Shape Memory and Mechanical Properties of a Fe-Mn-Si-Based Shape Memory Alloy: Effect of Crystallographic Texture Inherited by Additive Manufacturing

Ferretto, Irene; Kim, Dohyung; Lee, Wookjin; Hosseini, Ehsan Shah; Ventura, Nicoló Maria della; Sharma, Amit; Sofras, Christos; Čapek, Jan; Polatidis, Efthymios; Leinenbach, Christian

doi:10.2139/ssrn.4328057

Cited by 2 publications

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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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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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Adapting Fe–Mn–Si–Cr shape memory alloy for laser powder bed fusion by adjusting the Mn content

Gärtner,

Meyenborg,

Toenjes

2023

Prog Addit Manuf

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Shape memory alloys (SMA) are functional materials exhibiting the shape memory effect. Conventional standard manufacturing technologies for shape memory alloys include melting, casting, and forming. These often require additional machining steps to achieve the final component shape, limiting the geometric design. The production of SMAs using additive manufacturing technologies opens up new possibilities, but research has been limited, especially for iron-based SMAs. The present study investigated whether an iron-based SMA alloy powder suitable for the additive manufacturing process can be produced via atomization and subsequently 3D printed with laser powder bed fusion (PBF-LB/M). Two FeMnSi SMAs with varying manganese contents of 23.6% and 28.5% were successfully atomized and laser processed. The effect of the manganese content on the shape memory characteristics was investigated by means of dilatometry. A 5 wt% change in manganese content was found to impact the onset of the keyhole fusion mode for PBF-LB/M as well as the resulting shape memory characteristics. Reduced manganese content is shown to enhance the shape memory effect of FeMnSi.

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Shape Memory and Mechanical Properties of a Fe-Mn-Si-Based Shape Memory Alloy: Effect of Crystallographic Texture Inherited by Additive Manufacturing

Cited by 2 publications

References 0 publications

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

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

Adapting Fe–Mn–Si–Cr shape memory alloy for laser powder bed fusion by adjusting the Mn content

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