On brittle fracture in polycrystalline iridium / Panfilov P,Yermakov A // JOURNAL OF MATERIALS SCIENCE. - 2004. - V. 39, l. 14. - P. 4543-4552.

ISSN/EISSN:

0022-2461 / нет данных

Type:

Article

Abstract:

The brittle intercrystalline fracture (BIF) in iridium and low plasticity of this refractory fcc-metal in polycrystalline state for wide temperature range, give occasion to supposition that a metal having fcc lattice can be brittle substance like silicon due to specific features of interatomic bonds. On the other hand, experience has shown that such behavior of fcc-metal should be impurity induced effect. High plasticity of iridium single crystals ( by means of octahedral slip), which however cleave under tension, does not support idea on ``classic{''} inherent brittleness of this metal. High sensibility of its mechanical properties to impurities (10 ppm is critical level for carbon!) has been severe restriction for experiments aimed to searching of inherent fracture mode for polycrystalline iridium. In present paper fracture behavior of high purity polycrystalline iridium and iridium, where grain boundaries (GBs) have been contaminated, are considered. Fine grained impurity-free metal exhibits 100\% brittle transcrystalline fracture (BTF) and cracked GBs on the fracture surface and this is an inherent fracture mode of polycrystalline iridium. Re-crystallization in vacuum leads to appearance of BIF regions, whose total square can reach 100\% of the fracture surface in coarse grain aggregates. Contaminated iridium mainly fails on grain boundaries, at that portion of BIF on the fracture surface (50 divided by 100\%) does not depend on grain size. (C) 2004 Kluwer Academic Publishers.

Author keywords:

SINGLE-CRYSTALS; MECHANICAL-PROPERTIES

DOI:

10.1023/B:JMSC.0000034148.0338

Web of Science ID:

ISI:000222473300014

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL 15
Publisher	KLUWER ACADEMIC PUBL
Address	VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Language	English
Keywords-Plus	SINGLE-CRYSTALS; MECHANICAL-PROPERTIES
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Multidisciplinary
Author-Email	peter.panfilov@usu.ru
ResearcherID-Numbers	Panfilov, Peter/B-4027-2014
ORCID-Numbers	Panfilov, Peter/0000-0001-9068-049X
Number-of-Cited-References	26
Usage-Count-Since-2013	11
Journal-ISO	J. Mater. Sci.
Doc-Delivery-Number	835HM