Effect of high-rate annealing on microstructure, martensitic transformation and shape memory behavior of TiNiCu melt-spun ribbons

Shelyakov, A. V.; Sitnikov, Nikolay; Khabibullina, I. A.; Tabachkova, N. Yu.; Fominski, V. Yu.; Andreev, Nikolay

doi:10.1016/j.matlet.2019.03.140

Cited by 22 publications

(12 citation statements)

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“…which is in agreement with earlier data [22,23,27]. One can however note that the intensity of the B19 phase reflections in the diffraction patterns of the dynamically crystallized specimens both in the initial and in the activated amorphous states is slightly higher as compared with that of the isothermally crystallized specimens (Figure 6).…”

Section: Resultssupporting

confidence: 92%

“…X-ray study of the specimen structure showed that all the specimens after isothermal and electropulse crystallization have the B19 martensitic structure at room temperature which is in agreement with earlier data [22,23,27]. One can however note that the intensity of the B19 phase reflections in the diffraction patterns of the dynamically crystallized specimens both in the initial and in the activated amorphous states is slightly higher as compared with that of the isothermally crystallized specimens (Figure 6).…”

Section: Resultssupporting

confidence: 90%

“…Nevertheless it was recently showed [27] that after high-rate crystallization of amorphous TiNi-TiCu alloys with a copper content of 25 to 38 at.% by a single 10 ms electric current pulse, in contradiction with the above line of reasoning, the alloy structure is not refined in comparison with isothermal treatment results, but on the contrary the average grain size increases significantly. The largest grain size was obtained in the alloy containing 38 at.% copper which had the greatest amorphization degree at the same quenching speed of 10 6 K/s although, in accordance with the reasons presented above, this factor should favor the formation of the finest structure.…”

Section: Introductionmentioning

confidence: 88%

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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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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 88%

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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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“…Фазовые переходы, критические и нелинейные явления в конденсированных средах" изотермической кристаллизации приводят к образованию хрупких фаз Ti−Cu. В работах [12,13] было показано, что экстремальное воздействие в виде электроимпульсной обработки со временем воздействия 10 ms и менее по отношению к аморфным сплавам квазибинарной системы TiNi−TiCu с содержанием меди 25−38 at.% позволяет получить материалы со структурой, в которой наблюдается эффект памяти формы. Было продемонстрировано, что экстремальные воздействия на твердые тела являются ключом к получению новых структурных состояний.…”

Section: конференция "unclassified

“…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

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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Study of the Effect of Tensile Stress During Electric Pulse Treatment of Amorphous Rapidly Hardened Ti50Ni25Cu25 Alloys on Crystal Structure Formation

et al. 2021

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Effect of high-rate annealing on microstructure, martensitic transformation and shape memory behavior of TiNiCu melt-spun ribbons

Cited by 22 publications

References 10 publications

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

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

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

Study of the Effect of Tensile Stress During Electric Pulse Treatment of Amorphous Rapidly Hardened Ti50Ni25Cu25 Alloys on Crystal Structure Formation

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