Laser additive manufacturing of bulk and porous shape-memory NiTi alloys: From processes to potential biomedical applications

Dadbakhsh, Sasan; Speirs, Mathew; Humbeeck, Jan Van; Kruth, Jean‐Pierre

doi:10.1557/mrs.2016.209

Cited by 146 publications

(73 citation statements)

References 74 publications

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“…low elastic modulus, biocompatibility [1,2], mechanical strength, and excellent corrosion and wear resistance [3,4]). They have been employed in biomedical implants and devices [5], aerospace components [6], and functional devices [7]. TiNi components are typically processed via casting, powder metallurgy (PM), wire drawing, and machining [5,8].…”

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

110

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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

110

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“…[28] Additive manufacturing, also known as three-dimensional (3D) printing, allows the highest freedom in terms of shape design among various manufacturing techniques, and it can enable customization of SMAs. [29,30] Broadly speaking, casting and powder metallurgy are two categories of manufacturing techniques for SMAs, and additive manufacturing is in the category of powder metallurgy. [30,31] The casting technique utilizes arc or induction melting under vacuum followed by metal forming and machining to achieve final shapes, while powder metallurgy employs powders as starting materials and undertakes consolidation processes such as sintering at near melting temperatures to produce near-net-shape components.…”

Section: Introductionmentioning

confidence: 99%

Elastocaloric cooling of additive manufactured shape memory alloys with large latent heat

Hou¹,

Simsek²,

Stasak³

et al. 2017

J. Phys. D: Appl. Phys.

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The stress-induced martensitic phase transformation of shape memory alloys (SMAs) is the basis for elastocaloric cooling. Here we employ additive manufacturing to fabricate TiNi SMAs, and demonstrate compressive elastocaloric cooling in the TiNi rods with transformation latent heat as large as 20 J g −1 . Adiabatic compression on as-fabricated TiNi displays cooling DT as high as −7.5 °C with recoverable superelastic strain up to 5 %. Unlike conventional SMAs, additive manufactured TiNi SMAs exhibit linear superelasticity with narrow hysteresis in stress-strain curves under both adiabatic and isothermal conditions. Microstructurally, we find that there are Ti 2 Ni precipitates typically one micron in size with a large aspect ratio enclosing the TiNi matrix. A stress transfer mechanism between reversible phase transformation in the TiNi matrix and mechanical deformation in Ti 2 Ni precipitates is believed to be the origin of the unique superelasticity behavior. Abstract:The stress-induced martensitic phase transformation of shape memory alloys (SMAs) is the basis for elastocaloric cooling. Here we employ additive manufacturing to fabricate TiNi SMAs, and demonstrate compressive elastocaloric cooling in the TiNi rods with transformation latent heat as large as 20 J g −1 . Adiabatic compression on as-fabricated TiNi displays cooling ∆T as high as −7.5 °C with recoverable superelastic strain up to 5 %. Unlike conventional SMAs, additive manufactured TiNi SMAs exhibit linear superelasticity with narrow hysteresis in stress-strain curves under both adiabatic and isothermal conditions. Microstructurally, we find that there are Ti2Ni precipitates typically one micron in size with a large aspect ratio enclosing the TiNi matrix.A stress transfer mechanism between reversible phase transformation in the TiNi matrix and mechanical deformation in Ti2Ni precipitates is believed to be the origin of the unique superelasticity behavior.

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“…), the processing parameters such as laser power ( P ), scan speed ( v ), hatch spacing ( h ), scanning pattern, powder layer thickness ( t ), and beam spot diameter ( d ) affect the final quality of the manufactured parts. To sum the influences of the processing parameters, they are commonly combined in an engineering parameter called volumetric laser energy density ( E ), as shown in Equation (for SLM):

E_{S L M} = P / v ht

…”

Section: Mmcs From Conventional Techniques To Powder Additive Manufacmentioning

confidence: 99%

Selective Laser Melting to Manufacture “In Situ” Metal Matrix Composites: A Review

et al. 2019

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After a brief introduction on selective laser melting (SLM) and "ex situ" manufacture of metal matrix composites (MMCs), this paper reviews the capacities and benefits of SLM to activate and control various "in situ" reactions during fabrication of 3D parts. It introduces several systems (such as etc.) used to manufacture Al-based, Ti-based, and steel-based "in situ" MMCs. Then, it illustrates the novel microstructural characteristics of these SLM-made "in situ" MMCs for different cases, as they may appear from nano-particles to nano-whiskers and dendritic reinforcements homogeneously distributed in a metal matrix. It also focuses on SLM associated "in situ" mechanisms, explaining how an "in situ" reaction propagates based on "decomposition, diffusion, and reformation" and how the growth mechanisms turn into different morphologies such as rounded particles, whiskers, or polygonal block shapes. The influence of various SLM parameters (such as energy density, laser power/speed, powder layer thickness, and the size of initial powder particles) and the SLM "in situ" challenges are also discussed.

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Laser additive manufacturing of bulk and porous shape-memory NiTi alloys: From processes to potential biomedical applications

Abstract: Abstract

Cited by 146 publications

References 74 publications

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

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

Elastocaloric cooling of additive manufactured shape memory alloys with large latent heat

Selective Laser Melting to Manufacture “In Situ” Metal Matrix Composites: A Review

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