|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Grain Boundary Motion, Solute Drag and Precipitation in Al Alloys Processed by SPD
||Xavier Sauvage, Yana Nasedkina, Elena Bobruk, Maxim Murashkin, Nariman Enikeev, Ruslan Valiev
|On-Site Speaker (Planned)
During severe plastic deformation, the creation of crystalline defects along with dynamic recovery processes lead to grain refinement. Solute atoms often have strong interactions with these defects such as dislocations or grain boundaries, and can significantly affect the grain refinement mechanisms. This presentation will focus on some experimental work carried out on the Al-Cu system. Solution treated Al-4Cu and Al-2Cu alloys have been processed by high pressure torsion at different strain level and strain rates. The microstructural characterization was performed by transmission electron microscopy and atom probe tomography. These data clearly revealed an abundant precipitation of Cu rich nanoscaled particles induced by the deformation. Besides, some careful investigations of grain boundaries demonstrated some strong segregation of Cu. The contribution of deformation induced vacancies, of fast solute redistribution along GBs and of solute drag by boundaries moving during SPD will be finally discussed.