Simultaneous enhancement of mechanical and shape memory properties by heat-treatment homogenization of Ti2Ni precipitates in TiNi shape memory alloy fabricated by selective laser melting

Lu, H.Z.; Liu, Lehua; Chao, Yang; Luo, Xuan; Song, Changhui; Wang, Z.; Wang, J.; Su, Yanqing; Ding, Yi; Zhang, L.C.; Li, Y.Y.

doi:10.1016/j.jmst.2021.06.019

Cited by 142 publications

(26 citation statements)

References 71 publications

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“…Recently, the fabrication of NiTi SMAs by additive manufacturing (AM) has been frequently addressed [ 26 , 27 , 28 , 29 , 30 , 31 ], due to its ability to fabricate geometrically complex NiTi structures, which are quite challenging to fabricate via conventional approaches (e.g., casting, machining). Among the AM technologies, laser powder bed fusion (L-PBF) has attracted much attention [ 32 , 33 , 34 , 35 , 36 , 37 ] due to the fact that L-PBF fabricated parts normally have a higher dimensional accuracy and better surface finish.…”

Section: Introductionmentioning

confidence: 99%

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Jiang

et al. 2022

Materials

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Besides the unique shape memory effect and superelasticity, NiTi alloys also show excellent damping properties. However, the high damping effect is highly temperature-dependent, and only exists during cooling or heating over the temperature range where martensitic transformation occurs. As a result, expanding the temperature range of martensite transformation is an effective approach to widen the working temperature window with high damping performance. In this work, layer-structured functionally graded NiTi alloys were produced by laser powder bed fusion (L-PBF) alternating two or three sets of process parameters. The transformation behavior shows that austenite transforms gradually into martensite over a wide temperature range during cooling, and multiple transformation peaks are observed. A microstructure composed of alternating layers of B2/B19′ phases is obtained at room temperature. The functionally graded sample shows high damping performance over a wide temperature range of up to 70 K, which originates from the gradual formation of the martensite phase during cooling. This work proves the potential of L-PBF to create NiTi alloys with high damping properties over a wide temperature range for damping applications.

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Section: Introductionmentioning

confidence: 99%

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Jiang

et al. 2022

Materials

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“…In recent works, Shape Memory Alloys (SMA) have proven to be highly suited for the creation of adaptive structures [ 1 , 2 , 3 , 4 , 5 , 6 ]. Their thermomechanically induced shape change properties enable their use as actuators, thereby the reducing size, complexity and cost of actuation-based applications by replacing conventional actuators such as electrical motors, hydraulics and pneumatics [ 7 , 8 , 9 ]. Due to the low required construction space of SMA actuators, they are well-suited for integration in fiber-reinforced polymer (FRP) composites, thus enabling the creation of functionally integrated adaptive structures with properties tailored to specific applications [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Hinged Adaptive Fiber-Rubber Composites Driven by Shape Memory Alloys—Development and Simulation

et al. 2022

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Adaptive structures based on fiber-rubber composites with integrated Shape Memory Alloys are promising candidates for active deformation tasks in the fields of soft robotics and human-machine interactions. Solid-body hinges improve the deformation behavior of such composite structures. Textile technology enables the user to develop reinforcement fabrics with tailored properties suited for hinged actuation mechanisms. In this work, flat knitting technology is used to create biaxially reinforced, multilayer knitted fabrics with hinge areas and integrated Shape Memory Alloy wires. The hinge areas are achieved by dividing the structures into sections and varying the configuration and number of reinforcement fibers from section to section. The fabrics are then infused with silicone, producing a fiber-rubber composite specimen. An existing simulation model is enhanced to account for the hinges present within the specimen. The active deformation behavior of the resulting structures is then tested experimentally, showing large deformations of the hinged specimens. Finally, the simulation results are compared to the experimental results, showing deformations deviating from the experiments due to the developmental stage of the specimens. Future work will benefit from the findings by improving the deformation behavior of the specimens and enabling further development for first applications.

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“…Haberland et al [ 26 ] researched the superelasticity and cyclic response of NiTi alloys fabricated by SLM. Lu et al [ 27 ] learned the simultaneous improvement of mechanical properties and shape memory properties by proper precipitation of the Ti 2 Niphase and its mechanism of action. It can be found that a lot of research has been carried out on NiTi alloys with SLM technology, from process parameters and structure to properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Transformation in Laser Additive Manufactured NiTi Alloy with Quasi-In-Situ Compression

et al. 2022

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For NiTi alloys, different additive manufacturing processes may have different compressive recovery capabilities. In particular, there are relatively few studies on the compressive recovery ability of NiTi alloys by the laser-directed energy deposition (LDED) process. In this paper, the compression recovery properties of NiTi alloys with the LDED process were investigated quasi-in-situ by means of transmission electron microscopy, an electron backscatter diffractometer, and focused ion beam–fixed-point sample preparation. The results showed that the material can be completely recovered under 4% deformation and the B19’ martensite phase content and dislocation density are basically unchanged. However, the recovery rate was only 90% and the unrecoverable strain was 0.86% at 8% deformation. Meanwhile, the B19’ martensite phase content and dislocation density of the material increased. Furthermore, with the increase in deformation, the relative dislocation pinning effect of the Ti2Ni precipitated phase in the alloy was enhanced, which reduced the compressive strain recovery to a certain extent.

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Simultaneous enhancement of mechanical and shape memory properties by heat-treatment homogenization of Ti2Ni precipitates in TiNi shape memory alloy fabricated by selective laser melting

Cited by 142 publications

References 71 publications

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Structure, Martensitic Transformation, and Damping Properties of Functionally Graded NiTi Shape Memory Alloys Fabricated by Laser Powder Bed Fusion

Hinged Adaptive Fiber-Rubber Composites Driven by Shape Memory Alloys—Development and Simulation

Microstructure Transformation in Laser Additive Manufactured NiTi Alloy with Quasi-In-Situ Compression

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