Abstract
Systematic experimental study have been carried-out of the commercially pure Ti plasticity under uniaxial tension at 300, 77 and 4,2 Κ, in the nanostructured states processed by equal channel angular pressing (as well as in the coarse-grained state) with the aim to find explanation of pure Ti increased plasticity at 77 K. Regularities of changing of the ultimate uniform plastic deformation of Ti under cooling below ambient temperature in dependence of the average grain size and on the oxygen concentration in the initial material have been established. The hypothesis is proposed and approved that physical nature of the increased plasticity of nanostructured and polycrystalline Ti at 77 Κis caused by a stimulating influence of a thermal anisotropy internal stresses (TAIS) upon mobile dislocation multiplication by the double cross-slip in the large grains and upon nucleation of mechanical twins.
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Bengus, V. et al. (2006). Nanostructured and Polycrystalline Ti Anomalies of Low Temperature Plasticity. In: Zhu, Y.T., Varyukhin, V. (eds) Nanostructured Materials by High-Pressure Severe Plastic Deformation. NATO Science Series, vol 212. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3923-9_7
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DOI: https://doi.org/10.1007/1-4020-3923-9_7
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-3921-8
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