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ArticleName Influence of Cross Rolling on the Structure and Properties of a TiNi Powder Alloy. Part 2
DOI 10.17580/tsm.2018.12.11
ArticleAuthor Markova G. V., Kasimtsev A. V., Volodko S. S., Alimov I. A.

Tula State University, Tula, Russia:

G. V. Markova, Head of the Chair of Physics of Metals and Materials Science, e-mail:

S. S. Volodko, Post-Graduate Student of the Chair of Physics of Metals and Materials Science, e-mail:
I. A. Alimov, Master’s Student of the Chair of Physics of Metals and Materials Science, e-mail:

LLC Metsintez, Tula, Russia:

A. V. Kasimtsev, Director, e-mail:


The authors studied the structure, a phase composition, mechanical and functional properties of a TiNi binary powder alloy (Ni = 55.5% (wt.)) after cross rolling at 900 oC with a degree of true strain of ε = 1.5. It is shown that after cross rolling at ε = 1.5 the structure contained R-martensite amounting to 5% or less. Due to lower rolling temperature, the dynamic recrystallization develops in some volume, and only a share of grains is in a polygonized and recrystallized state. The average grain size is dav = 34±2 μm, which is significantly lower than after a preceding deformation stage (ε = 0.8, dav = 64 ± 2 μm). Variations in a grain size occur in center and surface layers of rolled rods. However, such variations in a grain size do not influence microhardness across the sample section. As a result of the deformation at ε = 1.5, axial porosity decreases, entailing an increase in the alloy density up to 6.4 g/cm3. The decreased axial porosity and grain refinement contributed to an increase in ductility up to a required level (δ >10%). Thus, a set of mechanical properties of TiNi after cross rolling at a strain degree of ε = 1.5 satisfies requirements of specifications TU 1-809-394–84 for alloy grade TN1. It is shown that after rolling a TiNi powder alloy is characterized by its high damping capacity in a temperature range of a martensite transformation. When carrying out tests, this alloy in austenite state shows superelasticity, while during tests in martensite-austenite state — superelasticity and shape memory effect. The studies on the effect of preliminary torsional deformation on shape memory properties showed that the shape of wire samples was fully restored up to γtor = 14%, then an unrestored part of deformation occurs due to an unreversible sliding effect.

keywords Rolling, TiNi, shape memory effect, mechanical spectroscopy, internal friction

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