Microstructures and shape memory characteristics of a Ti–20Ni–30Cu (at.%) alloy strip fabricated by the melt overflow process

Kang, Shin-Min; Lim, Y.G.; Lee, Yong-hee; Moon, Hyo-jung; Kim, Yeon‐wook; Nam, Tae-Hyun

doi:10.1016/j.scriptamat.2009.09.034

Cited by 27 publications

(11 citation statements)

References 10 publications

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“…In NiTi25Cu (Fig. 2d and e), no second phase, such as TiCu, was observed in our samples, even though the Cu content of the alloy exceeds the Cu solubility limit by far, while it was observed near grain boundaries in conventional casting [5]. In addition, some regions of NiTi25Cu ribbons clearly consist of twins such as the marked region in Fig.…”

Section: Etchants and Microstructuresmentioning

confidence: 58%

“…In order to overcome the brittleness of the alloys, many metallurgical processing technologies have been examined, including powder metallurgy and rapid solidification [5]. The melt-spinning process could be one of the best alternatives for fabricating NiTiCu alloys with high Cu content because it enables ribbons to be obtained directly from the molten metal, and the high solidification rate suppresses the formation of TiCu particles.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, mechanical and functional properties of NiTi-based shape memory ribbons

Mehrabi

Brunčko

Kneissl

2012

Journal of Alloys and Compounds

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Section: Etchants and Microstructuresmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical and functional properties of NiTi-based shape memory ribbons

Mehrabi

Brunčko

Kneissl

2012

Journal of Alloys and Compounds

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“…При этом было установлено, что наилучшими характеристиками обладают сплавы TiNiCu, кристаллизованные из аморфного состояния. Аморфизация достигается в сплавах с высоким содержанием меди (более 20 at.%) при скорости охлаждения расплава около 10 6 K/s [4,5], что может быть реализовано при использовании наиболее распространенного в настоящее время метода изготовления аморфных металлических сплавов путем спиннингования расплава на внешней поверхности вращающегося диска, где он затвердевает в виде тонкой ленты, которая затем отделяется от диска под действием центробежной силы [6,7]. При этом установлено, что содержание меди существенно влияет на характер кристаллизации быстрозакаленных аморфных сплавов TiNiCu [8,9].…”

Section: Introductionunclassified

Особенности кристаллизации аморфных сплавов TiNiCu с высоким содержанием меди

Шеляков¹,

Ситников²,

Хабибуллина³

et al. 2020

Физика Твердого Тела

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Alloys of the quasi-binary TiNi – TiCu system with a copper content of 25, 30, 35, and 40 at. % were obtained by planar flow casting technique at a cooling rate of 10^6 K/s in the form of ribbons 30–50 μm thick and 10–20 mm wide. The structure and phase transformations in the alloys were studied using electron microscopy, X-ray diffraction analysis, and differential scanning calorimetry. It was found that in the initial state, the alloys with 25 and 30 at.% Cu have an amorphous-crystalline structure, undergoing a one-stage polymorphic crystallization of the amorphous state on heating in a calorimeter with the formation of austenite B2 phase, which on cooling to room temperature proceeds to orthorhombic B19 phase due to the martensitic transformation. It is shown that the alloys with 35 and 40 at.% Cu at quenching become amorphous, and upon heating, two-stage crystallization occurs (primary and eutectic) with the formation of a two-phase structure - the tetragonal B11 (TiCu) phase with a small fraction of B2 phase. Moreover, an increase in the copper content leads to a decrease in the onset temperature of crystallization.

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“…However, the TiNiCu alloys with high copper content are brittle because of the TiCu phase formation near grain boundaries and, therefore, cannot be deformed into wire or ribbon upon hot or cold processing [6,7], which is necessary for the manufacture of thermal actuators. One of the best alternatives for overcoming the brittleness of the alloys is the method of rapid melt quenching [8,9,10]. Such extreme action allows one to produce thin ribbons directly from the molten metal, and a high solidification rate suppresses the formation of TiCu particles.…”

Section: Introductionmentioning

confidence: 99%

Crystallization Features of Amorphous Rapidly Quenched High Cu Content TiNiCu Alloys upon Severe Plastic Deformation

et al. 2019

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In recent years, the methods of severe plastic deformation and rapid melt quenching have proven to be an effective tool for the formation of the unique properties of materials. The effect of high-pressure torsion (HPT) on the structure of the amorphous alloys of the quasi-binary TiNi–TiCu system with a copper content of more than 30 at.% produced by melt spinning technique has been analyzed using the methods of scanning electron microscopy, X-ray diffraction analysis, and differential scanning calorimetry (DSC). The structure examinations have shown that the HPT of the alloys with a Cu content ranging from 30 to 40 at.% leads to nanocrystallization from the amorphous state. An increase in the degree of deformation leads to a substantial change in the character of the crystallization reflected by the DSC curves of the alloys under study. The alloys containing less than 34 at.% Cu exhibit crystallization peak splitting, whereas the alloys containing more than 34 at.% Cu exhibit a third peak at lower temperatures. The latter effect suggests the formation of regions of possible low-temperature crystallization. It has been established that the HPT causes a significant decrease in the thermal effect of crystallization upon heating of the alloys with a high copper content relative to that of the initial amorphous melt quenched state.

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Microstructures and shape memory characteristics of a Ti–20Ni–30Cu (at.%) alloy strip fabricated by the melt overflow process

Cited by 27 publications

References 10 publications

Microstructure, mechanical and functional properties of NiTi-based shape memory ribbons

Microstructure, mechanical and functional properties of NiTi-based shape memory ribbons

Особенности кристаллизации аморфных сплавов TiNiCu с высоким содержанием меди

Crystallization Features of Amorphous Rapidly Quenched High Cu Content TiNiCu Alloys upon Severe Plastic Deformation

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