Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111112
Title: Plastic Deformation of Polycrystalline Iridium at Room Temperature
Authors: Panfilov, P.
Yermakov, A.
Antonova, O. V.
Pilyugin, V. P.
Issue Date: 2009
Publisher: Johnson Matthey
Citation: Plastic Deformation of Polycrystalline Iridium at Room Temperature / P. Panfilov, A. Yermakov, O. V. Antonova et al. // Platinum Metals Review. — 2009. — Vol. 53. — Iss. 3. — P. 138-146.
Abstract: Defect structure and its relationship with deformation behaviour at room temperature of iridium, the sole refractory face centred cubic (f.c.c.) metal, are discussed. Small angle boundaries and pile-ups of curvilinear dislocation segments are the main features of dislocation structure in polycrystalline iridium at room temperature, while homogeneously distributed rectilinear dislocation segments were the main element of defect structure of iridium single crystals at the same conditions. Small angle boundaries and pile-ups of curvilinear dislocation segments are formed in iridium single crystals under mechanical treatment at elevated temperatures (> 800°C) only. The evolution of defect structure in polycrystalline iridium and other f.c.c. metals under room temperature deformation occurs by the same process: accumulation of dislocations in the matrix leads to the appearance of both new sub-grains and new grains up to the fine grain (nanocrystalline) structure. Neither single straight dislocations nor their pile-ups are observed in iridium at room temperature if small angle boundaries have been formed. This feature may be considered as the reason why polycrystalline iridium demonstrates advanced necking (high localised plasticity) and small total elongation.
Keywords: ANGLE BOUNDARIES
DEFORMATION BEHAVIOUR
DISLOCATION SEGMENTS
DISLOCATION STRUCTURES
ELEVATED TEMPERATURE
FACE-CENTRED CUBIC
FINE GRAINS
MATRIX
MECHANICAL TREATMENTS
NANOCRYSTALLINE
PILE-UPS
POLYCRYSTALLINE IRIDIUM
ROOM TEMPERATURE
TOTAL ELONGATIONS
CRYSTAL STRUCTURE
DEFECT STRUCTURES
DEFORMATION
DISLOCATIONS (CRYSTALS)
IRIDIUM
PILES
REFRACTORY METALS
SINGLE CRYSTALS
URI: http://hdl.handle.net/10995/111112
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 67749116140
ISSN: 1471-0676
metadata.dc.description.sponsorship: The authors would like to thank Professor David Lupton (W. C. Heraeus GmbH, Hanau, Germany) and Professor Easo George (The University of Tennessee, Knoxville, Tennessee, U.S.A.) for helpful discussions. This research was partially supported by the JSC Ekaterinburg NonFerrous Metals Processing Plant, the Ministry of Education and Science of the Russian Federation (Grant No. 2.2.2.2/5579) and the U.S. Civilian Research and Development Foundation (CRDF) (Grant No. RUXO-005-EK-06/BG7305).
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