Microstructural and localized corrosion resistance characterization of base metal and welding zones of AA2050 aluminum alloy welded by friction stir welding(FSW)

• Grant number: 17/05898-6
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): June 01, 2017
• Effective date (End): May 31, 2018
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Hercílio Gomes de Melo
• Grantee: Wander da Cunha Junior
• Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 13/13235-6 - Investigation on the localized corrosion and the fatigue corrosion resistance of high strength aluminum alloys joined by friction stir welding (FSW), AP.TEM

Abstract

AA2050 aluminum alloy is an aluminum, lithium and copper alloy developed in the latest decades of the past century. Due to its great properties, such as, lower density, higher modulus of elasticity (proportional of the amount of lithium), strength and toughness and good corrosion resistance, this alloy is considered, by specialists, as a natural successor of the nowadays most common alloys in industry, such as, AA7050 and AA7075. This research consists on the characterization of the microstructure of the AA2050 alloy matrix and of the weld core region (weld bead) by metallographic and microscopic techniques, pitting corrosion resistance on these two zones and the establishment of the correlation between corrosion and microstructure of the studied regions.