Evaluation of corrosion resistance and high temperature oxidation of Ni-Nb-M based alloys system.

• Grant number: 22/16642-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: February 01, 2023
• End date: January 31, 2024
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Conrado Ramos Moreira Afonso
• Grantee: Rafael dos Reis Sobczak
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

This work will study the microstructure and microhardness of a set of ternary Ni-Nb-M (M = Al, Ti, Cr, Fe) alloys, rapidly solidified by copper mold casting. The samples will be manufactured in a vacuum arc furnace in an argon gas atmosphere, using elements of high purity (99.9% Nb and 99.9% Ni) combined with the commercial Ni-alloy Ni-65%Nb donated by CBMM company. These alloys will be based on a previous study of Ni-xNb-M binary alloys, as there is still a gap in the literature to be explored regarding the microstructure and high temperature oxidation resistance of Ni-Nb-M alloys system (M= Al, Cr, Fe). The samples will be characterized by: X-ray diffraction (XRD), optical microscopy (MO), scanning electron microscopy (SEM) coupled to EDS (X-ray dispersive energy spectroscopy), thermal analysis (DSC and TG), high temperature oxidation test (exposed to air), as well Vickers microhardness mesaurements. This research will have collaborations from research groups in relation to the theme to be developed and will also be associated with the possibility of establishing a new line of research in DEMa /UFSCar, that of Ni-Nb based superalloys. The characterization of these alloys will be facilitated by the infrastructure offered by the Metals Labs and Structural Characterization Laboratory (LCE) in conjunction with research laboratories from DEMa/UFSCar and the group on Nanocrystalline Metallic Alloys. It is expected to obtain clearer and more isolated responses of the effects of each alloying element in the high temperature oxidation resistance of the ternary Ni-Nb-M alloys.