Plastic Deformation of Polycrystalline Iridium at Room Temperature UNIQUE PROPERTIES OF IRIDIUM, THE SOLE REFRACTORY FACE CENTRED CUBIC METAL / Panfilov Peter,Yermakov Alexander,Antonova Olga V.,Pilyugin Vitalii P. // PLATINUM METALS REVIEW. - 2009. - V. 53, l. 3. - P. 138-146.

ISSN/EISSN:

1471-0676 / нет данных

Type:

Article

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 degrees 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.

Author keywords:

BRITTLE-FRACTURE; SINGLE-CRYSTALS; GRAIN-BOUNDARIES; BEHAVIOR; TENSION; FCC

DOI:

10.1595/147106709X463318

Web of Science ID:

ISI:000268118400004

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL
Publisher	JOHNSON MATTHEY PUBL LTD CO
Address	HATTON GARDEN, LONDON EC1N 8EE, ENGLAND
Language	English
Keywords-Plus	BRITTLE-FRACTURE; SINGLE-CRYSTALS; GRAIN-BOUNDARIES; BEHAVIOR; TENSION; FCC
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	peter.panfilov@usu.ru
ResearcherID-Numbers	Antonova, Olga/K-4548-2013 Panfilov, Peter/B-4027-2014 Pilyugin, Vitaly/K-6525-2013
ORCID-Numbers	Antonova, Olga/0000-0002-0908-0575 Panfilov, Peter/0000-0001-9068-049X Pilyugin, Vitaly/0000-0002-5150-6605
Funding-Acknowledgement	JSC Ekaterinburg NonFerrous Metals Processing Plant; Ministry of Education and Science of the Russian Federation {[}2.2.2.2/5579]; U. S. Civilian Research and Development Foundation (CRDF) {[}RUXO-005-EK-06/BG7305]
Funding-Text	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).
Number-of-Cited-References	41
Usage-Count-Since-2013	6
Journal-ISO	Platin. Met. Rev.
Doc-Delivery-Number	472GM