Characterization of extruded (La0.5Ce0.5)60Al15Co25 metallic glass

• Grant number: 19/02322-1
• Support type: Scholarships abroad - Research Internship - Scientific Initiation
• Effective date (Start): April 01, 2019
• Effective date (End): July 31, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Piter Gargarella
• Grantee: Maria Clara Farah Antunes Vilas Bôas
• Supervisor abroad: Jurgen Hartmut Eckert
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Local de pesquisa : Montanuniversität Leoben, Austria
• Associated to the scholarship: 17/16588-8 - Hot extrusion and characterization of (La0,5Ce0,5)60Al15Co25 metallic glass, BP.IC

Abstract

Metallic glasses exhibit high mechanical strength (closer to theoretical limits) and high corrosion resistance and they are used in applications as sensors, flowmeters, parts with small size in watches and miniature motors, in transformers cores and coatings. Extrusion is a process used to fabricate different metallic glasses profiles as gears and tubes and also to consolidate powder and ribbons. Expensive devices with limited temperature control are usually used to extrude metallic glasses, which may limit the extrusion of ¼m-sized samples. The aim of this undergraduation scientific initiation research project is to investigate the use of a Fused Deposition Modeling (FDM) machine, a low cost 3D printing device used to print parts of thermoplastic polymers, to make microextrusion of (La0,5Ce0,5)60Al15Co25 metallic glass. This is a very simple and inexpensive equipment that could open up several possibilities for the extrusion of metallic glasses without the need to purchase expensive and more complex equipment. The student used this device to extrude ¼m-sized samples of (La0.5Ce0.5)60Al15Co25 metallic glass under different extrusion ratios and extruded profiles and the samples will be characterized by standard techniques as X-ray diffraction (XRD), Scanning and Transmission Electron Microscopy (SEM and TEM) and Differential Scanning Calorimetry (DSC). Because of the small size, it was not possible to perform XRD measurements using the devices available at DEMa/UFSCar. It was also not possible to prepare TEM samples adequately from different regions of the extruded materials using the available devices. The aim of this BEPE research internship abroad will be to perform these XRD analyses and Focused Ion Beam (FIB) preparation of samples for TEM characterization at the Erich Schmid lnstitute of Materials Science in Leoben/Austria under supervision of Prof. Dr. Jürgen Eckert. The internship will be very important to improve the quality of the results obtained during the scientific initiation and to improve the student's training in the different materials characterization techniques.