Effect of annealing on percolating porosity in ultrafine-grained copper produced by equal channel angular pressing

Jens Ribbe; Guido Schmitz; Dmitriy Gunderov; Yuri Estrin; Yaron Amouyal; Gerhard Wilde; Sergiy V. Divinski

doi:https://doi.org/10.1016/j.actamat.2013.05.036

Effect of annealing on percolating porosity in ultrafine-grained copper produced by equal channel angular pressing

Jens Ribbe, Guido Schmitz, Dmitriy Gunderov, Yuri Estrin, Yaron Amouyal, Gerhard Wilde, Sergiy V. Divinski

Materials Science & Engineering

Technion - Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

Percolating porosity as a specific type of deformation-induced was discovered in ultrafine-grained (UFG) Cu produced by equal channel angular pressing (Ribbe et al., Phys Rev Lett 2009;102:165501). The stability of this defect type against annealing under various conditions is investigated for UFG Cu of different purity levels. The porosity is found to withstand the annealing treatments up to 1073 K for several hours in purified Ar atmosphere, despite significant microstructure transformation. Annealing at 1313 K in Ar removes the percolating porosity, as do relatively short heat treatments at 427 K in a hydrogen-containing atmosphere. Quasi-hydrostatic pressure applied at moderate temperatures, e.g. 1 GPa at 423 K, eliminates the percolating porosity, too. A model of porosity evolution, which accounts for the experimental findings, is suggested.

Original language	English
Pages (from-to)	5477-5486
Number of pages	10
Journal	Acta Materialia
Volume	61
Issue number	14
DOIs	https://doi.org/10.1016/j.actamat.2013.05.036
State	Published - Aug 2013

Keywords

Defects
Excess free volume
Grain boundary diffusion
Porosity
Severe plastic deformation

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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https://doi.org/10.1016/j.actamat.2013.05.036

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@article{f7916d0c43f046a4b4fa6465a51b0b69,

title = "Effect of annealing on percolating porosity in ultrafine-grained copper produced by equal channel angular pressing",

abstract = "Percolating porosity as a specific type of deformation-induced was discovered in ultrafine-grained (UFG) Cu produced by equal channel angular pressing (Ribbe et al., Phys Rev Lett 2009;102:165501). The stability of this defect type against annealing under various conditions is investigated for UFG Cu of different purity levels. The porosity is found to withstand the annealing treatments up to 1073 K for several hours in purified Ar atmosphere, despite significant microstructure transformation. Annealing at 1313 K in Ar removes the percolating porosity, as do relatively short heat treatments at 427 K in a hydrogen-containing atmosphere. Quasi-hydrostatic pressure applied at moderate temperatures, e.g. 1 GPa at 423 K, eliminates the percolating porosity, too. A model of porosity evolution, which accounts for the experimental findings, is suggested.",

keywords = "Defects, Excess free volume, Grain boundary diffusion, Porosity, Severe plastic deformation",

author = "Jens Ribbe and Guido Schmitz and Dmitriy Gunderov and Yuri Estrin and Yaron Amouyal and Gerhard Wilde and Divinski, {Sergiy V.}",

note = "Funding Information: This work was supported by Deutsche Forschungsgemeinschaft through research grants. One of the authors (Y.E.) would like to acknowledge profound and stimulating discussions of the stability of nanopores with Profs. G. Gottstein and L.S. Shvindlerman during his stay at RWTH Aachen, which was made possible through an Alexander von Humboldt Award. The authors are also grateful to Dr. Zuberova for her assistance with ECAP work. Useful exchanges of ideas with Profs. E. Rabkin, T. Lowe and R. Lapovok are gratefully acknowledged.",

year = "2013",

month = aug,

doi = "https://doi.org/10.1016/j.actamat.2013.05.036",

language = "الإنجليزيّة",

volume = "61",

pages = "5477--5486",

number = "14",

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TY - JOUR

T1 - Effect of annealing on percolating porosity in ultrafine-grained copper produced by equal channel angular pressing

AU - Ribbe, Jens

AU - Schmitz, Guido

AU - Gunderov, Dmitriy

AU - Estrin, Yuri

AU - Amouyal, Yaron

AU - Wilde, Gerhard

AU - Divinski, Sergiy V.

N1 - Funding Information: This work was supported by Deutsche Forschungsgemeinschaft through research grants. One of the authors (Y.E.) would like to acknowledge profound and stimulating discussions of the stability of nanopores with Profs. G. Gottstein and L.S. Shvindlerman during his stay at RWTH Aachen, which was made possible through an Alexander von Humboldt Award. The authors are also grateful to Dr. Zuberova for her assistance with ECAP work. Useful exchanges of ideas with Profs. E. Rabkin, T. Lowe and R. Lapovok are gratefully acknowledged.

PY - 2013/8

Y1 - 2013/8

N2 - Percolating porosity as a specific type of deformation-induced was discovered in ultrafine-grained (UFG) Cu produced by equal channel angular pressing (Ribbe et al., Phys Rev Lett 2009;102:165501). The stability of this defect type against annealing under various conditions is investigated for UFG Cu of different purity levels. The porosity is found to withstand the annealing treatments up to 1073 K for several hours in purified Ar atmosphere, despite significant microstructure transformation. Annealing at 1313 K in Ar removes the percolating porosity, as do relatively short heat treatments at 427 K in a hydrogen-containing atmosphere. Quasi-hydrostatic pressure applied at moderate temperatures, e.g. 1 GPa at 423 K, eliminates the percolating porosity, too. A model of porosity evolution, which accounts for the experimental findings, is suggested.

AB - Percolating porosity as a specific type of deformation-induced was discovered in ultrafine-grained (UFG) Cu produced by equal channel angular pressing (Ribbe et al., Phys Rev Lett 2009;102:165501). The stability of this defect type against annealing under various conditions is investigated for UFG Cu of different purity levels. The porosity is found to withstand the annealing treatments up to 1073 K for several hours in purified Ar atmosphere, despite significant microstructure transformation. Annealing at 1313 K in Ar removes the percolating porosity, as do relatively short heat treatments at 427 K in a hydrogen-containing atmosphere. Quasi-hydrostatic pressure applied at moderate temperatures, e.g. 1 GPa at 423 K, eliminates the percolating porosity, too. A model of porosity evolution, which accounts for the experimental findings, is suggested.

KW - Defects

KW - Excess free volume

KW - Grain boundary diffusion

KW - Porosity

KW - Severe plastic deformation

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U2 - https://doi.org/10.1016/j.actamat.2013.05.036

DO - https://doi.org/10.1016/j.actamat.2013.05.036

M3 - مقالة

SN - 1359-6454

VL - 61

SP - 5477

EP - 5486

JO - Acta Materialia

JF - Acta Materialia

IS - 14

ER -

Effect of annealing on percolating porosity in ultrafine-grained copper produced by equal channel angular pressing

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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