Microstructure and micro-hardness of Zn-5Al alloy in equal angular channel processes were observed.Firstly

grain was drawn to wear out the ribbon structure

and the dislocation cell was formed by reaction of the ribbon structure with tangle dislocation in grain.Further

dislocation in the cell was deformed to form three dimensional grain boundary to create sub-crystal boundary with small angle and grain boundary with large angle

resulting in the refinement of the microstructure in equal angular channel process.TEM determination indicated that microstructure of the Zn-5Al alloy was refined

average grain size lower than 10μm

and Vickes hardness increases from 72.5 to 83.8 after seven times of deformation at 150 ℃.