Machining of NiTi-shape memory alloys-A review

Velmurugan, C.; Senthilkumar, V.; Dinesh, S.; Arulkirubakaran, D.

doi:10.1080/10910344.2017.1365894

Cited by 82 publications

(36 citation statements)

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“…However, the conventional machining of nitinol is challenging due to its superelasticity, high ductility, high wear and corrosion resistance, and severe strain hardening [11][12][13]. Researchers reported problems of conventional machining processes for shape-memory alloys [14,15]. K. Weinert and V. Petzoldt [14] concluded that the machining of NiTi-based alloys is complex using conventional techniques like turning, drilling, and deep hole drilling.…”

Section: Introductionmentioning

confidence: 99%

Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys

et al. 2020

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Shape-memory alloys such as nitinol are gaining popularity as advanced materials in the aerospace, medical, and automobile sectors. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape-memory effect, superelasticity, high specific strength, high wear and corrosion resistance, and severe strain hardening. Anunconventional machining process like wire-electrical-discharge-machining (WEDM) can be effectively and efficiently used for the machining of such alloys, although the WEDM-induced surface integrity of nitinol hassignificant impact on material performance. Therefore, this work investigated the surface integrity of WEDM-processed nitinol samples using digital microscopy imaging, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. Three-dimensional analysis of the surfaces was carried out in two different patterns (along the periphery and the vertical plane of the machined surface) andrevealed that surface roughness was maximalat the point where the surface was largely exposed to the WEDM dielectric fluid. To attain the desired surface roughness, appropriate discharge energy is required that, in turn, requires the appropriate parameter settings of the WEDM process. Different SEM image analyses showed a reduction in microcracks and pores, and in globule-density size at optimized parameters. EDX analysis revealed the absence of wire material on the machined surface

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Section: Introductionmentioning

confidence: 99%

Surface Analysis of Wire-Electrical-Discharge-Machining-Processed Shape-Memory Alloys

et al. 2020

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“…Predominantly, the shape memory applications can be separated into four classes as per the essential capacity of their memory component [106][107][108][109] where the SME can be utilized to create movement as well as load, and the SE can store the twisting vitality [110,111]. The extraordinary conduct of SMAs has produced new applications in the aviation, automobile, robotization, and control, machine, vitality, synthetic handling, warming and ventilation, security and safety, and hardware (MEMS gadgets) ventures.…”

Section: Brief Applicability Of Cu-based Smasmentioning

confidence: 99%

Cu-Based Shape Memory Alloys: Modified Structures and Their Related Properties

Saud¹

2020

Recent Advancements in the Metallurgical Engineering and Electrodeposition

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Cu-Al-Ni shape memory alloys (SMAs) have been developed for hightemperature applications due to their ability to return to pre-deformed shape after heating above the transformation temperature, as well as these alloys have a small hysteresis and high transformation temperature comparing with other shape memory alloys. Adding some of the alloying elements such as Ti, Mn, Be, Zr and B or changing the interior content either Al or Ni by increasing/decreasing may have a significant effect on the phase transitions and enhance the mechanical properties of these alloys. However, the martensite phase transformation is the most important factor, which can be changing the whole properties of Cu-Al-Ni SMAs, where this phase is mainly affected by the alloying elements additions. This chapter reviews the effect of alloying elements on the phase transitions and the enhancement of the mechanical properties of this alloy.

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“…Among many conventional machining processes, drilling on NiTi alloys is an equally and increasingly important for fabrications of biomedical components. Holes are required on spinal rods, spinal vertebral spacers, implants, extension springs, etc [3]. These components are typically assembled to other main parts, and hence, drilled holes should not have any burrs for such applications.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Unique properties of SMAs suited them as excellent materials for several noteworthy applications. This includes sensors and actuators for automotive parts; vibration dampers and retractable landing gear for aerospace components; as well as implants and stents for biomedical domains or applications [1][2][3]. Research and development of this unique material cover from high temperature shape memory alloys, magnetic shape memory alloys, thin film shape memory materials, and shape memory polymers.…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, Hsieh et al asserted that impediments toward a comprehensive development of NiTi alloys are attributed to difficulties in manufacturing process, particularly during machining or cutting processes [6]. Many of previous approaches through nonconventional machining processes such as laser forming, electro-discharge machining, waterjet machining, and electronic chemical machining have been successfully studied and implemented for cutting and shaping of the NiTi components [3,[6][7][8][9]. Despite of these research outputs, Kaynak et al stressed that industrial implementation of non-conventional processes for every…”

Section: Introductionmentioning

confidence: 99%

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