Estimation of Fracture Toughness of Small-Sized Ultrafine-Grained Specimens

Autor:	Е. Е. Deryugin, B. I. Suvorov
Rok vydání:	2015
Předmět:	Fracture toughness Materials science Lattice (order) Alloy engineering Nucleation General Physics and Astronomy Titanium alloy Fracture mechanics engineering.material Severe plastic deformation Composite material Forging
Zdroj:	Russian Physics Journal. 58:791-796
ISSN:	1573-9228 1064-8887
DOI:	10.1007/s11182-015-0570-1
Popis:	The results obtained from measurements of the crack resistance of a VT6 alloy (Ti–6.46Al–3.84V in wt.%) produced by refining coarse-crystalline structure down to an ultrafine-grained state, using a triaxial forging technique, are presented. The specific fracture energy γc is calculated by means of a new procedure developed for small-sized chevron-notched specimens. Severe plastic deformation is shown to cause a substantial reduction in γc at room temperature. Fracture surface structure found in the ultrafine-grained alloy under study contains local zones of a severely deformed material characterized by high pore concentration. This type of structure cannot be formed solely by crystallographic shearing along densely packed lattice planes. This is evidence for a significant role of rotation deformation modes in crack nucleation and growth on different structural scales of the material.
Databáze:	OpenAIRE
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