Date of Award
Open Access Master's Thesis
Master of Science in Materials Science and Engineering (MS)
Administrative Home Department
Department of Materials Science and Engineering
Committee Member 1
Committee Member 2
The extrusion process involves high temperatures and strains that can result in undesirable microstructures, especially along the surface. Extruded alloys tend to exhibit surface recrystallization during heat treating at regions of higher strains, which can lead to reduced fatigue strength and corrosion resistance. By adding Sc to AA7050, nano-sized dispersoids are formed with Sc cores and Zr shells that restrict recrystallization more than the base alloy that only utilizes Zr. Billets with varying Sc content and a control with only Zr were cast, and extrusions were made in order to compare surface microstructures at varying strains in the as-extruded and varied heat treated conditions. The billet with the highest Sc content showed the greatest resistance to recrystallization, while even small amounts of Sc resisted recrystallization better than the non-Sc containing alloy at high strains.
Schmidt, Keaton, "EFFECT OF SC ON RECRYSTALLIZATION RESISTANCE OF AA7050", Open Access Master's Thesis, Michigan Technological University, 2023.