Martensite twin formation and mechanical properties of B2 austenite NiTi shape memory alloy undergoing severe plastic deformation and subsequent annealing

Yan, Bingyao; Jiang, Shengyao; Sun, Dong; Wang, Man; Yu, Junbo; Zhang, Yanqiu

doi:10.1016/j.matchar.2021.111273

Cited by 17 publications

(7 citation statements)

References 48 publications

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“…Regarding the two polycrystalline models, the average dislocation density decreased according to the decrease in grain size. This may be attributed to the following reasons: ( i ) Grain boundaries hinder the movement of dislocations [ 11 , 33 ]. The finer the grains, the higher the ratio of the grain boundaries and the greater their hindering effects.…”

Section: Resultsmentioning

confidence: 99%

Atomistic Simulation of Microstructural Evolution of Ni50.8Ti Wires during Torsion Deformation

Liu

Yuan

et al. 2021

Materials

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To explore the microstructural evolution of Ni50.8Ti wires during torsion deformation, single and polycrystalline models with various grain sizes (d = 9 nm, 5.6 nm, and 3.4 nm) were established on an atomic scale to explore their grain morphology evolution, stress-induced martensitic transformation, and dislocation movement. The results indicated that the grains were rotated and elongated to form long strips of grains during the torsion simulation. With the increase in torsion deformation, the elongated grains were further split, forming smaller grains. Stress-induced martensitic transformation took place and the martensite preferentially nucleated near the grain boundary, resulting in the formation of 30% austenites and 50% martensites. Additionally, a certain number of dislocations were generated during the torsion simulation. Under a low degree of torsion deformation, the main mechanism of plastic deformation was dislocation movement, while with a large degree of torsion deformation, the main mechanism of plastic deformation was grain rotation.

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Section: Resultsmentioning

confidence: 99%

Atomistic Simulation of Microstructural Evolution of Ni50.8Ti Wires during Torsion Deformation

Liu

Yuan

et al. 2021

Materials

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“…Yan et al [43] found that compared to CG NiTi SMAs, the NC austenite NiTi (Ni-49.3Ti, at.%) SMA with a B2 (CsCl) type ordered structure showed a significantly enhanced compressive yield strength of 2552.1 MPa, and the value of stress-induced austenite transformation increased with decreasing grain size. Nie et al [44] found that the HPT-processed NC Ni 50.2 Ti 49.8 alloy exhibited a hardness of 456.8 ± 14.9 HV.…”

Section: Biomedical Nc Smasmentioning

confidence: 99%

Recent Progress on Nanocrystalline Metallic Materials for Biomedical Applications

Wang

Wen

2022

Nanomaterials

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Nanocrystalline (NC) metallic materials have better mechanical properties, corrosion behavior and biocompatibility compared with their coarse-grained (CG) counterparts. Recently, nanocrystalline metallic materials are receiving increasing attention for biomedical applications. In this review, we have summarized the mechanical properties, corrosion behavior, biocompatibility, and clinical applications of different types of NC metallic materials. Nanocrystalline materials, such as Ti and Ti alloys, shape memory alloys (SMAs), stainless steels (SS), and biodegradable Fe and Mg alloys prepared by high-pressure torsion, equiangular extrusion techniques, etc., have better mechanical properties, superior corrosion resistance and biocompatibility properties due to their special nanostructures. Moreover, future research directions of NC metallic materials are elaborated. This review can provide guidance and reference for future research on nanocrystalline metallic materials for biomedical applications.

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“…X. Dong et al (2021) studied the uniaxial tensile testing and water bath heating on TiO2 films with thicknesses of approximately 100 and 50 nm which were deposited on dumbbell-shaped plate samples of an NiTi shape memory alloy [13]. A.…”

Section: Figurementioning

confidence: 99%

“…X. Wang et al (2021) studied an anomalous phenomenon on two loading cycles of NiTi shape memory alloys when deforming at the temperature close to the border of superelastic window to show that critical stress for inducing martensite transformation during the second loading cycle is higher than that of the first cycle. Also, the plateau stress of the second cycle decreases to the original level when the strain overcomes the limit of the first cycle.…”

Section: Figurementioning

confidence: 99%

Mechanical Properties of NiTi Based Shape Memory Alloy used in Manufacturing of Mars Rover Wheels: Short Review

Parmar¹,

Mishra²

2022

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Shape memory alloys (SMA) are innovatively designed for engineering applications including, but not limited to, medical devices, actuators, micromechanical systems, deployable structures, and elastocaloric devices. Prior to the manufacture of any component for the above mentioned applications, an extensive simulation study is recommended as the basic properties are required to be filled in the software. The unavailability of to-the-point literature makes this task difficult for researches. In this paper, an overview of binary NiTi based shape memory alloy is given, where its characteristic physical properties i.e. shape memory effect and super elastic effect, and mechanical properties like fatigue failure, stress-strain characteristics and yield and ultimate strength is stated for several different specimens prepared using thermomechanical methods.

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Martensite twin formation and mechanical properties of B2 austenite NiTi shape memory alloy undergoing severe plastic deformation and subsequent annealing

Cited by 17 publications

References 48 publications

Atomistic Simulation of Microstructural Evolution of Ni50.8Ti Wires during Torsion Deformation

Atomistic Simulation of Microstructural Evolution of Ni50.8Ti Wires during Torsion Deformation

Recent Progress on Nanocrystalline Metallic Materials for Biomedical Applications

Mechanical Properties of NiTi Based Shape Memory Alloy used in Manufacturing of Mars Rover Wheels: Short Review

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