Features of Deformation Behavior, Structure and Properties of TiNi Alloys Processed by Severe Rolling with Pulse Current

Abstract:

The possibility of applying electropulse to increase the deformability, nanostructure formation and functional property enhancement of hard deformed TiNi-based alloys during severe plastic deformation is examined. It is shown that electroplastic rolling significantly increases total strain to failure. The formation of nanocrystalline structures by rolling with current depends on the strain degree and pulse current density, which are critical parameters of the new method. For the first time display of the electroplastic effect in coarse-grained and nanostructured TiNi alloys is investigated. It has been shown that the amplitude and direction of stress jumps on tensile stress-strain curves depends on grain size and pulse current regimes. An increase in the recovery strain and superelasticity of material processed by rolling with current is demonstrated.

• Periodical: Materials Science Foundations (Volumes 81-82)
• Pages: 480-496
• DOI: https://doi.org/10.4028/www.scientific.net/MSFo.81-82.480
• Online since: March 2015
• Authors: Vladimir Stolyarov*, Anna Potapova
• Keywords: Deformability, Electroplastic Effect, Nanostructure, Pulse Current, Shape Memory Effects (SME)

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