Additive Manufacturing of Ni-Rich NiTiHf20: Manufacturability, Composition, Density, and Transformation Behavior

Nematollahi, Mohammadreza; Toker, Guher P.; Saghaian, Sayed Ehsan; Salazar, J.M. Gómez de; Mahtabi, Mohammad J.; Benafan, Othmane; Karaca, H.E.; Elahinia, Mohammad

doi:10.1007/s40830-019-00214-9

Cited by 49 publications

(22 citation statements)

References 31 publications

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“…AM processes are basically the processes that add some materials to the previous surface via different deposition techniques that lead to different part quality, density, and geometrical accuracy [22,23]. The conventional processes are usually subtractive or a combination of several processes in case of complicated parts [24].…”

Section: An Introduction To Ammentioning

confidence: 99%

The Potential of Additive Manufacturing in the Smart Factory Industrial 4.0: A Review

et al. 2019

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Additive manufacturing (AM) or three-dimensional (3D) printing has introduced a novel production method in design, manufacturing, and distribution to end-users. This technology has provided great freedom in design for creating complex components, highly customizable products, and efficient waste minimization. The last industrial revolution, namely industry 4.0, employs the integration of smart manufacturing systems and developed information technologies. Accordingly, AM plays a principal role in industry 4.0 thanks to numerous benefits, such as time and material saving, rapid prototyping, high efficiency, and decentralized production methods. This review paper is to organize a comprehensive study on AM technology and present the latest achievements and industrial applications. Besides that, this paper investigates the sustainability dimensions of the AM process and the added values in economic, social, and environment sections. Finally, the paper concludes by pointing out the future trend of AM in technology, applications, and materials aspects that have the potential to come up with new ideas for the future of AM explorations.

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Section: An Introduction To Ammentioning

confidence: 99%

The Potential of Additive Manufacturing in the Smart Factory Industrial 4.0: A Review

et al. 2019

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“…The size had increased in comparison with the previous case (i.e., the first series of bone fixation plates with larger dimensions). As reported by others [27], as-fabricated SLM fabricated parts could exhibit a geometrical expansion that is related to the laser width, melt pool diameter, and the fact that the part is surrounded by loose powder. The geometrical expansion of SLM-fabricated parts has a more significant effect when the parts include fine details that are close to the laser width.…”

Section: Chemical Polishingmentioning

confidence: 55%

“…Most of the research in this area has been conducted on Ti-6AL-4V plates and/or implants. In recent years, additive manufacturing of NiTi alloys are getting more attention for the fabrication of complex shapes and geometries [26][27][28][29][30]. This is mostly due to the freedom of fabrication and the superior properties of NiTi, as mentioned earlier.…”

Section: Introductionmentioning

confidence: 99%

Design, Modeling, Additive Manufacturing, and Polishing of Stiffness-Modulated Porous Nitinol Bone Fixation Plates Followed by Thermomechanical and Composition Analysis

Jahadakbar

Nematollahi

Safaei

et al. 2020

Metals

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The use of titanium bone fixation plates is considered the standard of care for skeletal reconstructive surgery. Highly stiff titanium bone fixation plates provide immobilization immediately after the surgery. However, after the bone healing stage, they may cause stress shielding and lead to bone resorption and failure of the surgery. Stiffness-modulated or stiffness-matched Nitinol bone fixation plates that are fabricated via additive manufacturing (AM) have been recently introduced by our group as a long-lasting solution for minimizing the stress shielding and the follow-on bone resorption. Up to this point, we have modeled the performance of Nitinol bone fixation plates in mandibular reconstruction surgery and investigated the possibility of fabricating these implants. In this study, for the first time the realistic design of stiffness-modulated Nitinol bone fixation plates is presented. Plates with different levels of stiffness were fabricated, mechanically tested, and used for verifying the design approach. Followed by the design verification, to achieve superelastic bone fixation plates we proposed the use of Ni-rich Nitinol powder for the AM process and updated the models based on that. Superelastic Nitinol bone fixation plates with the extreme level of porosity were fabricated, and a chemical polishing procedure used to remove the un-melted powder was developed using SEM analysis. Thermomechanical evaluation of the polished bone fixation plates verified the desired superelasticity based on finite element (FE) simulations, and the chemical analysis showed good agreement with the ASTM standard.

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“…Very high and low energy densities can result in porosity, thus intermediate energy density levels are recommended for AM of dense parts from many alloys, including NiTi alloys. [59][60][61][62][63][64] Note also that, although a minimum energy is required to achieve dense, defect-free parts, there is discrepancy in the literature regarding the value of this energy. 16,63,65 A first possible reason for this may be differences among different research papers.…”

Section: Porositymentioning

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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Additive Manufacturing of Ni-Rich NiTiHf20: Manufacturability, Composition, Density, and Transformation Behavior

Cited by 49 publications

References 31 publications

The Potential of Additive Manufacturing in the Smart Factory Industrial 4.0: A Review

The Potential of Additive Manufacturing in the Smart Factory Industrial 4.0: A Review

Design, Modeling, Additive Manufacturing, and Polishing of Stiffness-Modulated Porous Nitinol Bone Fixation Plates Followed by Thermomechanical and Composition Analysis

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

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