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The structure and mechanical properties of a large-size semiproduct from alloy VST5553 treated in the BASCA mode (beta annealed, slow cooled, aged) are studied by testing for impact bending and delayed fracture. The microstructures and fracture surfaces of specimens are investigated. To intensity the processes of decomposition of the β-phase in near-boundary regions an additional heat treatment including...
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...
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