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MA04.11.39 : Optimization of Printing Parameters for AZ91D Magnesium Alloy

5:00 PM–7:00 PM Apr 5, 2018

PCC North, 300 Level, Exhibit Hall C-E

Description
David Martinez Holguin1 Namsoo Kim1

1, University of Texas at El Paso, El Paso, Texas, United States

As progress on Aditive Manufacturing (AM) techniques focusing on ceramics and polymers evolve, metals continue to be a challenging material to manipulate when fabricating products. Current methods, such as Selective Laser Sintering (SLS) and Electron Beam Melting (EBM) face many intrinsic limitations due to the nature of their processes. Material selection, elevated cost and low deposition rates are some of the barriers to considere when one of these methods is to be used for the fabrication of engineering elements. The research here presented shows the use of Wire-Feed Plasma Arc 3D printing system for the manufacturing of metallic elements. Due its low cost and versatility, different materiasl, such as Stainless Steel, Aluminum alloys, and Magnesium alloys have been successfully printed in the form of base lines. The main focus of this project is to explore the feasibility of the fabrication of elements made out of Magnesium alloys capable of being used for Biomedical applications. It is known that the elastic modulus of magnesium (41-45 GPa) is more similar of that of natural bone (3-20 GPa) comparing with other metals. Thus, phenomenon like stress shielding can be avoided. Also, the decomposition of Magnesium inside the human body represents no harm for organism, since it is an essential element in the body and decomposition products can be easily excreted by the urine. Despite magnesium alloys exhibit good biocompatibility and structural stability that makes them suitable for bone fracture healing, corrosion rates of these materials inside the human body are faster than the required in order to ensure proper bone healing. In order to reduce the corrosion rate, the elimination of voids and impurities inside the finished product must be ensured. The research here presented shows the characterization of single printed lines using AZ91D as filler under different conditions, such as heat and printing speed, in order to determine the best parameter for its further use in the fabrication of larger structures.

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