MSE Colloquium: Dr. Rajeev Gupta, Corrosion and Strength of High-Energy Ball Milled Al Alloys
Development of high strength, lightweight and corrosion resistant alloys is critical to meet the current demand of increasing the fuel efficiency and decreasing carbon emission. The strength and corrosion resistance of engineering alloys is limited by the conventional compositions, production and processing technologies. To realize the full potential of the metallic materials and increase their properties beyond the existing limits a number of challenges related to controlling the microstructure and therefore properties must first be resolved. Fundamental understanding of the influence of the composition and processing on microstructure and properties at nanoscale is key to developing new alloys with improved properties.
Ongoing work in the speaker’s lab has demonstrated that the synthesis of high strength and corrosion resistant Al alloys is possible via combination of suitable alloying elements and production/processing method. Nanocrystalline Al-M (M: Cr, Mo, V, Ti, W, Si, Ge, Ni, Nb, Ta) alloys with high solubility of M in Al were produced by high-energy ball milling followed by consolidation. The high-energy ball milled Al alloys showed significantly high corrosion performance and strength. X-ray photoelectron spectroscopy and electrochemcial methods were used to develop mechanistic understanding of the improved corrosion resistance. Role of nanocrystalline structure and solid solubility of the alloying elements on corrosion resistance and strength of Al will be discussed.
Dr. Rajeev Gupta is an assistant professor in the Department of Chemical & Biomolecular Engineering at the University of Akron, Akron, Ohio. He earned the Ph.D. degree in Materials Engineering from the Monash University, Australia and B.Tech. in Materials & Metallurgical Engineering from the Indian Institute of Technology Kanpur. Prior to joining the University of Akron in November 2014, he was a research fellow at the Monash University, and then a research academic at the Deakin University, Australia. Rajeev’s primary research interests lie in the broad areas of corrosion and material engineering. His research group focuses on understanding the structure/processing/property relationships, corrosion initiation and propagation mechanisms, surface electrochemistry and high temperature oxidation using advanced material characterization and electrochemical techniques. The fundamental research is intended to be applied in developing new alloys, corrosion monitoring techniques, material processing technologies and advanced coatings. Rajeev's research is supported by the NSF, ONR, DOE, ARL, and industries.