Structural anisotropy in equal-channel angular extruded nickel revealed by dilatometric study of excess volume

Jaromir Kotzurek; Wolfgang Sprengel; Maciej Krystian; Sanja Simic; Peter Pölt; Anton Hohenwarter; Reinhard Pippan; Roland Würschum

doi:10.3139/146.111463

Structural anisotropy in equal-channel angular extruded nickel revealed by dilatometric study of excess volume

Jaromir Kotzurek
, Wolfgang Sprengel
, Maciej Krystian
, Sanja Simic
, Peter Pölt
, Anton Hohenwarter
, Reinhard Pippan
, Roland Würschum

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

Abstract

Structural anisotropy and excess volume in ultra-finegrained high-purity nickel prepared by equal-channel angu-lar pressing (ECAP) is studied by means of dilatometry andcompared with the processing route of high-pressure tor-sion. Both routes exhibit qualitatively similar three-stagebehavior in length change upon defect annealing with acharacteristic dependence on the measuring direction re-lated to the deformation axes. Taking into account shapeanisotropy of the crystallites, the length change in variousdirections can be quantitatively analyzed yielding directaccess to the concentration of deformation-induced latticevacancies, the vacancy relaxation, and the grain boundaryexpansion. The routes A12 and BC12 of ECAP are com-pared.

Original language	English
Pages (from-to)	81-88
Journal	International Journal of Materials Research
Volume	108
DOIs	https://doi.org/10.3139/146.111463
Publication status	Published - 2017

Fields of Expertise

Advanced Materials Science

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10.3139/146.111463Licence: CC BY 4.0

1 Active
2 Finished

Atomic defects in metals and metals oxides
Resch, L. (Contact person), Würschum, R. (Contact person), Sprengel, W. (Project manager on research unit) & Klinser, G. (Attendee / Assistant)
1/01/12 → 31/12/26
Project: Research project
FWF- Defekte i. ultrafeinkr. Met - Defects and structural anisotropy in ultrafine-crystalline metals
Würschum, R. (Project manager), Kotzurek, J. (Other function) & Sprengel, W. (Attendee / Assistant)
1/05/13 → 30/04/17
Project: Research project
Transformation and diffusion processes in materials
Sprengel, W. (Contact person) & Würschum, R. (Contact person)
1/01/13 → 31/12/24
Project: Research area

Cite this

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title = "Structural anisotropy in equal-channel angular extruded nickel revealed by dilatometric study of excess volume",

abstract = "Structural anisotropy and excess volume in ultra-finegrained high-purity nickel prepared by equal-channel angu-lar pressing (ECAP) is studied by means of dilatometry andcompared with the processing route of high-pressure tor-sion. Both routes exhibit qualitatively similar three-stagebehavior in length change upon defect annealing with acharacteristic dependence on the measuring direction re-lated to the deformation axes. Taking into account shapeanisotropy of the crystallites, the length change in variousdirections can be quantitatively analyzed yielding directaccess to the concentration of deformation-induced latticevacancies, the vacancy relaxation, and the grain boundaryexpansion. The routes A12 and BC12 of ECAP are com-pared.",

author = "Jaromir Kotzurek and Wolfgang Sprengel and Maciej Krystian and Sanja Simic and Peter P{\"o}lt and Anton Hohenwarter and Reinhard Pippan and Roland W{\"u}rschum",

year = "2017",

doi = "10.3139/146.111463",

language = "English",

volume = "108",

pages = "81--88",

journal = "International Journal of Materials Research ",

issn = "2195-8556",

publisher = "De Gruyter",

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TY - JOUR

T1 - Structural anisotropy in equal-channel angular extruded nickel revealed by dilatometric study of excess volume

AU - Kotzurek, Jaromir

AU - Sprengel, Wolfgang

AU - Krystian, Maciej

AU - Simic, Sanja

AU - Pölt, Peter

AU - Hohenwarter, Anton

AU - Pippan, Reinhard

AU - Würschum, Roland

PY - 2017

Y1 - 2017

N2 - Structural anisotropy and excess volume in ultra-finegrained high-purity nickel prepared by equal-channel angu-lar pressing (ECAP) is studied by means of dilatometry andcompared with the processing route of high-pressure tor-sion. Both routes exhibit qualitatively similar three-stagebehavior in length change upon defect annealing with acharacteristic dependence on the measuring direction re-lated to the deformation axes. Taking into account shapeanisotropy of the crystallites, the length change in variousdirections can be quantitatively analyzed yielding directaccess to the concentration of deformation-induced latticevacancies, the vacancy relaxation, and the grain boundaryexpansion. The routes A12 and BC12 of ECAP are com-pared.

AB - Structural anisotropy and excess volume in ultra-finegrained high-purity nickel prepared by equal-channel angu-lar pressing (ECAP) is studied by means of dilatometry andcompared with the processing route of high-pressure tor-sion. Both routes exhibit qualitatively similar three-stagebehavior in length change upon defect annealing with acharacteristic dependence on the measuring direction re-lated to the deformation axes. Taking into account shapeanisotropy of the crystallites, the length change in variousdirections can be quantitatively analyzed yielding directaccess to the concentration of deformation-induced latticevacancies, the vacancy relaxation, and the grain boundaryexpansion. The routes A12 and BC12 of ECAP are com-pared.

U2 - 10.3139/146.111463

DO - 10.3139/146.111463

M3 - Article

SN - 2195-8556

VL - 108

SP - 81

EP - 88

JO - International Journal of Materials Research

JF - International Journal of Materials Research

ER -

Structural anisotropy in equal-channel angular extruded nickel revealed by dilatometric study of excess volume

Abstract

Fields of Expertise

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Projects

Atomic defects in metals and metals oxides

FWF- Defekte i. ultrafeinkr. Met - Defects and structural anisotropy in ultrafine-crystalline metals

Transformation and diffusion processes in materials

Cite this