Investigation of the influence of the parameters of pulsed electric action upon deformation on the structure and functional properties of a Ti-Ni alloy with a shape-memory effect

Прокошкин, С. Д.; Stolyarov, V. V.; Korotitskiy, Andrey; Inaekyan, К.; Данилов, Евгений Сергеевич; Khmelevskaya, I. Yu.; Глезер, А. М.; Makushev, S. Yu.; Угурчиев, У. Х.

doi:10.1134/s0031918x09120138

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…It is especially important since this method can be applied to long thin semi-finished parts. A study on the effect of EPR on the deformability of NiTi revealed that high true strains in the range 1-1.8 can be effectively achieved without any macro defects by the application of sufficiently high current densities [29]. Furthermore, the application of very high current densities, around 300 A / mm 2 , resulted in substantial heating of the work material, enough to cause recrystallization, according to the same study.…”

Section: Introductionmentioning

confidence: 78%

On the microstructure and tensile behaviour of nanostructured NiTi alloy produced by electroplastic rolling

et al. 2022

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Electroplastic rolling was employed to produce nanostructured (NS), near-equiatomic NiTi alloy from a coarse grained NiTi nugget (ingot), which was produced using vacuum induction melting, followed by quenching in water from a temperature of 800°C. The microstructure of NS NiTi was characterized using X-ray Diffraction (XRD) and transmission electron microscopy (TEM). XRD analysis revealed that the NS NiTi is predominantly martensitic at room temperature, with less than ≈10 % of the austenite phase. The NS NiTi alloy has an average grain size of ≈36 nm. TEM investigation confirmed the presence of grains that are less than 10 nm in size and no amorphous zones were detected. The NS martensitic NiTi alloy specimens were tested in tension at two different strain rates (10 −2 and 10 −1 s −1 ). In contrast to a stress-strain profile expected in a martensitic NiTi alloy, the stress-strain curves show conventional tensile behaviour. The observed UTS was high, around ≈1800 MPa, with a less than usual elongation to failure of ≈6 %. The presence of dimples on the fracture surfaces can be seen in scanning electron microscopy (SEM) images, which is indicative of ductile fracture. The role of grain size in the observed deformation and fracture features is also discussed.

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Section: Introductionmentioning

confidence: 78%

On the microstructure and tensile behaviour of nanostructured NiTi alloy produced by electroplastic rolling

et al. 2022

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“…При этом микротвердость сплава вдоль рабочей длины образцов практически не изменялись. Снижение микротвердости сплава после ЭИО до уровня недеформированного состояния указы-вало главным образом на развитие процессов возврата и/или рекристаллизации [20], интенсивность которых определялась уровнем энергии импульса тока, проходя-щего через образец.…”

Section: результаты и обсуждениеunclassified

“…Электроимпульсная обработка (ЭИО) на сегодняш-ний день рассматривается как один из перспективных методов для формирования МЗ и УМЗ структур в серий-но нагартованных и ИПД материалах за счет их кратков-ременного и сверхскоростного пост-деформационно-го нагрева [17][18][19][20]. Особый интерес, в этом контексте, вызывает оценка эффективности использования ЭИО для измельчения зеренной структуры новых высоколе-гированных термически неупрочняемых aлюминиевых сплавов системы Al-Mg-Sc(Zr), обладающих уникальны-ми параметрами механического поведения, в том числе сверхпластичности [21].…”

Section: Introductionunclassified

Effect of electric pulse treatment on structure of cold-rolled aluminum alloy 1570C

Avtokratova¹,

Ilyasov²,

Valeev³

et al. 2011

LoM

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“…Only a few studies have been carried out on the TiNi shape memory alloys. [7][8][9][10] Ti-Ni based alloys are the most important practical shape memory alloys (SMAs) due to their excellent properties. 11 However, for shape memory applications, transformation temperature control is often very stringent.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the effects of EPT on microstructure or mechanical properties have been studied in many commercial alloys, such as Cu, Cu–Zn, Cu–Al, Mg alloys and steels. Only a few studies have been carried out on the TiNi shape memory alloys 7 – 10. Ti–Ni based alloys are the most important practical shape memory alloys (SMAs) due to their excellent properties 11.…”

Section: Introductionmentioning

confidence: 99%

Effects of electropulsing treatment on mechanical properties in Ti rich TiNi shape memory alloy

Cao

Zhang

Shek

2013

Materials Science and Technology

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The influence of electropulsing treatment on thermomechanical behaviour in terms of transformation temperatures and mechanical properties of a cold worked Ti rich TiNi shape memory alloy was studied. The results showed that the transformation temperatures increase with increasing current intensity. The superelasticity of the alloy is improved after the electropulsing treatment, and the hardness of the alloy decreased with increasing current intensity. The microstructure of the alloy showed that the above changes can be attributed to the decreasing dislocation density due to the current pulses.

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Investigation of the influence of the parameters of pulsed electric action upon deformation on the structure and functional properties of a Ti-Ni alloy with a shape-memory effect

Cited by 6 publications

References 5 publications

On the microstructure and tensile behaviour of nanostructured NiTi alloy produced by electroplastic rolling

On the microstructure and tensile behaviour of nanostructured NiTi alloy produced by electroplastic rolling

Effect of electric pulse treatment on structure of cold-rolled aluminum alloy 1570C

Effects of electropulsing treatment on mechanical properties in Ti rich TiNi shape memory alloy

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