Effect of the surface morphology of solidified droplet on remelting between neighboring aluminum droplets

Yi, Hao; Qi, Lehua; Luo, Jian; Zhang, Daicong; Li, Hejun; Hou, Xianghui

doi:10.1016/j.ijmachtools.2018.03.006

Cited by 86 publications

(20 citation statements)

References 28 publications

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“…Droplet‐based 3D printing, either piezoelectrically or pneumatically driven, is an example of the aforementioned techniques, which has recently gained attention. Its research and results on aluminum alloy printing have showcased good‐quality droplet printing, of μm resolution, rendering the technique viable for numerous applications in the field of electronic components and flexible circuits . Another very promising direct printing technique, with numerous demonstrations in LAE, is laser‐induced forward transfer (LIFT), in which a pulsed laser is used to eject material coated on a transparent donor substrate toward a desired receiver substrate.…”

Section: Introductionmentioning

confidence: 99%

Laser‐Induced Forward Transfer of High Viscous, Non‐Newtonian Silver Nanoparticle Inks: Jet Dynamics and Temporal Evolution of the Printed Droplet Study

et al. 2019

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Current technological trends in the field of microelectronics highlight the requirement to use cost-effective techniques for precise deposition of highly resolved features. Laser-induced forward transfer (LIFT) meets these requirements and is already applied for direct printing of electronic components. However, to improve the process' reproducibility and printing resolution, further research has to be conducted, regarding the rheological characteristics of the printable fluids and their jetting dynamics. Herein, a high-speed imaging setup is used to investigate the liquid jet's propagation during the printing process. Different Ag nanoparticle inks are studied and compared, over a wide range of viscosities and two different values of surface tension. The main focus of this investigation is the influence of the ink's rheological properties, both on the jet propagation and on the spatial and temporal evolution of the printed droplet during the wetting phase on three different receiver substrates (glass, SU-8, and gate dielectric). The results indicate that both the surface tension and the wetting properties of the receiver determine the shape of the printed droplet, whereas the inks' viscosity and laser fluence determine the printed volume.

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Section: Introductionmentioning

confidence: 99%

Laser‐Induced Forward Transfer of High Viscous, Non‐Newtonian Silver Nanoparticle Inks: Jet Dynamics and Temporal Evolution of the Printed Droplet Study

et al. 2019

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“…In addition, a strong shock wave could be induced by high laser power, which caused the molten pool to splash during the melting process of the powder to lead to spheroidization and decreased the density. 23 Yi et al 24 found the similar results during investigation of deposition of liquid aluminum. It was found that too low or too high laser energy may cause cold laps between powders, which induced pores in the samples.…”

Section: Resultsmentioning

confidence: 63%

Investigation of mechanical properties and microstructures of GH536 fabricated by laser powder bed fusion additive manufacturing

Ren

Lü

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser powder bed fusion additive manufacturing of superalloys has received increasing attention in these years. In this article, the influence of parameters of laser powder bed fusion on mechanical properties and microstructures of nickel-based superalloy GH536 was investigated. Influence of laser power, scanning speed, hatch space and building direction on mechanical properties was discussed, and the optimal parameters were obtained. The relative density of samples fabricated by laser powder bed fusion could be as high as 99.5%. The processing window of laser energy density with 8.56 × 104–1.15 × 105 J/cm3 should be employed to make sure that the relative density is higher than 98%. The ultimate tensile strength and yield stress of GH536 sample made by laser powder bed fusion were 950 and 606 MPa, respectively, which were superior to samples with the tensile strength of 767 MPa and yield strength of 379 MPa prepared by traditional hot forging method. The hardness of the sample could reach 316.8 HV.

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“…These metal matrix composites are commonly designed to enhance performance, often with reduced weight, in structural, wear, and thermal management applications for space, aviation, automotive, mining, power generation and other industries [5,6]. Additive manufacturing techniques have been used to fabricate different metal matrix composites and functionally graded materials using materials in the form of pre-blended and preplaced powder [7], a wire-powder system [8], a powder-melt injection/blown system [9] and direct metal droplet [10]. In powder blown system, monolithic or pre-blended/simply mixed powders are continuously injected into an energy generated melt pool to fabricate part on a programmable substrate, while in wire-powder system, the materials required for fabrication of part are fed into the melt pool in the form of wire and powder, to manipulate the composition of the part.…”

Section: Introductionmentioning

confidence: 99%

Development of metal matrix composites by direct energy deposition of ‘satellited’ powders

Farayibi

Abioye

Kennedy

et al. 2019

Journal of Manufacturing Processes

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Limited research has been undertaken investigating the material design freedoms that are granted through the use of additive manufacturing methods, especially the development of materials specifically formulated for additive processes. In this study, a new material combination was evaluated for use with directed energy deposition methods. Here, a Ti-6Al-4V powder is processed in combination with a much finer titanium diboride powder following a satelliting procedure. The resulting combination consists of large Ti-6Al-4V particles encased in finer titanium diboride. Deposited composites exhibit TiB needles associated with increased hardness. Processing conditions are detailed which permit the deposition of the prepared feedstock onto Ti-6Al-4V substrates. Microstructural characterisation revealed that the composite was made up of eutectic TiB precipitates dispersed in α-β Ti matrix with few partially melted Ti-6Al-4V and TiB2 particles. Satelliting TiB2 powder onto Ti-6Al-4V particle surfaces has significantly improved the homogeneity of composite which is characterised with randomly oriented and uniform distribution of TiB needles in the microstructure. Hardness of composites ranged between 440-480 HV. Hence, the feedstock preparation method proposed has been found to be effective and can be adapted for low cost and rapid formulation of a host of materials for processing by additive manufacture.

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Effect of the surface morphology of solidified droplet on remelting between neighboring aluminum droplets

Cited by 86 publications

References 28 publications

Laser‐Induced Forward Transfer of High Viscous, Non‐Newtonian Silver Nanoparticle Inks: Jet Dynamics and Temporal Evolution of the Printed Droplet Study

Laser‐Induced Forward Transfer of High Viscous, Non‐Newtonian Silver Nanoparticle Inks: Jet Dynamics and Temporal Evolution of the Printed Droplet Study

Investigation of mechanical properties and microstructures of GH536 fabricated by laser powder bed fusion additive manufacturing

Development of metal matrix composites by direct energy deposition of ‘satellited’ powders

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