p asadi - university of tehran
r mahdavinejad
m.k besharati givi
r salek rostam

friction stir processing which is based on friction stir welding is a solid state processing to improve microstructure and mechanical properties of sheets and as-cast metals. By using this technique it is possible to produce a composite layer on various metals one of the important problems in friction stir processing of AZ91 magnesium alloy is creation of the longitudinal cracks and tunneling cavities throughout the processing path due to lack of heat production in the processing zone whereas magnesium by hexagonal close packed HCP structure is a brittle metal whereby in low temperatures has brittle fracture and is a very sensitive to the temperature. in the present study temperature variations in different points of the side of the processing path in the friction stir processed sample obtained by using a five sensory thermocouple and the temperature variation curve was derived.

FSW,FSP,magnesium alloy,surface treatment