Investigation on the influence of thermomechanical conditions of induction and structure on the shape memory effects in Ti-Ni alloy

Рыклина, Е. П.; Прокошкин, С. Д.; Chernavina, A. A.; Perevoshchikova, Nataliya

doi:10.1134/s2075113310030032

Cited by 16 publications

(2 citation statements)

References 4 publications

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“…If there are many coherent boundaries, including both transformation twins and mechanical twin boundaries formed upon direct transformation under external load, the amount of recovered strain can exceed the amount of proper transformation strain [22], which is confirmed experimentally [23,24].…”

Section: Additional Remarksmentioning

confidence: 67%

Morphological features in B2→B19 martensitic transformation and their description based on the concept of controlling wave process

Кащенко

Чащина

2015

Phys Mesomech

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The paper analyzes the possibility of describing morphological features in the B2→B19 transformation in the framework of a dynamic theory based on the concepts of heterogeneous nucleation and wave growth of martensite crystals. It was shown, using TiNiCu alloys as an example, that the predicted and observed orientations of habit planes agree well. The issue that strain ratios remain valid in going from threshold to final strains is considered, and calculation results for orientation relations and their fulfilment conditions are discussed.

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Section: Additional Remarksmentioning

confidence: 67%

Morphological features in B2→B19 martensitic transformation and their description based on the concept of controlling wave process

Кащенко

Чащина

2015

Phys Mesomech

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“…Известно, что размер зерна исходной фазы (B2-аустенита) влияет на функциональные и механические свойства СПФ Ti-Ni [10][11][12][13][14][15][16][17][18]. В работе [12] было показано, что в сплаве Ti-50,8ат.%Ni после холодного волочения с обжатием 25 % и отжига при t = 700 °С с выдержкой от 3 мин до 24 ч температура начала мартенситного превращения практически не изменяется в результате увеличения размера зерна от 5 до 22 мкм, а дополнительное старение при t = 250 °С, τ = 24 ч меняет стадийность мартенситных превращений.…”

Section: Introductionunclassified

Effect of annealing temperature and time on martensitic transformation temperatures and mechanical properties of the Ti–50.7at.%Ni shape memory alloy

Полякова¹,

Komarov²

2021

Izv.VUZ. Tsvet. Met.

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The study covers the effect of recrystallization annealing temperature and time on the characteristic temperatures of martensitic transformations and mechanical properties of the Ti–50.7at.%Ni shape memory alloy in the form of wire after cold drawing at room temperature. Six modes of post-deformation annealing with different temperatures and holding times were studied for the alloy to obtain structures with different sizes of recrystallized grains. The recrystallized grain size was determined by electron backscatter diffraction (EBSD). It was shown that the size of recrystallized grains increases from 2.5 to 9 μm, with both an increase in the annealing temperature (600– 700 °С) and an increase in the holding time (0.5–5.0 h). The characteristic temperatures of direct and reverse martensitic transformations were determined using differential scanning calorimetry. It was shown that the threefold growth of the recrystallized grain size reduces the starting temperature of the direct martensitic transformation, and extends the temperature range of the reverse martensitic transformation. The results of mechanical tests (stretching tests) at room temperature showed that an increase in the grain size leads to a decrease in the dislocation yield strength and an increase in the phase yield strength. It was established that the dislocation yield strength obeys the Hall–Petch law, and the phase yield strength is determined by the test temperature position relative to the starting (or peak) temperature of the direct martensitic transformation. Heat treatment modes for specific products should be recommended taking into account these two competing factors, as well as reverse martensitic transformation temperatures determining the alloy strain recovery temperatures.

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Alloy Ti – 50.2 at.% Ni for Actuators: Evolution of Structure and Shape Memory Effects Under Post-Deformation Annealing. Part 1. Structure and Phase Transformations

Рыклина¹,

Abduraimova²,

Resnina

2021

Met Sci Heat Treat

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Investigation on the influence of thermomechanical conditions of induction and structure on the shape memory effects in Ti-Ni alloy

Cited by 16 publications

References 4 publications

Morphological features in B2→B19 martensitic transformation and their description based on the concept of controlling wave process

Morphological features in B2→B19 martensitic transformation and their description based on the concept of controlling wave process

Effect of annealing temperature and time on martensitic transformation temperatures and mechanical properties of the Ti–50.7at.%Ni shape memory alloy

Alloy Ti – 50.2 at.% Ni for Actuators: Evolution of Structure and Shape Memory Effects Under Post-Deformation Annealing. Part 1. Structure and Phase Transformations

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