3D thixo-printing: A novel approach for additive manufacturing of biodegradable Mg-Zn alloys

Author(s)

Lima, Dalton Daniel ; Campo, Kaio Niitsu ; Button, Sergio Tonini ; Caram, Rubens

• Document type: Journal article
• Source: MATERIALS & DESIGN; v. 196, p. 9-pg., 2020-11-01.

Abstract

A simple and widely used additive manufacturing technique for polymeric materials is fused filament fabrication (FFF). In the semi-solid state, metallic materials may show rheological features comparable to those of polymers. Thus, they can be processed accordingly. The use of biodegradable Mg-based materials is an interesting approach to avoid removal surgeries and release of toxic corrosion products and wear debris. Therefore, in this study, the FFF technique was applied using a biodegradable Mg-Zn alloy in the semi-solid state. Some preliminary compositions were investigated through thermodynamic simulations to verify their compatibility with the process. Among them, Mg-38Zn was selected to be experimentally evaluated. Metallic filaments were produced via hot extrusion, which also aided in obtaining a globular microstructure in the semi-solid state. FFF was performed at 420 degrees C without any obstruction at the nozzle channel, which allowed the production of sound parts with acceptable welding between the deposited layers. This indicated that this technique (termed as "3D thixoprinting") provides a promising additive manufacturing route to produce biodegradable Mg-based implants. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/). (AU)

• FAPESP's process: 18/10190-5 - Design and Semisolid Processing of High-Entropy Alloys Based on the CrCuFeMnNi System
• Grantee: Kaio Niitsu Campo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral