano-layers in the nanostructured Al matrix near the edge of the disk. The activation energy for diffusion bonding of the Al and Mg phases was estimated and it is shown that this value is low and consistent with surface diffusion due to the very high density of vacancy-type defects introduced by HPT processing. The results demonstrate a significant potential for making use of HPT processing in the preparation of new alloy systems.

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“…According to Nazarov et al [27], the large concentration of extrinsic non-equilibrium defects in "non-equilibrium" GBs enhances the GB diffusivity by increasing the accumulated free volume and GB excess free energy. The ultrafast diffusivity along some paths in SPD-processed materials is well documented [28,29].…”

Section: Introductionmentioning

confidence: 97%

Microstructure evolution during severe plastic deformation

Divinski

Padmanabhan

Wilde

2011

Philosophical Magazine

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Nano- and micro-scale free volume in ultrafine grained Cu–1wt.%Pb alloy deformed by equal channel angular pressing

Cited by 87 publications

References 43 publications

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

Microstructure evolution during severe plastic deformation

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