Microstructure of selective laser melted nickel–titanium

Bormann, Therese; Müller, Bert; Schinhammer, Michael; Keßler, Anja; Thalmann, Peter; Wild, Michael de

doi:10.1016/j.matchar.2014.05.017

Cited by 197 publications

(139 citation statements)

References 38 publications

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“…The 2.5 × 2.5 × 1 mm samples heated and cooled at a rate of 10 °C/s. Optical microscopy were conducted on samples prepared by mechanical polishing with a final step of 0.05 μm colloidal silica, followed by electropolishing in 3 M H 2 SO 4 in 1:1 ethanol–methanol solution at 20 °C and voltage of 20 V8. A final color-etching step is then conducted in a solution containing 120 mL deionized water, 15 mL 1 M HCl (Sigma-Aldrich), 15 g Na 2 S 2 O 5 (Sigma-Aldrich), 10 g K 2 S 2 O 5 (Sigma-Aldrich), and 2 g NH 4 HF (Alfa-Aesar) following the work of Bormann et al 8…”

Section: Experimental Methodsmentioning

confidence: 99%

Spatial Control of Functional Response in 4D-Printed Active Metallic Structures

Franco

Tapia

et al. 2017

Sci Rep

133

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We demonstrate a method to achieve local control of 3-dimensional thermal history in a metallic alloy, which resulted in designed spatial variations in its functional response. A nickel-titanium shape memory alloy part was created with multiple shape-recovery stages activated at different temperatures using the selective laser melting technique. The multi-stage transformation originates from differences in thermal history, and thus the precipitate structure, at various locations created from controlled variations in the hatch distance within the same part. This is a first example of precision location-dependent control of thermal history in alloys beyond the surface, and utilizes additive manufacturing techniques as a tool to create materials with novel functional response that is difficult to achieve through conventional methods.

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Section: Experimental Methodsmentioning

confidence: 99%

Spatial Control of Functional Response in 4D-Printed Active Metallic Structures

Franco

Tapia

et al. 2017

Sci Rep

133

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“…[54] The sliced model facilitates the layer-wise generation, however, not yet the fabrication with a highly focused energy source. [36,[55][56][57][58][59][60][61][62][63] The main distinctions amongst these is the approach of dividing the cross-section to be irradiated into smaller subsections and their subsequent scanning order. The division of the slices into single scan tracks, including their arrangement and the subsequent irradiation sequence, is commonly named scan strategy or irradiation pattern.…”

Section: Manufacture Schematamentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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Additive manufacturing has multiple advantages over conventional fabrication techniques, such as the geometrical freedom and, to a great extent, the omission of tooling equipment. Hence, futuristic designs and non-standard topology-optimized structures can be fabricated without causing noteworthy extra cost, since the geometrical complexity is, exaggeratedly spoken, for free. The manufacturing time and the amount of required raw material are the key criteria, which determine the expenses. What at first glance appears as an engineer's dream, introduces its complexity in the description of the material's characteristics and their volatility to the manufacturing conditions. Within this study, the main properties (i.e., surface hardness, tensile, and compression strength, as well as fracture toughness) and their anisotropic and inhomogeneous nature are addressed. Detailed overviews of the progress to date for aluminum, iron, titanium, cobalt, and nickel based raw materials are provided. Furthermore, an overview about the state-of-the-art in the medical sector is included, comprising the areas of utilization and several trail studies.

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“…Previous process optimisation studies identified an optimum LPBF energy density window of ~52-83 J/mm 3 [15][16][17][18], but that was mainly for solid and Ni-rich TiNi-alloys, which as such may be not suitable for LPBF of Ti-rich TiNi lattice structures. When fabricating lattices by LPBF, the laser exposure area in each layer is mostly made up of single laser tracks and is significantly reduced, compared with fabricating solid/bulk structures.…”

Section: Introductionmentioning

confidence: 99%

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Tan

Essa

et al. 2019

International Journal of Machine Tools and Manufacture

118

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Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Microstructure of selective laser melted nickel–titanium

Cited by 197 publications

References 38 publications

Spatial Control of Functional Response in 4D-Printed Active Metallic Structures

Spatial Control of Functional Response in 4D-Printed Active Metallic Structures

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

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