The martensite deformation in titanium nickelide

Paskal, Yu. I.; Erofeev, V. Ya.; Monasevich, L. A.; Pavskaya, V. A.

doi:10.1007/bf00898750

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Figure 8 shows the stress-induced martensite fraction response versus the stress, which again converges to a limit cycle. Similar cycling to limit cycles has been observed experimentally and in kinetic modeling [24,30,35], and the ability to capture this response demonstrates the capabilities of the kinetic mathematical description and its numeric implementation.…”

Section: Sma Behavior Under Cyclic Loadingsupporting

confidence: 64%

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Phase diagram kinetics for shape memory alloys: a robust finite element implementation

Gao

Qiao

Brinson

2007

Smart Mater. Struct.

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A physically based one-dimensional shape memory alloy (SMA) model is implemented into the finite element software ABAQUS via a user interface. Linearization of the SMA constitutive law together with complete transformation kinetics is performed and tabulated for implementation. Robust rules for transformation zones of the phase diagram are implemented and a new strategy for overlapping transformation zones is developed. The iteration algorithm, switching point updates and solution strategies are developed and are presented in detail. The code is validated via baseline simulations including the shape memory effect and pseudoelasticity and then further tested with complex loading paths. A hybrid composite with self-healing function is then simulated using the developed code. The example demonstrates the usefulness of the methods for the design and simulation of materials or structures actuated by SMA wires or ribbons.

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Section: Sma Behavior Under Cyclic Loadingsupporting

confidence: 64%

“…The examples given here were calculated using ABAQUS Standard 6.4 and the parameters used are from existing experimental data (table 3). It should be noted that the constitutive model does not attempt to capture the few initial cycles common to stabilize SMA parameters [35,36] and thus the material properties used should be stabilized values.…”

Section: Resultsmentioning

confidence: 99%

Phase diagram kinetics for shape memory alloys: a robust finite element implementation

Gao

Qiao

Brinson

2007

Smart Mater. Struct.

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Effect of deformation and external load on the characteristics of martensite transformations and shape-memory effects in alloys based on titanium nickelide

Gunter¹,

Maletkina²,

Клопотов³

1998

J Appl Mech Tech Phys

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The effect of plastic deformation and external load on the characteristics of shape-memory effects is studied for alloys based on titanium nickelide of nearly equiatomic composition. A nonmonotonic dependence of the characteristic temperatures of martensite transformations on the strain degree of deformation is obtained. This phenomenon is explained in relation to the stages of development of plastic deformation. Optimal loading and deformation conditions for obtaining maximum values of reversible deformation are determined.Alloys based on titanium nickelide, which exhibit the shape-memory effect and other unusual physicomechanical properties, are very sensitive to changes in the external structure of the material. Preliminary thermomechanical treatment allows one to purposely change the parameters of the shapememory effect and the physicomechanical properties of the alloys. Although this problem has been extensively studied in the literature [1-6], there has been no complex investigation of the effects of external stresses and temperature on alloys based on titanium nickefide and the effect of stresses and deformation on the parameters of the shape-memory effect and the characteristic temperatures of martensite transformations (MT) in these alloys. The present paper is devoted to this problem.1. Materials and Experimental Procedure. The alloys studied were produced from titanium iodide and NO-graded nickel in an arc-discharge furnace. The alloys had the same compositions as TN-10 and TN-20 alloys [7]. The alloys were shaped into a wire of diameter 1.5 ram by hot extrusion through dies. After chemical treatment by etching, the specimens were held in vacuum (10 -5 Pa) at 1080 K for 1 h and cooled with the furnace. The temperatures of MT were determined from the variation of the electrical resistance with temperature and x-ray structural analysis data. Curves of electrical resistance were measured by the conventional potentiometric four-point method. X-ray structural studies were performed on a DRON-2 apparatus. The parameters of the shape-memory effect were studied by measuring macrostraln during stretching under load on an "Instron" device in the cycle loading-cooling-heating. Wire specimens of the alloys 60 mm long and 1 mm in diameter were loaded at various temperatures: 77, 223, 323, 373, 423, and 473 K. The external loads corresponded to stresses of 40, 120, and 230 MPa. The influence of prestrain on the shape-memory effect was also studied after rolling of specimens 60 mm long with a square cross section 1 mm 2. The specimens were rolled in one pass at room temperature with an average reduction of 4-6% per pass.2. Crystal Structure and MT in the Alloys. In the high-temperature region, the alloys are in the one-phase state: the Ti2Ni phase with the B2 structure. The presence of a minor portion of the Ti2Ni phase in the form of highly disperse inclusions has little effect on the characteristics of the shape-memory effect. As the temperature decreases from 473 K, TN-20 alloy undergoes the martensite transformat...

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АНАЛИЗ ИЗМЕНЕНИЯ МИКРОСТРУКТУРЫ И ТЕМПЕРАТУР МАРТЕНСИТНЫХ ПРЕВРАЩЕНИЙ В СПЛАВЕ TiNi С РАЗЛИЧНОЙ СТРУКТУРОЙ

Чуракова,

Исхакова

2024

NanoRus

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В представленной статье проведены исследования влияния многократных мартенситных превращений В2-В19’ на структуру и температуры превращений в различных структурных состояниях сплава TiNi. Показано, что в крупнозернистом, ультрамелкозернистом и нанокристаллическом сплаве TiNi происходят последовательные изменения в микроструктуре и температурах фазовых переходов, при увеличении числа термоциклов до n=100 с быстрым нагревом и быстрым охлаждением до –196 °C. Температуры превращений в ультрамелкозернистом состоянии Ti49.15Ni50.85 более устойчивы к термоциклированию (ТЦ), чем в крупнозернистом состоянии. Обнаружено образование нанодвойников мартенсита в наноструктурном состоянии после многократных термоциклов.

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The martensite deformation in titanium nickelide

Cited by 3 publications

References 18 publications

Phase diagram kinetics for shape memory alloys: a robust finite element implementation

Phase diagram kinetics for shape memory alloys: a robust finite element implementation

Effect of deformation and external load on the characteristics of martensite transformations and shape-memory effects in alloys based on titanium nickelide

АНАЛИЗ ИЗМЕНЕНИЯ МИКРОСТРУКТУРЫ И ТЕМПЕРАТУР МАРТЕНСИТНЫХ ПРЕВРАЩЕНИЙ В СПЛАВЕ TiNi С РАЗЛИЧНОЙ СТРУКТУРОЙ

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