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conference presentation

Magnetic Field-Assisted Direct Liquid Metal Deposition

Gheysen, Julie  
•
Le Bas, William  
•
Benkley, Tyler John-Anselme  
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September 4, 2024
The 2024 edition of Alloys for Additive Manufacturing Symposium

Common metal additive manufacturing technologies require intensive energy sources such as lasers to achieve the melting and bonding of a metallic feedstock. This leads to a sizeable carbon footprint especially for reflective materials such as aluminium. Moreover, it induces complex and turbulent melt pool dynamics leading to stochastic defect formation mechanisms that are hence difficult to suppress. We aim to propose an alternative approach similar to what is now practised on a large scale with thermoplastic polymers, i.e., Fused Deposition Modelling. In our technology, a metallic wire is fed through a nozzle and melted using traditional resistive heating. It then exits the nozzle producing a small meniscus before bonding and solidifying onto the previous deposited layer. This is especially challenging for metallic materials due to their combination of low viscosity, high capillary forces which induce instabilities such as bulging, and their propensity for chemical reaction, in particular with air. To achieve our goal, we explore the benefits of the application of a static magnetic field on the meniscus in order to overcome these issues. It does indeed give rise to visible effects on fluid flow and the development of bulging through the interplay between magnetic field, metal flow and the Seebeck effect, known to generate a current in the vicinity of a solidification front. The current project state will be presented, with a focus on the influence of the process parameters on the physics of direct melt deposition including mechanisms of defect development or suppression, such as the bulging instability.

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Type
conference presentation
Author(s)
Gheysen, Julie  

EPFL

Le Bas, William  

EPFL

Benkley, Tyler John-Anselme  

EPFL

You, Xiaojiao  

EPFL

Charvet, Raphaël  

EPFL

Dénéréaz, Cyril  

EPFL

Vogt, Cyril  

EPFL

Mortensen, Andreas  

EPFL

Date Issued

2024-09-04

Subjects

direct liquid metal deposition

•

magnetic field

•

aluminium alloys

Written at

EPFL

EPFL units
LMM  
Event nameEvent acronymEvent placeEvent date
The 2024 edition of Alloys for Additive Manufacturing Symposium

AAMS2024

Paris, France

2024-09-04 - 2024-09-06

FunderFunding(s)Grant NumberGrant URL

Swiss National Science Foundation

Harnessing Melt Pool Dynamics i n Additive Manufacturing

TMAG-2 209328

Available on Infoscience
September 23, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/241354
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