Seminar: Age Softening Behavior in AA5182
Seminar by Dr. John Carsley
Principal Scientist and R&D Manager
AA5182 is a commonly used material in the beverage can industry for lid fabrication. As with any Al-Mg alloy in the 5xxx series, the post-deformation microstructure is not completely stable, which allows slow internal structural relaxation of the stress state over time, even at room temperature. Such relaxation can result in loss of buckle strength of the formed can end. In this work, we present understanding of the low temperature softening mechanisms in various Al-Mg alloys in terms of the transient nature of the heavily deformed 5xxx microstructure by analyzing the stress relaxation data and correlating with evolution of the dislocation substructure. High resolution EBSD, TEM and X-ray line profile analyses were used to characterize the deformed microstructure. The evolution of softening is addressed by the interaction of Mg atoms with the mobile and forest dislocations.
Dr. John Carsley is Principal Scientist and R&D Manager of metallurgical research in the Materials Technology group at Novelis, Inc. in Kennesaw Georgia. He manages a group of metallurgists working on scientific projects to support business interests in aluminum flat rolled products. Dr. Carsley previously worked 22 years in automotive research developing lightweighting technologies for vehicle body and structure components. He has been awarded 27 U.S. patents, published more than 65 scholarly articles that exceed 1400 citations, and received a Ph.D. in Metallurgical and Materials Engineering at Michigan Technological University.