The effect of copper on structure of TiNiCu melt-spun ribbons

Sitnikov, Nikolay; Shelyakov, A. V.; Ризаханов, Р. Н.; Mitina, N. A.; Khabibullina, I. A.

doi:10.1016/j.matpr.2017.04.051

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…The finer (nanosized) subsurface structure formed upon shear deformation of the amorphous phase is bounded by extended columnar crystals formed across the deformation axis upon HPT (Figure 7c,d). A slightly different picture observed in the alloys with a copper content of 34 at.% and higher (Figure 7e,f) is most likely due to the predominant formation of Ti–Cu phases in the ribbons [15].…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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“…В настоящей работе объектом исследования являлись сплавы квазибинарной системы TiNi−TiCu с содержанием титана 50 at.% и содержанием меди 30 at.%, которые были изготовлены методом сверхбыстрой закалки из расплава [10][11][12][13][14]. Предварительно слитки сплавов необходимой композиции были приготовлены из сверхчистых металлов (электродный никель Н0, бескислородная медь М0, йодидный титан H 1 min ) с шестикратной переплавкой в дуговой печи в атмосфере аргона для обеспечения однородности.…”

Section: материалы и методы исследованияunclassified

“…Для большинства применений требуются тонкомерные материалы с эффектом памяти формы, обладающие узким гистерезисом фазовых мартенситных превращений в области комнатных температур [5][6][7][8]. Одним из вариантов материалов с эффектом памяти формы, удовлетворя-ющих этим требованиям, являются сплавы квазибинарной интерметаллической системы TiNi−TiCu [8][9][10]. Однако данные сплавы с высоким содержанием меди (более 20 ат.%) при получении стандартными методами в кристаллическом состоянии являются хрупкими, так как в них образуются фазы Ti−Cu, которые охрупчивают весь материал и препятствуют протеканию в них мартенситных превращений, ответственных за проявление эффектов памяти формы [10].…”

Section: Introductionunclassified

“…Одним из вариантов материалов с эффектом памяти формы, удовлетворя-ющих этим требованиям, являются сплавы квазибинарной интерметаллической системы TiNi−TiCu [8][9][10]. Однако данные сплавы с высоким содержанием меди (более 20 ат.%) при получении стандартными методами в кристаллическом состоянии являются хрупкими, так как в них образуются фазы Ti−Cu, которые охрупчивают весь материал и препятствуют протеканию в них мартенситных превращений, ответственных за проявление эффектов памяти формы [10]. Одним из перспективных способов получения " работоспособных" сплавов с эффектом памяти формы на основе квазибинарной системы TiNi−TiCu -сверхбыстрая закалка из жидкого состояния [11].…”

Section: Introductionunclassified

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Особенности кристаллизации быстрозакаленных аморфных сплавов Ti-=SUB=-50-=/SUB=-Ni-=SUB=-20-=/SUB=-Cu-=SUB=-30-=/SUB=- после кручения под высоким давлением

Sitnikov¹,

Шеляков²,

Сундеев³

et al. 2020

Физика Твердого Тела

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There is a splitting of crystallization peaks in the region of lower temperatures, that is, regions are formed in which low-temperature crystallization is possible. It was found that HPC causes a decrease in the thermal effect of crystallization upon heating alloys with a high copper content relative to the initial amorphous state obtained after quenching from the melt. After DSC crystallization in the alloy, a structure was formed that is characterized by inhomogeneity in the cross section of the sample with stratification according to the size of the structural elements. In the regions of partial nanocrystallization of the amorphous state after crystallization, a finer-grained structure was formed than in the main bulk of the sample. The obtained results convincingly demonstrate the influence of HPC on the formation of a crystalline structure from amorphous Ti50Ni20Cu30 alloys.

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“…One promising variant of a material which meets the above requirements are alloys of the TiNi-TiCu quasibinary intermetallic system with a copper content of above 10 at.% [9][10][11][12]. However the production of these alloys using conventional metallurgical processes of melting or sintering may cause not only the formation of detrimental Ti-Cu phases which hinder the martensitic transformation (MT) and, as a consequence, reduce shape memory strain, but also embrittle the alloys [13][14][15]. This problem can be solved Metals 2021, 11, 1528 2 of 15 using the technology of rapid quenching from liquid state which allows obtaining TiNi-TiCu system alloys with a high Cu content in the form of thin ribbons with a single-phase composition and a homogeneous structure [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of External Impacts on the Structure and Martensitic Transformation of Rapidly Quenched TiNiCu Alloys

Shelyakov

Sitnikov

Zaletova

et al. 2021

Metals

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TiNi-TiCu quasibinary system alloys with a high Cu content produced by rapid quenching from liquid state in the form of thin amorphous ribbons exhibit pronounced shape memory effect after crystallization and are promising materials for miniaturized and fast operating devices. There is currently no complete clarity of the mechanisms of structure formation during crystallization from the amorphous state that determine the structure-sensitive properties of these alloys. This work deals with the effect of the initial amorphous state structure and crystallization method of the alloys on their structure and phase transformations. To this end the alloy containing 30 at.% Cu was subjected to thermal and mechanical impact in the amorphous state and crystallized using isothermal or electropulse treatment. We show that after all types of treatment in the amorphous state the structure of the alloy remains almost completely amorphous but the characteristic temperatures and enthalpy of crystallization become slightly lower. Isothermal crystallization of alloy specimens produces a submicrocrystalline structure with an average grain size in the 0.4–1.0 μm range whereas electropulse crystallization generates a bimorphic structure consisting of large 4–6 μm grains and 2–3 μm high columnar crystals in the vicinity of the surface. The grains have nanosized plate-like and subgrain structures. The largest grains are observed in thermally activated samples, meanwhile, mechanical impact in the amorphous state leads to the formation of equiaxed finer grains with a less defective subgrain structure and to the shift of the temperature range of the martensitic transformation toward lower temperatures.

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The effect of copper on structure of TiNiCu melt-spun ribbons

Cited by 15 publications

References 11 publications

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

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

Особенности кристаллизации быстрозакаленных аморфных сплавов Ti-=SUB=-50-=/SUB=-Ni-=SUB=-20-=/SUB=-Cu-=SUB=-30-=/SUB=- после кручения под высоким давлением

Effect of External Impacts on the Structure and Martensitic Transformation of Rapidly Quenched TiNiCu Alloys

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