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(1) Presentation(s)

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Jeu. 27/05/2021 14:00 en Visio

Séminaire
BENN Felix (Queen's University - Belfast (Royaume-Uni))
Additive Manufacturing of Magnesium Alloys

Sommaire:

Magnesium (Mg) is one of the lightest structural metal materials, 33 % lighter than Aluminium. Due to its low density and high strength, its alloys are widely used in the automobile industry, electronics, aerospace, and other important fields. Additionally, biocompatible Mg alloys have emerged as a promising degradable biomaterial for use in orthopaedics and cardiology. The primary advantage of Mg is that long term complications can be minimized or avoided because the device completely degrades inside the human body, thus a second removal surgery is not necessary. At present, several degradable Mg-based orthopaedic devices are certified within the European Union. Manufacturing of those devices is commonly performed by conventional processing, such as casting, extruding, machining, milling and post-processing.
The process of additive manufacturing (AM) for orthopaedic devices was first established in 2007 in the EU with a customised Titanium porous structured implant based on the acetabular cup of a patient. Due to high accuracy and low dimensional tolerances as well as process stability, the Laser Powder Bed Fusion (LPBF) was favourable for medical applications and it since established as new standard for additive manufacturing of metallic implants. Currently, several research groups are focusing on enabling AM with Mg alloys for biomedical applications.
The presentation is giving insights into the challenging process of LPBF with highly reactive Mg alloys. The main challenging factors of powder analysis, process parameter finding, security standards for Mg and analytical methods are presented. Additionally, the assessment of in-vitro degradation behaviour for Mg is discussed and results from past studies are presented.


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