Mechanisms of plastic deformation in microcrystalline and nanocrystalline TiNi-based alloys |
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Authors: | N S Surikova A A Klopotov E A Korznikova |
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Affiliation: | 1.Institute of Strength Physics and Materials Science, Siberian Branch,Russian Academy of Sciences,Tomsk,Russia;2.Tomsk State University of Architecture and Building,Tomsk,Russia;3.Institute for Metal Superplasticity Problems,Russian Academy of Sciences,Ufa,Russia |
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Abstract: | Mechanisms of plastic deformation of a high-temperature B2 phase that act upon tension, compression, and high-pressure torsion in TiNi-based single crystals have been studied depending
on the crystal orientation. For the crystals with orientations located near the $
\bar 1
$
\bar 1
11] and $
\bar 1
$
\bar 1
12] poles in the standard stereographic triangle, multiple dislocation slip prevails upon both compression and tension. In
“hard” crystals with the deformation axis close to the 001] direction, in which the Schmid factors for dislocation slip are
close to zero, the main deformation mechanisms are the mechanical twinning in the B2 phase and the stress-assisted B2 → B19′ martensitic transformation. All the above listed mechanisms take part in the formation of the {111}〈hkl〉 texture. The mechanism of the change in the orientation of “hard” polycrystalline grains upon the formation of a nanocrystalline
and amorphous-crystalline state has been demonstrated on the example of the evolution of the structure of 001] crystals upon
severe plastic deformation in a Bridgman cell. |
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Keywords: | |
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