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Title: Twinning-induced formation of nanostructure in commercial-purity titanium
Authors: Zherebtsov, S.
Dyakonov, G.
Klimova, М.
Salishchev, G.
Keywords: technique
metal science
low-temperature superplasticity
multidirectional forging
ultrafine grain structure
microstructure evolution
Issue Date: 2014
Citation: Twinning-induced formation of nanostructure in commercial-purity titanium / S. Zherebtsov [и др.] // Materials Science Forum. - 2014. - Vol.783-786.-P. 2732-2737.
Abstract: In the present work the influence of various parameters on formation of nano- or ultrafine-grained structure in commercial-purity titanium during large deformation was quantified using TEM and EBSD. The beneficial effect of twinning on the kinetics of microstructure refinement in titanium was revealed. It was shown that deformation twinning (and therefore nanostructure formation) can be intensified via decrease in temperature, increase in the initial grain size and decrease in the impurities content. The minimum grain size at which twinning can still operate in commercial-purity titanium was determined to be ~1μm. It was shown that rolling to a thickness strain of 93% at -196°C resulted in the formation of a microstructure with a grain/subgrain size ~80 nm
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