Microstructural effect on the thermomechanical behavior of aged Ni-rich NiTi SMA

Fraj, Boutheina Ben; Zghal, Slim; Gahbiche, Amen; Tourki, Zoubeir

doi:10.1088/2053-1591/ab4d78

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…This is attributed to the formation of a metastable phase compound in the aging process, which alters the Ni concentration and, as a result, A f temperature [9]. Furthermore, the A f temperature dropped sharply with the annealing treatment at temperatures above 500 • C and remained constant for processing temperatures between 600 • C-700 • C. These changes of both A f and M f temperatures are consistent with previous studies [20][21][22][23][24]. These A f temperature behavior are similar in terms of function of annealing temperature to a previous work by Feng et al, which showed that the transformation temperatures increased when annealed at a lower temperature (i.e.…”

Section: Tuning a F Temperature Via Aging Treatmentsupporting

confidence: 90%

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Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing

et al. 2023

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Caloric cooling enlisting solid-state refrigerants is potentially a promising eco-friendly alternative to conventional cooling based on vapor compression. The most common refrigerant materials for elastocaloric cooling to date are Ni-Ti based superelastic shape memory alloys. Here, we have explored tuning the operation temperature range of Ni50.8Ti49.2 for elastocaloric cooling. In particular, we have studied the effect of thermal treatments (a.k.a. aging) on the transformation temperature, superelasticity, and elastocaloric effects of Ni50.8Ti49.2 shape memory alloy tubes. The isothermal compressive test revealed that the residual strain of thermally-treated Ni-Ti tubes at room temperature approaches zero as aging time is increased. Short-time aging treatment at 400 °C resulted in good superelasticity and elastocaloric cooling performance with a large tunable austenite finish (Af) temperature range of 24.7 °C, as determined from the Af temperature of the samples that were aged 5–120 minutes. The main reason of the property change is the formation of a different amount of Ni4Ti3 precipitates in the NiTi matrix. Our findings show that it is possible to tailor the Af temperature range for development of cascade elastocaloric cooling systems by thermally treating a starting single composition Ni-Ti alloy.

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Section: Tuning a F Temperature Via Aging Treatmentsupporting

confidence: 90%

“…350 • C-450 • C) [25] and it decreased when annealed at a relatively higher temperature (i.e. 550 • C-650 • C) [23,25]. Also, the increase of A f in the annealing temperature range of 600 • C-700 • C is consistent with the findings reported by Xu et al [22].…”

Section: Tuning a F Temperature Via Aging Treatmentsupporting

confidence: 89%

Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing

et al. 2023

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“…In this case, the quantity of thermal input given to the system is fixed damping completes in 25 s in given in figure 4. Literature review reveals that the intrinsic damping of SMA in austenitic phase is low, if the external stress is enough to lead of stress-induced phase transformation; here stress-induced martensite causes higher strain energy dissipation [31][32][33][34][35][36][37][38][39][40][41][42][43]. Damping response of this condition is established and given in figure 4 using MATLAB codes.…”

Section: Damping Response Of Three-dimensional Sma With Different Thementioning

confidence: 99%

An improved micro-thermo-mechanics model for shape memory alloys: analysis and applications

Manzoor

Zafar

Manzoor

et al. 2020

Mater. Res. Express

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In this paper, micro-mechanics of shape memory alloys (SMA) is investigated for design of smart structure and devices, based upon three dimensional constitutive model. In this work, a micromechanics based approach is presented. A modification in temperature field of the above model is proposed, where temperature is taken as function of time. Thermal parameters corresponding to transformation temperatures are introduced here. The model solution is presented for the of a set of initial and boundary conditions based upon any type of thermal parameters. Three particular cases for different thermal and structural loading-stresses are presented here. The solution given here expresses the response of smart dampers for various thermal and structural loading conditions. Moreover, the applications of this system were also investigated.

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Heat treatment effects on tribocorrosion resistance of Inconel 718® alloy produced by conventional and laser powder bed fusion methods

Wieczorek,

Ulbrich,

Stachowiak

et al. 2024

Int J Adv Manuf Technol

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The article presents a study of the tribocorrosion phenomenon and its effects on Inconel 718 alloy produced conventionally by extrusion and additively manufactured using the laser powder bed fusion method. In addition, the samples were subjected to a heat treatment process to change their properties. The research was carried out using the pin-on-disk method in 3.5% NaCl. Based on the study, it was found that the material made with additive technology is more resistant to tribocorrosion phenomenon, and the difference from conventionally made material is about 50%. The synergistic effect between friction and corrosion (ΔZ) occurred. However, heat treatment in the AA-2 variant ensures higher hardness and reduces purely mechanical wear (ZM) and the synergy effect (ΔZ).

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Microstructural effect on the thermomechanical behavior of aged Ni-rich NiTi SMA

Cited by 8 publications

References 29 publications

Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing

Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing

An improved micro-thermo-mechanics model for shape memory alloys: analysis and applications

Heat treatment effects on tribocorrosion resistance of Inconel 718® alloy produced by conventional and laser powder bed fusion methods

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