Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/27072
Title: Effect of heat treatment on structural and phase transformations in the Ti49.5Ni50.5 alloy amorphized by high-pressure torsion
Authors: Pushin, V. G.
Kuranova, N. N.
Kourov, N. I.
Valiev, R. Z.
Korolev, A. V.
Makarov, V. V.
Pushin, A. V.
Uksusnikov, A. N.
Issue Date: 2013
Citation: Effect of heat treatment on structural and phase transformations in the Ti49.5Ni50.5 alloy amorphized by high-pressure torsion / V. G. Pushin, N. N. Kuranova, N. I. Kourov [et al.] // Physics of Metals and Metallography. — 2013. — Vol. 114. — № 6. — P. 488-502.
Abstract: Results are presented for a study of the structural and phase transformations that occur in the titanium-nickelide shape-memory alloy Ti 49.5Ni50.5 subjected to heat treatment after deformation-induced amorphization by megaplastic high-pressure torsion (HPT) using five or ten revolutions of Bridgman anvils. The investigations were performed using transmission and scanning electron microscopy, X-ray diffraction, and measurements of the temperature dependences of electrical resistivity and magnetic susceptibility. It has been established that the crystallization of the alloy already occurs upon low-temperature treatment, beginning with ∼500 K. The evolution of the structure and the stage character of the development of crystallization and recrystallization processes depending on temperature have been determined. It has been shown that the annealing of the amorphized alloy makes it possible to obtain highly homogeneous nanostructured, submicrocrystalline, or bimodal states in the B2 austenite. A complete diagram of thermoelastic martensitic transformations of the B2 austenite has been constructed in the region from a nanostructured to a conventional polycrystalline state (with a grain size of 20-50 μm). The effect of size on the stabilization of austenite has been revealed and its specific features have been studied for the B2 → R and B2(R) → B19′ martensitic transformations depending on the structural state of the alloy. © 2013 Pleiades Publishing, Ltd.
Keywords: MARTENSITIC TRANSFORMATIONS
SHAPE-MEMORY EFFECT
STRUCTURAL AND PHASE TRANSFORMATIONS
TITANIUM NICKELIDE (TINI)
EFFECT OF HEAT TREATMENTS
HIGH PRESSURE TORSIONS
POLYCRYSTALLINE STATE
RECRYSTALLIZATION PROCESS
SUBMICROCRYSTALLINE
TEMPERATURE DEPENDENCE
THERMOELASTIC MARTENSITIC TRANSFORMATIONS
TITANIUM NICKELIDE
ALLOYS
AUSTENITE
HEAT TREATMENT
MAGNETIC SUSCEPTIBILITY
MARTENSITIC TRANSFORMATIONS
NICKEL
SCANNING ELECTRON MICROSCOPY
SHAPE MEMORY EFFECT
TITANIUM
TORSIONAL STRESS
X RAY DIFFRACTION
CERIUM ALLOYS
URI: http://hdl.handle.net/10995/27072
SCOPUS ID: 84879485909
WOS ID: 000320406400005
PURE ID: 906769
ISSN: 0031-918X
1555-6190
DOI: 10.1134/S0031918X13060124
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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