Micro selective laser melting of NiTi shape memory alloy: Defects, microstructures and thermal/mechanical properties

Fu, Jin; Hu, Zhiheng; Song, Xu; Zhai, Wei; Yu, Lihua; Li, Heng; Fu, Mingwang

doi:10.1016/j.optlastec.2020.106374

Cited by 74 publications

(21 citation statements)

References 40 publications

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“…The parameter combination is shown in Table 1. The two-way scanning strategy (Figure 2) is adopted, and the next layer is rotated 90 degrees compared to the previous layer [24], the x-direction and y-direction are the scanning directions, and the z-direction is the building direction (BD). The physical map of the prepared samples is shown in Figure 3.…”

Section: Materials and Process Parametersmentioning

confidence: 99%

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Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Yang

et al. 2022

Applied Sciences

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NiTiNb is a wide-hysteresis shape memory alloy. The Laser Solid Forming (LSF) technology can overcome the shortcomings of the traditional long cycle processing to prepare NiTiNb. In this work, we studied the microstructure and phase transformation temperature of the NiTiNb prepared by LSF., in which the Ni + Ti + Nb mixed powder was melted under different laser power P, scanning speed v, layer thickness t, and energy density EV. The results show that the combination of LSF process parameters with P = 2000 W and v = 900 mm/min can obtain a good metallurgical bond. As the laser power increases, the grain size increases, and the proportion of equiaxed crystals increases, the martensite transformation temperature increases. The inhomogeneity of the LSF-NiTiNb microstructure results in different phase transformation temperatures even in the same sample. The subsequent heat treatment at 850 °C for 3 h increases the phase transformation temperature and hysteresis of LSF-NiTiNb. The tensile properties of the LSF-NiTiNb samples with different building heights are significantly different. The maximum elongation reaches 8% and the minimum elongation is only 0.8%. The LSF parameter combination in this work has reference value for the parameter selection of subsequent preparation of NiTiNb.

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Section: Materials and Process Parametersmentioning

confidence: 99%

“…In medical field, AM can convert patient-specific data for customized products and medical interventions [21]. Therefore, the use of AM technology to prepare NiTi-based alloys has attracted more and more attention [11,[22][23][24]. In general, metallic AM techniques can be divided into three types based on heat source, i.e.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Yang

et al. 2022

Applied Sciences

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“…Ti 2 Ni is the most widely reported precipitate, mainly forming in the Ti-rich or near-equiatomic NiTi alloy system. 71,86 Depending on the process parameters and starting composition, the morphological structure of Ti 2 Ni precipitates can be formed in interdendritic regions (Fig. 9a) or uniformly dispersed in the matrix, more likely at grain boundaries (Fig.…”

Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Safaei

Abedi

Nematollahi

et al. 2021

JOM

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NiTi shape memory alloys (SMAs) are used in a broad range of biomedical applications because of their unique properties including biocompatibility and high corrosion and wear resistance as well as functional properties such as superelasticity and the shape memory effect. The combination of SMAs and additive manufacturing can lead to revolutionary changes to the uses of SMAs in the biomedical industry. This article discusses the potential biomedical applications of NiTi that benefit from the AM process. We share the lessons learned in processing NiTi alloys with a focus on the laser powder bed fusion (LPBF) technique. The manufacturability, build quality, stable phases and transformation temperatures, microstructure, thermomechanical properties, microstructure tailoring, and functional properties of NiTi alloys produced via AM processing are reviewed. Current challenges such as expanding the process window, controlling the chemistry, and the performance and property responses are discussed, and potential opportunities including alloy design are discussed.

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“… Compression and tensile properties of Ni-Ti alloy formed by SLM [ 10 , 11 , 13 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. …”

Section: Figurementioning

confidence: 99%

“…Figure 8. Compression and tensile properties of Ni-Ti alloy formed by SLM[10,11,13,[16][17][18][19][20][21][22][23][24][25][26].…”

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Research Status and Prospect of Additive Manufactured Nickel-Titanium Shape Memory Alloys

Wen

Gan

Li³

et al. 2021

Materials

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Nickel-titanium alloys have been widely used in biomedical, aerospace and other fields due to their shape memory effect, superelastic effect, as well as biocompatible and elasto-thermal properties. Additive manufacturing (AM) technology can form complex and fine structures, which greatly expands the application range of Ni-Ti alloy. In this study, the development trend of additive manufactured Ni-Ti alloy was analyzed. Subsequently, the most widely used selective laser melting (SLM) process for forming Ni-Ti alloy was summarized. Especially, the relationship between Ni-Ti alloy materials, SLM processing parameters, microstructure and properties of Ni-Ti alloy formed by SLM was revealed. The research status of Ni-Ti alloy formed by wire arc additive manufacturing (WAAM), electron beam melting (EBM), directional energy dedication (DED), selective laser sintering (SLS) and other AM processes was briefly described, and its mechanical properties were emphatically expounded. Finally, several suggestions concerning Ni-Ti alloy material preparation, structure design, forming technology and forming equipment in the future were put forward in order to accelerate the engineering application process of additive manufactured Ni-Ti alloy. This study provides a useful reference for scientific research and engineering application of additive manufactured Ni-Ti alloys.

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Micro selective laser melting of NiTi shape memory alloy: Defects, microstructures and thermal/mechanical properties

Cited by 74 publications

References 40 publications

Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Research Status and Prospect of Additive Manufactured Nickel-Titanium Shape Memory Alloys

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