Brittle transcrystalline and intercrystalline fracture in polycrystalline FCC-metal (iridium) / Panfilov P., Yermakov A. // Proceedings of the TMS Fall Meeting. - 2002. - V. , l. . - P. 229-234.

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Conference Paper
Abstract:
Fracture behavior of high pure polycrystalline iridium and iridium, where grain boundaries have been contaminated, is considered. Mixture of brittle transcrystalline and brittle intercrystalline fracture, where portion of the last depends on grain size, is the inherent fracture mode of this refractory fcc-metal (Tmelt=2443°C). 100% brittle intercrystalline fracture of fine grain aggregate means impurities induced fracture of iridium. At that high pure metal exhibits poor plasticity and brittle fracture under tensile stress only, while contaminated polycrystalline one is unworkable material. Another word "inherent brittleness" is specific property of iridium, which contrasts with brittle fracture behavior of crystal when it could not be deformable solid. Physical mechanisms of brittle transcrystalline fracture and grain boundaries brittleness in polycrystalline iridium are discussed.
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Index keywords:
Brittle fracture; Brittleness; Fracture mechanics; Grain boundaries; Grain size and shape; Plasticity; Polycrystalline materials; Tensile stress; Fracture behavior; Physical mechanisms; Iridium
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Affiliations Laboratory of Strength, Urals University, 620083 Ekaterinburg, Russian Federation
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Correspondence Address Panfilov, P.; Laboratory of Strength, Urals University, 620083 Ekaterinburg, Russian Federation
Editors Soboyejo W.O.Lewandowski J.J.Ritchie R.O.
Conference name Mechanisms and Mechanics of Fracture: The John Knott Symposium
Conference date 7 October 2002 through 10 October 2002
Conference location Columbus, OH
Conference code 60556
Language of Original Document English
Abbreviated Source Title Proc TMS Fall Meet
Source Scopus