Abstract: In order to investigate the effect of different processing routes for the equa-l channel angular pressing （ECAP） on the microstructure and property of magnesium alloy, AZ31Mg alloy was prepared by means of ECAP in the die, with an intersecting angle （φ） of 120°and four processing routes of A, BA, BC, C, respectively．The microstructure and property of the pressed material at room temperature were then measured and analyzed．The results indicate that, compared with those pressed via A, BA, C routes, the workpiece pressed via BC route can be pressed with more passes and has a greater deformation．It is also indicated that, after a mult-i pass pressing, the grains of the alloy are significantly fined and the mechanical property improves greatly, and different routes have various effects on the microstructure and property．With a pressing pass number of12, the materials pressed via BC and BA routes are of a greatly improved ductility and a significantly lowered yield strength, while for those pressed via A and C routes, the ductility improves slightly with little change in the yield strength.

Key words: equal channel angular pressing, processing route, magnesium alloy, microstructure, mechanical property