These proceedings address recent progress in theoretical and experimental studies of hot deformation of aluminum alloys. Technical papers from fundamental research and industrial applications cover such topics as hot deformation mechanisms, evolution of grain structure, texture, precipitates, and damage in thermomechanical processes including rolling, extrusion, forging, superplastic forming, friction stir welding, severe plastic deformation forming, hydroforming, and semi-solid forming. The design and optimization of thermomechanical processes and microstructure using fundamental understanding, development of models, and computer simulation are also addressed. A collection of papers from the 2003 TMS Annual Meeting and Exhibition, which was held in San Diego, California, March 2-6, 2003.