Mechanical and shape memory properties of porous Ni 50.1 Ti 49.9 alloys manufactured by selective laser melting

Andani, Mohsen Taheri; Saedi, Soheil; Turabi, Ali Sadi; Karamooz, Mohammadreza; Haberland, Christoph; Karaca, H.E.; Elahinia, Mohammad

doi:10.1016/j.jmbbm.2017.01.047

Cited by 145 publications

(53 citation statements)

References 51 publications

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“…The SLM fabricated NiTi parts normally show good mechanical properties under compression. The total compressive strain over 25% [ 60 , 63 , 98 ] and recoverable strain of up to 6% [ 43 ] have been reported, which are comparable to the conventionally fabricated NiTi samples. It was also found that the compressive properties of SLM fabricated NiTi alloys also benefit from aging treatment [ 24 , 70 , 101 ], the effect that is similar to that in NiTi produced by conventional techniques [ 65 , 90 ].…”

Section: Tensile Propertiesmentioning

confidence: 89%

“…Since Ti is very active, pickup of oxygen will occur during SLM of NiTi alloys [ 45 , 47 , 60 ]. The oxygen pickup will lead to the following two effects: (1) binding with Ti (e.g., forming Ti 4 Ni 2 O [ 60 , 61 , 62 ]), resulting in an increase of effective Ni/Ti ratio and thus leading to the decrease of MTTs; (2) influencing significantly the mechanical properties of SLM fabricated NiTi parts. The latter effect depends on the size, morphology, and distribution of the oxides.…”

Section: Microstructurementioning

confidence: 99%

“…Therefore, it is essential to control the oxygen level in the building chamber to improve the repeatability in both the transformation behaviour and functional properties of SLM fabricated NiTi alloys. Many studies have shown that with proper process control (e.g., using the constant fresh argon flow during SLM [ 63 ]), the SLM fabricated NiTi parts show low oxygen content and meet the requirements (<500 ppm) prescribed in the ASTM F 2063 standard (ASTM International, Standard Specification for Wrought Nickel-Titanium Shape Memory Alloys for Medical Devices and Surgical Implants) [ 24 , 60 , 63 , 64 ]. The pickup of carbon and nitrogen also occurs during SLM, as shown in Figure 3 b,c [ 47 ].…”

Section: Microstructurementioning

confidence: 99%

“…Many studies, which were mainly focused on the compression mode, have been conducted to investigate the mechanical properties of SLM fabricated NiTi parts [ 24 , 29 , 43 , 47 , 49 , 60 , 62 , 67 , 68 , 70 , 85 , 95 , 96 , 97 , 98 , 99 ]. The effect of SLM process conditions on the functional properties of NiTi alloys under compression mode has been well studied and summarized, for example in Ref.…”

Section: Tensile Propertiesmentioning

confidence: 99%

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A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting

2018

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Due to unique functional and mechanical properties, NiTi shape memory alloys are one of the most promising metallic functional materials. However, the poor workability limits the extensive utilization of NiTi alloys as components of complex shapes. The emerging additive manufacturing techniques provide high degrees of freedom to fabricate complex structures. A freeform fabrication of complex structures by additive manufacturing combined with the unique functional properties (e.g., shape memory effect and superelasticity) provide great potential for material and structure design, and thus should lead to numerous applications. In this review, the unique microstructure that is generated by selective laser melting (SLM) is discussed first. Afterwards, the previously reported transformation behavior and mechanical properties of NiTi alloys produced under various SLM conditions are summarized.

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Section: Tensile Propertiesmentioning

confidence: 89%

Section: Microstructurementioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

Section: Tensile Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting

2018

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“…Thermomechanical properties of Ni50.1Ti from [41] were used for tuning the UMAT mentioned above. Followed by preparing the FE model, the uniaxial tensile test of the bone fixation plates was simulated.…”

Section: Modelingmentioning

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

Self Cite

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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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Orthopedic Implant Design and Analysis: Potential of3D/4DBioprinting

Wang

Hazlehurst²

2018

3D and 4D Printing in Biomedical Applications

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Mechanical and shape memory properties of porous Ni 50.1 Ti 49.9 alloys manufactured by selective laser melting

Cited by 145 publications

References 51 publications

A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting

A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting

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

Orthopedic Implant Design and Analysis: Potential of3D/4DBioprinting

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