Design of NiTi-based shape memory microcomposites with enhanced elastocaloric performance by a fully thermomechanical coupled phase-field model

Cissé, Cheikh; Zaeem, Mohsen Asle

doi:10.1016/j.matdes.2021.109898

Cited by 25 publications

(9 citation statements)

References 79 publications

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“…Reliable testing models are essential for the assessment of SMA characteristics and there have been many efforts made toward the same. 198–203 The impacts of AM processes on the SMA characteristics and properties are also being explored in depth. 204–207 The fatigue modeling of SMAs fabricated through AM is another topic of interest with many recent and ongoing studies.…”

Section: Discussionmentioning

confidence: 99%

The role of NiTi shape memory alloys in quality of life improvement through medical advancements: A comprehensive review

Nair

Radhika

2022

Proc Inst Mech Eng H

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The significance of advanced smart materials in recent technological research and advancement is apparent from its extensive use in present day devices and instruments. Of the various smart materials in use today, the fascinating category of shape memory alloys (SMAs) is equipped with the ability to return to a previously memorized shape under certain thermomechanical or magnetic stimuli. The unique property of shape memory effect and superelasticity displayed by these materials along with good biocompatibility and corrosion resistance make them ideal for biomedical applications. The various applications of SMAs in surgical instruments, surgical implants, and assistive and rehabilitative devices have significant effect on the day to day life of people in the present age. Majority of these biomedical devices belong to the orthodontic, orthopedic, or surgical fields. Other remarkable applications of SMAs such as in the production of prostheses and orthoses designed through the biomimetic approach are also highly influential in improving the quality of life. The present paper provides an overview of the various properties of shape memory alloys and their applications in the biomedical field over the years, that have had a significant impact on the realm of medical science.

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Section: Discussionmentioning

confidence: 99%

The role of NiTi shape memory alloys in quality of life improvement through medical advancements: A comprehensive review

Nair

Radhika

2022

Proc Inst Mech Eng H

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“…The elastocaloric effect refers to the adiabatic temperature variation (∆T ad ) of elastocaloric materials by the entropy change upon external stress [2,4,6]. For elastocaloric applications, in addition to the large ∆T ad [6,8,9] and strong heat transfer [10,11], durable fatigue resistance [6,11,12] is also vital for elastocaloric system.…”

Section: Introductionmentioning

confidence: 99%

“…The laser powder bed fusion (LPBF) is well known for layer-by-layer control and endowing near-net-shape SMA parts with large surface areas for efficient heat transfer in elastocaloric devices [10,28,29]. In addition, the LPBF process has an ultra-rapid solidification of more than 10 4 • Cs −1 [30][31][32], which is tens of thousands of times more than that of conventional casting.…”

Section: Introductionmentioning

confidence: 99%

Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

Feng,

Liu,

Yang

et al. 2024

Int. J. Extrem. Manuf.

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NiTiCu-based shape memory alloys have been considered as ideal materials for solid-state refrigeration due to their superb cycling stability for elastocaloric effect. However, the embrittlement and deterioration resulted from coarse grains and large-sized secondary phase restrict their application, and it is still challenging since the geometry is required. Here, bulk NiTiCuCo parts with excellent forming quality were fabricated by laser powder bed fusion (LPBF) technique. The as-fabricated alloy exhibits a refined three-phases hierarchical microcomposites structure formed based on the processing mode of LPBF, in which intricate dendritic Ti2Ni-NiTi composites and nano Ti2Cu uniformly embedded inside the NiTi-matrix. This configuration endows far superior elastocaloric stability compared to the cast counterpart. The low fatigue stems from the strong elastic coupling between the interphase with reversible martensite transformation inside the refined microcomposites, revealed by in-situ synchrotron high-energy X-ray diffraction. The fabrication of NiTiCuCo alloy via LPBF fill the bill of complex geometric structures for elastocaloric NiTiCu alloys. The interphase coupling micro-behaviors provide the guide for the design LPBF fabricated shape memory-based composites, enabling their applications with special demands on other functionalities.

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“…Levitas et al [32][33][34] constructed a thermodynamically consistent PFM for transformations between austenite and martensitic variants and martensitic reorientation. Since then the phase-field (PF) theory is extended for the cases of surface stresses [35,36], large strain [37,38], and eCE [39][40][41][42]. The research that explores eCE by PFM has recently emerged, owing to the rise of efficient solid-state cooling technology by eCE as well as the PFM's advantage in simulating the evolution of microstructure and temperature during the MT process.…”

Section: Introductionmentioning

confidence: 99%

“…A mesoscale model [49] based on the Müller-Achenbach-Seelecke theory without PF order parameters was also developed to describe the evolution of local temperature and strain in SMA films during elastocaloric cycling. Meanwhile, the latent heat effect [44,46], size effect [45,47,50], plasticity [40,41] , and microstructure design [42,48] are considered to regulate eCE. Nevertheless, all the above mentioned works are focused on the application of PF simulations to directly evaluate ∆T ad during loading and unloading by solving the heat-transfer equation.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

Tang¹,

Yang²,

Xu³

et al. 2023

Preprint

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Modelling elastocaloric effect (eCE) is crucial for the design of environmentally friendly and energy-efficient eCE based solid-state cooling devices. Here, a thermodynamically consistent non-isothermal phase-field model (PFM) coupling martensitic transformation with mechanics and heat transfer is developed and applied for simulating eCE. The model is derived from a thermodynamic framework which invokes the microforce theory and Coleman-Noll procedure. To avoid the numerical issue related to the non-differentiable energy barrier function across the transition point, the austenite-martensite transition energy barrier in PFM is constructed as a smooth function of temperature. Both the indirect method using isothermal PFM with Maxwell relations and the direct method using non-isothermal PFM are applied to calculate the elastocaloric properties. The former is capable of calculating both isothermal entropy change and adiabatic temperature change (∆T ad ), but induces high computation cost. The latter is computationally efficient, but only yields ∆T ad . In a model Mn-22Cu alloy, the maximum ∆T ad (∆T max ad ) under a compressive stress of 100 MPa is calculated as 9.5 and 8.5 K in single crystal (3.5 and 3.8 K in polycrystal) from the indirect and direct method, respectively. It is found that the discrepancy of ∆T max ad by indirect and direct method is within 10% at stress less than 150 MPa, confirming the feasibility of both methods in evaluating eCE at low stress. However, at higher stress, ∆T max ad obtained from the indirect method is notably larger than that from the direct one. This is mainly attributed to that in the non-isothermal PFM simulations, the relatively large temperature increase at high stress could in turn hamper the austenite-martensite transition and thus finally yield a lower ∆T ad . The results demonstrate the developed PFM herein, combined with both indirect and direct method for eCE calculations, as a practicable toolkit for the computational design of elastocaloric devices.

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Design of NiTi-based shape memory microcomposites with enhanced elastocaloric performance by a fully thermomechanical coupled phase-field model

Cited by 25 publications

References 79 publications

The role of NiTi shape memory alloys in quality of life improvement through medical advancements: A comprehensive review

The role of NiTi shape memory alloys in quality of life improvement through medical advancements: A comprehensive review

Endowing low fatigue for elastocaloric effect by refined hierarchical microcomposite in additive manufactured NiTiCuCo alloy

Thermodynamically consistent non-isothermal phase-field modelling of elastocaloric effect: indirect vs direct method

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