103 Microstructure Control and Mechanical Properties of 7075-Aluminum Alloy by Means of Friction Stir Processing (FSP)

Abstract

Friction stir welding (FSW) is a kind of solid state bonding method developed in The Welding Institute (TWI), and it is a novel welding method for light metals. It is now well known that FSW'ed zone become equixial and fine-grained microstructure. Therefore, many researchers have been paid attention to this as a microstructure control method for variety of alloys; it is now called Friction Stir Processing (FSP). However, there has been a few reports on FSP applied to the process to large area. Therefore, we have examined 7075 aluminum alloy which was processed by FSP to large area.