Abstract
Friction stir welding(FSW)is a solid state bonding method developed in The Welding Institute(TWI)of the United Kingdom(UK)in 1991. Friction stir welding technique possesses a lot of features such as the formation of a fine-grained microstructure in the welded zone. Therefore, the friction stir welding process is expected to be a microstructure refinement method for crystalline materials. 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). We have applied this joining method to 7075-T6 alloy as a microstructure control method. It was found that initial microstructure was altered considerably by the process;in particular, grains in stirred zone were refined to very fine and equiaxial ones. We discussed a probable mechanism of the microstructure evolution with the present experimental results.
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