On the crystallographic texture and torsional behavior of NiTi shape memory alloy processed by laser powder bed fusion: Effect of build orientation

Safaei, Keyvan; Nematollahi, Mohammadreza; Bayati, Parisa; Kordizadeh, Fatemeh; Andani, Mohsen Taheri; Abedi, Hossein; Poorganji, Behrang; Elahinia, Mohammad

doi:10.1016/j.addma.2022.103184

Cited by 6 publications

(8 citation statements)

References 78 publications

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“…Additionally, it can be time-consuming, as the process needs to be carefully monitored and controlled [94]. These processes require significant capital investments and are often energy intensive [95]. Thus, a careful selection of the most suitable densification process must be made, considering the cost, energy use, and product properties.…”

Section: Self-propagating High Temperature Synthesismentioning

confidence: 99%

Processing of shape memory alloys research, applications and opportunities: a review

Mehta,

Singh,

Vasudev

2024

Phys. Scr.

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Shape Memory Alloys (SMAs) are metallic materials with unique thermomechanical characteristics that can regain their original shape after deformation. SMAs can be used in various industries such as consumer electronics, automobile parts, aircraft components, and biomedical devices. In this paper, we review the current state of the art of SMA fabrication and their application in the aerospace, healthcare, and aerospace industries. Specifically, we focus on the influence of manganese (Mn) addition on Cu-Al-Ni shape memory alloys' structure, mechanical characteristics, and corrosion behavior, focusing on the incorporation of small and medium-sized enterprises (SMEs) in the analysis of cu-aluminum alloys. This study explores the integration of SME and superelasticity, critical phenomena in SMA behavior, and can be utilized to develop and evaluate SMA-based devices and structures, as well as to understand the mechanism behind SMA actuation and develop improved materials. FEM simulations are crucial for optimizing designs and enhancing performance in sectors like aerospace and healthcare. FEM simulations can also be used to predict the stress and strain of SMA-based devices and structures. This can help to reduce cost, improve efficiency, and reduce the risk of failure. Additionally, FEM simulations can help to identify potential weaknesses in SMA-based designs and suggest modifications or improvements.

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Section: Self-propagating High Temperature Synthesismentioning

confidence: 99%

Processing of shape memory alloys research, applications and opportunities: a review

Mehta,

Singh,

Vasudev

2024

Phys. Scr.

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“…The opportunities that this innovative fabrication process opens are multiple. Complex geometry like lattice structure are now possible [15]; the possibility to tune the material properties by optimizing the process parameters in order to enhance the performances has been highly investigated [16,17]. This technology allows also the fabrication of functionally graded material [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…However, LPBF requires process parameters tuning to prevent the defect population characteristic of the process. Nevertheless, defects can remain even after a process parameter optimization [16].…”

Section: Introductionmentioning

confidence: 99%

Self-Heating and Fatigue Assessment of Laser Powder Bed Fusion NiTi Alloy with High Cycle Fatigue Mechanisms Identification

Cullaz,

Saint-Sulpice,

Elahinia

et al. 2024

Metals

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Rapid methods for assessing the fatigue properties of materials have been developed, among which the self-heating method stands out as particularly promising. This approach analyzes the thermal signal of the specimen when subjected to cyclic loading. In this research, the self-heating method was utilized for the first time with laser powder bed fusion (LPBF) of NiTi alloys, examining two specific loading conditions: loading ratios of 0.1 and 10. A thorough examination of the material self-heating behavior was conducted. For comparative purposes, conventional fatigue tests were also conducted, alongside interrupted fatigue tests designed to highlight the underlying mechanisms involved in high cycle fatigue and potentially self-heating behavior. The investigation revealed several key mechanisms at play, including intra-grain misorientation, the emergence and growth of persistent slip bands, and the formation of stress-induced martensite. These findings not only deepen our understanding of the fatigue behavior of LPBF NiTi alloys but also highlight the self-heating method potential as a tool for studying material fatigue.

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“…Additionally, the functional properties of NiTi can also be adjusted through the Ni-content [2], which could be controlled by the process parameters of PBF-EB using Ni-rich NiTi. As already shown in the manufacturing of shape memory alloys via laser powder bed fusion (PBF-LB), the build orientation influences the functional and mechanical properties [22][23][24][25][26][27][28]. Regarding new possible applications, the choice of the build orientation with an anisotropic material response offers an interesting new field in research.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Superelastic and Shape Memory Effect of Nitinol Manufactured by Electron Beam Powder Bed Fusion

Fink,

Wahlmann,

K鰎ner

2024

Advanced Materials &Amp; Sustainable Manufacturing

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This study explores the impact of energy input and build orientation on the anisotropic mechanical and functional properties of Ti-rich Nitinol (NiTi) produced via electron beam powder bed fusion (PBF-EB), integrated with layerwise in-situ monitoring of the melted surface via backscatter electron detection (ELO). NiTi, a binary alloy of nickel and titanium, exhibits shape memory and superelasticity, making it widely used in biomedical applications and sustainable technologies. PBF-EB, particularly with ELO, is highlighted for its advantages in producing crack-free NiTi with tailored microstructures. The investigation reveals that energy input significantly influences microstructure phases, with higher energy promoting increased evaporation of Ni and enhancing Ti-rich Ti2Ni precipitates, allowing for tailored material properties. Build orientation also proves crucial, impacting mechanical responses and functional properties. The 0° orientation yields the hardest mechanical response with the highest ultimate tensile strength (UTS) and the highest strain recovery ratio while the 45° orientation shows improved ductility but lower UTS. The influencing factors towards the formation of the anisotropic material properties are explained and the potential of tailoring the NiTi properties for specific applications by controlling energy input and build orientation in the PBF-EB process are underlined. These insights offer valuable criteria for designing innovative NiTi parts.

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On the crystallographic texture and torsional behavior of NiTi shape memory alloy processed by laser powder bed fusion: Effect of build orientation

Cited by 6 publications

References 78 publications

Processing of shape memory alloys research, applications and opportunities: a review

Processing of shape memory alloys research, applications and opportunities: a review

Self-Heating and Fatigue Assessment of Laser Powder Bed Fusion NiTi Alloy with High Cycle Fatigue Mechanisms Identification

Anisotropic Superelastic and Shape Memory Effect of Nitinol Manufactured by Electron Beam Powder Bed Fusion

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