Effect of deviations of composition from the quasi-binary section TiNi-TiCu on structural and phase transformations in rapidly quenched alloys / Pushin A. V.,Popov A. A.,Pushin V. G. // PHYSICS OF METALS AND METALLOGRAPHY. - 2013. - V. 114, l. 8. - P. 692-702.

ISSN/EISSN:

0031-918X / нет данных

Type:

Article

Abstract:

Methods of X-ray diffraction, transmission and scanning electron microscopy, and selected-area electron diffraction (SAED) have been used to study the phase and elemental composition and structure of alloys close to the stoichiometric Ti(5)0Ni(25)Cu(25) alloy. Based on the method of rapid quenching of the melt (free-jet melt spinning), alloys of the quasi-binary TiNi-TiCu section have been prepared, which in the initial as-cast state exhibited the thermoelastic martensitic transformations B (2) a dagger{''} B (19) and related shape-memory effects. The chemical composition of the Ti50 + x Ni25Cu25 - x alloys was varied by changing titanium and copper concentrations within x a parts per thousand currency sign +/- 1 at \% (from Ti49Ni25Cu26 to Ti51Ni25Cu24). It has been established that quenching at a cooling rate equal to 10(6) K/s leads to the amorphization of all the alloys under consideration. Heating to 723 K and higher leads to the devitrification of the alloy with the formation of a nanocrystalline or submicrocrystalline structure of the B2 austenite. The mechanical properties of these alloys have been measured in the initial amorphous state and in the polycrystalline martensitic state. It has been shown that, depending on the extent of the deviations of the alloy composition from the stoichiometry, which cause the decomposition of the alloys in the process of nanocrystallization, regular changes are observed in their mechanical properties and in the shape-memory effects. The kinetics of the processes of the devitrification of the alloys, as well of the forward and reverse martensitic transformations, have been studied, their characteristic temperatures have been determined, and a diagram of the dependence of the characteristic temperatures on the chemical composition of the alloys has been constructed.

Author keywords:

Ti2NiCu-based alloys (Ti50Ni25Cu25); rapid quenching of alloys by free-jet melt spinning; nanocrystals; thermoelastic martensitic transformations; shape-memory effects MEMORY; MICROSTRUCTURE

DOI:

10.1134/S0031918X13060136

Web of Science ID:

ISI:000323277200007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	AUG
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	MEMORY; MICROSTRUCTURE
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	avpushin@rambler.ru pushin@imp.uran.ru
ResearcherID-Numbers	Popov, Artemiy/G-3947-2016 Vladimir, Pushin/J-4807-2013
ORCID-Numbers	Popov, Artemiy/0000-0001-6171-1701 Vladimir, Pushin/0000-0001-7569-0999
Funding-Acknowledgement	Presidium of the Russian Academy of Sciences {[}12-P-2-1060, 12-2-005-Arktika]; Russian Foundation for Basic Research {[}11-02-00021]
Funding-Text	This work was supported in part by the Presidium of the Russian Academy of Sciences (grant no. 12-P-2-1060, 12-2-005-Arktika) and by the Russian Foundation for Basic Research (project no. 11-02-00021).
Number-of-Cited-References	24
Usage-Count-Since-2013	15
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	203FR