Microstructure evolution during FSW/FSP of high strength aluminum alloys

作者：Su JQ^*; Nelson TW; Sterling CJ

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2005, 405(1-2): 277-286.

DOI：10.1016/j.msea.2005.06.009

• friction stir welding
• friction stir processing
• dynamic recrystallization
• microstructure
• aluminum alloys

Microstructural characteristics of friction stir processed (FSP) 7075 Al samples in different regions behind the pin tool were investigated. Furthermore, the microstructure evolutions during friction stir welding (FSW)/FSP has been revealed. Multi-mechanisms, including dDRX, grain growth, dislocation introduction, dynamic recovery (DRV) and cDRX, were found to be inherent in the process at different stages. Because inhomogeneous plastic deformation was introduced by the process, individual grains in the final microstructure have undergone different evolution mechanisms. These are either from growth of initially recrystallized grains or are the result of cDRX of subgrains formed during DRV. Grains within the processed region exhibit different densities of dislocations and are in various degrees of recovery.

• 出版日期2005-9-25