Local composition and microstructure control for multiple pseudoelastic plateau and hybrid self-biasing shape memory alloys

Pequegnat, A.; Panton, B.; Zhou, Yunhong; Khan, Muhammad

doi:10.1016/j.matdes.2015.12.078

Cited by 14 publications

(17 citation statements)

References 46 publications

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“…Furthermore, the extrusion-based printing process has extra advantages beyond the above mentioned. Notably, it has the potential to fabricate functional graded materials (FGM) and local component control (LCC) [ 32 , 33 , 34 ] parts with complex structure by using two or more dispensing heads and controlling the respective feeding rate. Fabrication of FGM and LCC parts via an additive manufacturing process is considered to be a new basic science research area [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Process Parameter Optimization of Extrusion-Based 3D Metal Printing Utilizing PW–LDPE–SA Binder System

et al. 2017

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Recently, with a broadening range of available materials and alteration of feeding processes, several extrusion-based 3D printing processes for metal materials have been developed. An emerging process is applicable for the fabrication of metal parts into electronics and composites. In this paper, some critical parameters of extrusion-based 3D printing processes were optimized by a series of experiments with a melting extrusion printer. The raw materials were copper powder and a thermoplastic organic binder system and the system included paraffin wax, low density polyethylene, and stearic acid (PW–LDPE–SA). The homogeneity and rheological behaviour of the raw materials, the strength of the green samples, and the hardness of the sintered samples were investigated. Moreover, the printing and sintering parameters were optimized with an orthogonal design method. The influence factors in regard to the ultimate tensile strength of the green samples can be described as follows: infill degree > raster angle > layer thickness. As for the sintering process, the major factor on hardness is sintering temperature, followed by holding time and heating rate. The highest hardness of the sintered samples was very close to the average hardness of commercially pure copper material. Generally, the extrusion-based printing process for producing metal materials is a promising strategy because it has some advantages over traditional approaches for cost, efficiency, and simplicity.

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Section: Resultsmentioning

confidence: 99%

Process Parameter Optimization of Extrusion-Based 3D Metal Printing Utilizing PW–LDPE–SA Binder System

et al. 2017

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Section: Introductionmentioning

confidence: 99%

“…The next generation of SMA manufacturing will produce components with multiple phase transformations [21][22][23][24][25]. Laser processing of SMAs is a key advancement in this area, which enables the local modification of properties by alteration of the chemistry [21,22]. This has been used to create multiple memory actuators [21,22], self-biasing actuators [26], and many other novel devices including the SmartArch TM a revolutionary orthodontic device.…”

Section: Introductionmentioning

confidence: 99%

“…Laser processing of SMAs is a key advancement in this area, which enables the local modification of properties by alteration of the chemistry [21,22]. This has been used to create multiple memory actuators [21,22], self-biasing actuators [26], and many other novel devices including the SmartArch TM a revolutionary orthodontic device. The only prior work on the effects of a pulsed laser on the thermomechanical fatigue of SMA wires was Panton et al's [27] study on laser welded NiTi.…”

Section: Introductionmentioning

confidence: 99%

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Effects of post-processing on the thermomechanical fatigue properties of laser modified NiTi

Panton

Michael

Zhou

et al. 2019

International Journal of Fatigue

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The multifunctional capabilities needed for advanced shape memory alloys (SMA) actuators has been shown to be achievable by locally tuning the properties through laser processing. Before the wide-spread use of these SMAs is realized, a detailed understanding on the long-term stability and functional life span of these material must be achieved. The current study systematically investigates the effects of thermomechanical treatment on laser modified NiTi wires, while comparing them to the original base material. Surface analysis was done using a scanning electron microscope (SEM), while microstructure analysis was performed using transmission electron microscopy (TEM). Mechanical properties were assessed using standard tensile tests and a custom built thermomechanical fatigue. Results showed that the coarse-grains, large precipitates and surface defects associated with as laser modified NiTi resulted in reduced mechanical performance. However, subsequent thermomechanical treatment restored the refined microstructure and mechanical performance similar to the base material while providing the added functionality.

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“…More recently, SMAs produced by laser method, have been considered in many applications. In many of these methods, a temperature gradient generated through the laser pulses can control the microstructure of the material resulting in gradient properties which lead to the control of the strain by the stress in the plateaus, and also in controlling the transformation strain.…”

Section: Introductionmentioning

confidence: 99%

A Combined Analytic, Numeric, and Experimental Investigation Performed on NiTi/NiTiCu Bi‐Layer Composites under Tensile Loading

et al. 2017

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Adjusting mechanical behavior and controlling deformation parameters are significant tasks in designing shape memory components. In this paper, an analytical model describes the deformation behavior of NiTi/NiTiCu bi-layer composites under tensile loading. Different deformation stages are considered based on single mechanical behavior at each stage. Closed-form equations are derived for stress-strain variations of bi-layer composites under uniaxial loading-unloading. Bi-layer composites made via the diffusion bonding method from single layers of NiTi alloy with a composition of Ti-50.7 at.% Ni, as an austenitic layer, and Ti-45 at% Ni-5 at% Cu, as a martensitic layer, are produced by the vacuum arc remelting technique. The tensile behavior of single-and bi-layers is investigated by using loadingunloading experiments to find the nominal stress-strain curves. Numerical simulations are also done by employing Lagoudas constitutive model to simulate stress-strain diagrams. The solutions of the analytical method presented are validated by using the numerical simulations as well as the experimental results. With regard to the results obtained from the analytical modeling, the numerical simulations, and the experiments, it is evident that the bi-layer composites with different thickness ratios provide adjustable mechanical behavior that can be considered in different application designs, for example, actuators equipped with shape memory components.

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Local composition and microstructure control for multiple pseudoelastic plateau and hybrid self-biasing shape memory alloys

Cited by 14 publications

References 46 publications

Process Parameter Optimization of Extrusion-Based 3D Metal Printing Utilizing PW–LDPE–SA Binder System

Process Parameter Optimization of Extrusion-Based 3D Metal Printing Utilizing PW–LDPE–SA Binder System

Effects of post-processing on the thermomechanical fatigue properties of laser modified NiTi

A Combined Analytic, Numeric, and Experimental Investigation Performed on NiTi/NiTiCu Bi‐Layer Composites under Tensile Loading

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